CVE-2024-49884

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-49884", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T12:17:06.022Z", "datePublished": "2024-10-21T18:01:21.517Z", "dateUpdated": "2026-10-15T00:53:34.802Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:40:22.502Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix slab-use-after-free in ext4_split_extent_at()\n\nWe hit the following use-after-free:\n\n==================================================================\nBUG: KASAN: slab-use-after-free in ext4_split_extent_at+0xba8/0xcc0\nRead of size 2 at addr ffff88810548ed08 by task kworker/u20:0/40\nCPU: 0 PID: 40 Comm: kworker/u20:0 Not tainted 6.9.0-dirty #724\nCall Trace:\n <TASK>\n kasan_report+0x93/0xc0\n ext4_split_extent_at+0xba8/0xcc0\n ext4_split_extent.isra.0+0x18f/0x500\n ext4_split_convert_extents+0x275/0x750\n ext4_ext_handle_unwritten_extents+0x73e/0x1580\n ext4_ext_map_blocks+0xe20/0x2dc0\n ext4_map_blocks+0x724/0x1700\n ext4_do_writepages+0x12d6/0x2a70\n[...]\n\nAllocated by task 40:\n __kmalloc_noprof+0x1ac/0x480\n ext4_find_extent+0xf3b/0x1e70\n ext4_ext_map_blocks+0x188/0x2dc0\n ext4_map_blocks+0x724/0x1700\n ext4_do_writepages+0x12d6/0x2a70\n[...]\n\nFreed by task 40:\n kfree+0xf1/0x2b0\n ext4_find_extent+0xa71/0x1e70\n ext4_ext_insert_extent+0xa22/0x3260\n ext4_split_extent_at+0x3ef/0xcc0\n ext4_split_extent.isra.0+0x18f/0x500\n ext4_split_convert_extents+0x275/0x750\n ext4_ext_handle_unwritten_extents+0x73e/0x1580\n ext4_ext_map_blocks+0xe20/0x2dc0\n ext4_map_blocks+0x724/0x1700\n ext4_do_writepages+0x12d6/0x2a70\n[...]\n==================================================================\n\nThe flow of issue triggering is as follows:\n\next4_split_extent_at\n path = *ppath\n ext4_ext_insert_extent(ppath)\n ext4_ext_create_new_leaf(ppath)\n ext4_find_extent(orig_path)\n path = *orig_path\n read_extent_tree_block\n // return -ENOMEM or -EIO\n ext4_free_ext_path(path)\n kfree(path)\n *orig_path = NULL\n a. If err is -ENOMEM:\n ext4_ext_dirty(path + path->p_depth)\n // path use-after-free !!!\n b. If err is -EIO and we have EXT_DEBUG defined:\n ext4_ext_show_leaf(path)\n eh = path[depth].p_hdr\n // path also use-after-free !!!\n\nSo when trying to zeroout or fix the extent length, call ext4_find_extent()\nto update the path.\n\nIn addition we use *ppath directly as an ext4_ext_show_leaf() input to\navoid possible use-after-free when EXT_DEBUG is defined, and to avoid\nunnecessary path updates."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is the ext4 extent-splitting path reached through ordinary file I/O (write/fallocate plus writeback) on a locally mounted filesystem. No network protocol handler is involved, so local access to the system is required.\nAC:L - Every precondition is attacker-shaped: the extent-tree depth and fullness are controlled by fragmenting the attacker's own file, writeback is forced on demand with fsync/sync_file_range, and the -ENOMEM that triggers the fallthrough is inducible by an unprivileged task creating memory pressure against GFP_NOFS allocations, which cannot fall back on filesystem reclaim. The reallocation window is widened by the sleeping ext4_ext_zeroout() block I/O on the same code path.\nPR:L - Only an unprivileged local account with write access to any ext4 file (world-writable /tmp or the user's home directory) is needed; no capability, mount privilege, or admin right is checked anywhere along ext4_do_writepages \u2192 ext4_ext_map_blocks \u2192 ext4_split_extent_at.\nUI:N - The attacker operates entirely on files they own and triggers writeback themselves; no victim action, mount of a crafted image, or administrator involvement is required.\nS:U - The use-after-free corrupts kernel slab memory within the same kernel security authority, with no crossing of a VM, IOMMU, or hypervisor boundary.\nC:H - The freed struct ext4_ext_path array lives in a sprayable general kmalloc cache, and the stale p_depth/p_bh fields are dereferenced, so a reallocated object lets the attacker point ext4 at arbitrary kernel addresses and observe results, giving disclosure of arbitrary kernel memory.\nI:H - __ext4_ext_dirty() performs set_buffer_verified() (an arbitrary bit set) and ext4_extent_block_csum_set() (a controlled 4-byte write through a forged buffer_head b_data pointer) on the reallocated object, a classic UAF write primitive usable for control-flow hijack; ext4_ext_zeroout() on the stale extent can additionally zero incorrect on-disk blocks.\nA:H - Even without successful heap grooming the dangling path dereference reliably oopses or panics the kernel in a writeback kworker, as demonstrated by the reported KASAN slab-use-after-free, and it can be retriggered at will."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ext4/extents.c"], "versions": [{"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "393a46f60ea4f249dc9d496d4eb2d542f5e11ade", "status": "affected", "versionType": "git"}, {"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "448100a29395b0c8b4c42967155849fe0fbe808f", "status": "affected", "versionType": "git"}, {"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "e52f933598b781d291b9297e39c463536da0e185", "status": "affected", "versionType": "git"}, {"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "cafcc1bd62934547c76abf46c6d0d54f135006fe", "status": "affected", "versionType": "git"}, {"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "a5401d4c3e2a3d25643c567d26e6de327774a2c9", "status": "affected", "versionType": "git"}, {"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "8fe117790b37c84c651e2bad9efc0e7fda73c0e3", "status": "affected", "versionType": "git"}, {"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "5d949ea75bb529ea6342e83465938a3b0ac51238", "status": "affected", "versionType": "git"}, {"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "915ac3630488af0ca194dc63b86d99802b4f6e18", "status": "affected", "versionType": "git"}, {"version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "c26ab35702f8cd0cdc78f96aa5856bfb77be798f", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ext4/extents.c"], "versions": [{"version": "3.18", "status": "affected"}, {"version": "0", "lessThan": "3.18", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.323", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.290", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.227", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.168", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.113", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.55", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10.14", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11.3", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "4.19.323"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "5.4.290"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", 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"https://git.kernel.org/stable/c/393a46f60ea4f249dc9d496d4eb2d542f5e11ade"}, {"url": "https://git.kernel.org/stable/c/448100a29395b0c8b4c42967155849fe0fbe808f"}, {"url": "https://git.kernel.org/stable/c/e52f933598b781d291b9297e39c463536da0e185"}, {"url": "https://git.kernel.org/stable/c/cafcc1bd62934547c76abf46c6d0d54f135006fe"}, {"url": "https://git.kernel.org/stable/c/a5401d4c3e2a3d25643c567d26e6de327774a2c9"}, {"url": "https://git.kernel.org/stable/c/8fe117790b37c84c651e2bad9efc0e7fda73c0e3"}, {"url": "https://git.kernel.org/stable/c/5d949ea75bb529ea6342e83465938a3b0ac51238"}, {"url": "https://git.kernel.org/stable/c/915ac3630488af0ca194dc63b86d99802b4f6e18"}, {"url": "https://git.kernel.org/stable/c/c26ab35702f8cd0cdc78f96aa5856bfb77be798f"}], "title": "ext4: fix slab-use-after-free in ext4_split_extent_at()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-49884", "role": "CISA Coordinator", "options": 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"V3.1.5", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.0", "lessThan": "V3.1.5", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.0", "lessThan": "V3.1.5", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.0", "lessThan": "V3.1.5", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.0", "lessThan": "V3.1.5", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "RUGGEDCOM RST2428P", "versions": [{"status": "affected", "version": 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No network protocol handler is involved, so local access to the system is required.\nAC:L - Every precondition is attacker-shaped: the extent-tree depth and fullness are controlled by fragmenting the attacker's own file, writeback is forced on demand with fsync/sync_file_range, and the -ENOMEM that triggers the fallthrough is inducible by an unprivileged task creating memory pressure against GFP_NOFS allocations, which cannot fall back on filesystem reclaim. The reallocation window is widened by the sleeping ext4_ext_zeroout() block I/O on the same code path.\nPR:L - Only an unprivileged local account with write access to any ext4 file (world-writable /tmp or the user's home directory) is needed; no capability, mount privilege, or admin right is checked anywhere along ext4_do_writepages \u2192 ext4_ext_map_blocks \u2192 ext4_split_extent_at.\nUI:N - The attacker operates entirely on files they own and triggers writeback themselves; no victim action, mount of a crafted image, or administrator involvement is required.\nS:U - The use-after-free corrupts kernel slab memory within the same kernel security authority, with no crossing of a VM, IOMMU, or hypervisor boundary.\nC:H - The freed struct ext4_ext_path array lives in a sprayable general kmalloc cache, and the stale p_depth/p_bh fields are dereferenced, so a reallocated object lets the attacker point ext4 at arbitrary kernel addresses and observe results, giving disclosure of arbitrary kernel memory.\nI:H - __ext4_ext_dirty() performs set_buffer_verified() (an arbitrary bit set) and ext4_extent_block_csum_set() (a controlled 4-byte write through a forged buffer_head b_data pointer) on the reallocated object, a classic UAF write primitive usable for control-flow hijack; ext4_ext_zeroout() on the stale extent can additionally zero incorrect on-disk blocks.\nA:H - Even without successful heap grooming the dangling path dereference reliably oopses or panics the kernel in a writeback kworker, as demonstrated by the reported KASAN slab-use-after-free, and it can be retriggered at will."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "393a46f60ea4f249dc9d496d4eb2d542f5e11ade", "versionType": "git"}, {"status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "448100a29395b0c8b4c42967155849fe0fbe808f", "versionType": "git"}, {"status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "e52f933598b781d291b9297e39c463536da0e185", "versionType": "git"}, {"status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "cafcc1bd62934547c76abf46c6d0d54f135006fe", "versionType": "git"}, {"status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "a5401d4c3e2a3d25643c567d26e6de327774a2c9", "versionType": "git"}, {"status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "8fe117790b37c84c651e2bad9efc0e7fda73c0e3", "versionType": "git"}, {"status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "5d949ea75bb529ea6342e83465938a3b0ac51238", "versionType": "git"}, {"status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "915ac3630488af0ca194dc63b86d99802b4f6e18", "versionType": "git"}, {"status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "lessThan": "c26ab35702f8cd0cdc78f96aa5856bfb77be798f", "versionType": "git"}], "programFiles": ["fs/ext4/extents.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.18"}, {"status": "unaffected", "version": "0", "lessThan": "3.18", "versionType": "semver"}, {"status": "unaffected", "version": "4.19.323", "versionType": "semver", "lessThanOrEqual": "4.19.*"}, {"status": "unaffected", "version": "5.4.290", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.227", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.168", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.113", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.55", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.10.14", "versionType": "semver", "lessThanOrEqual": "6.10.*"}, {"status": "unaffected", "version": "6.11.3", "versionType": "semver", "lessThanOrEqual": "6.11.*"}, {"status": "unaffected", "version": "6.12", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/ext4/extents.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/393a46f60ea4f249dc9d496d4eb2d542f5e11ade"}, {"url": "https://git.kernel.org/stable/c/448100a29395b0c8b4c42967155849fe0fbe808f"}, {"url": "https://git.kernel.org/stable/c/e52f933598b781d291b9297e39c463536da0e185"}, {"url": "https://git.kernel.org/stable/c/cafcc1bd62934547c76abf46c6d0d54f135006fe"}, {"url": "https://git.kernel.org/stable/c/a5401d4c3e2a3d25643c567d26e6de327774a2c9"}, {"url": "https://git.kernel.org/stable/c/8fe117790b37c84c651e2bad9efc0e7fda73c0e3"}, {"url": "https://git.kernel.org/stable/c/5d949ea75bb529ea6342e83465938a3b0ac51238"}, {"url": "https://git.kernel.org/stable/c/915ac3630488af0ca194dc63b86d99802b4f6e18"}, {"url": "https://git.kernel.org/stable/c/c26ab35702f8cd0cdc78f96aa5856bfb77be798f"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix slab-use-after-free in ext4_split_extent_at()\n\nWe hit the following use-after-free:\n\n==================================================================\nBUG: KASAN: slab-use-after-free in ext4_split_extent_at+0xba8/0xcc0\nRead of size 2 at addr ffff88810548ed08 by task kworker/u20:0/40\nCPU: 0 PID: 40 Comm: kworker/u20:0 Not tainted 6.9.0-dirty #724\nCall Trace:\n <TASK>\n kasan_report+0x93/0xc0\n ext4_split_extent_at+0xba8/0xcc0\n ext4_split_extent.isra.0+0x18f/0x500\n ext4_split_convert_extents+0x275/0x750\n ext4_ext_handle_unwritten_extents+0x73e/0x1580\n ext4_ext_map_blocks+0xe20/0x2dc0\n ext4_map_blocks+0x724/0x1700\n ext4_do_writepages+0x12d6/0x2a70\n[...]\n\nAllocated by task 40:\n __kmalloc_noprof+0x1ac/0x480\n ext4_find_extent+0xf3b/0x1e70\n ext4_ext_map_blocks+0x188/0x2dc0\n ext4_map_blocks+0x724/0x1700\n ext4_do_writepages+0x12d6/0x2a70\n[...]\n\nFreed by task 40:\n kfree+0xf1/0x2b0\n ext4_find_extent+0xa71/0x1e70\n ext4_ext_insert_extent+0xa22/0x3260\n ext4_split_extent_at+0x3ef/0xcc0\n ext4_split_extent.isra.0+0x18f/0x500\n ext4_split_convert_extents+0x275/0x750\n ext4_ext_handle_unwritten_extents+0x73e/0x1580\n ext4_ext_map_blocks+0xe20/0x2dc0\n ext4_map_blocks+0x724/0x1700\n ext4_do_writepages+0x12d6/0x2a70\n[...]\n==================================================================\n\nThe flow of issue triggering is as follows:\n\next4_split_extent_at\n path = *ppath\n ext4_ext_insert_extent(ppath)\n ext4_ext_create_new_leaf(ppath)\n ext4_find_extent(orig_path)\n path = *orig_path\n read_extent_tree_block\n // return -ENOMEM or -EIO\n ext4_free_ext_path(path)\n kfree(path)\n *orig_path = NULL\n a. If err is -ENOMEM:\n ext4_ext_dirty(path + path->p_depth)\n // path use-after-free !!!\n b. If err is -EIO and we have EXT_DEBUG defined:\n ext4_ext_show_leaf(path)\n eh = path[depth].p_hdr\n // path also use-after-free !!!\n\nSo when trying to zeroout or fix the extent length, call ext4_find_extent()\nto update the path.\n\nIn addition we use *ppath directly as an ext4_ext_show_leaf() input to\navoid possible use-after-free when EXT_DEBUG is defined, and to avoid\nunnecessary path updates."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.19.323", "versionStartIncluding": "3.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.290", "versionStartIncluding": "3.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.227", "versionStartIncluding": "3.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.168", "versionStartIncluding": "3.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.113", "versionStartIncluding": "3.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.55", "versionStartIncluding": "3.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.10.14", "versionStartIncluding": "3.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.11.3", "versionStartIncluding": "3.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12", "versionStartIncluding": "3.18"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:40:22.502Z"}}}, "cveMetadata": {"cveId": "CVE-2024-49884", "state": "PUBLISHED", "dateUpdated": "2026-10-15T00:53:34.802Z", "dateReserved": "2024-10-21T12:17:06.022Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-10-21T18:01:21.517Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/ext4/extents.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "393a46f60ea4f249dc9d496d4eb2d542f5e11ade", "status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "versionType": "git"}, {"lessThan": "448100a29395b0c8b4c42967155849fe0fbe808f", "status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "versionType": "git"}, {"lessThan": "e52f933598b781d291b9297e39c463536da0e185", "status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "versionType": "git"}, {"lessThan": "cafcc1bd62934547c76abf46c6d0d54f135006fe", "status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "versionType": "git"}, {"lessThan": "a5401d4c3e2a3d25643c567d26e6de327774a2c9", "status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "versionType": "git"}, {"lessThan": "8fe117790b37c84c651e2bad9efc0e7fda73c0e3", "status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "versionType": "git"}, {"lessThan": "5d949ea75bb529ea6342e83465938a3b0ac51238", "status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "versionType": "git"}, {"lessThan": "915ac3630488af0ca194dc63b86d99802b4f6e18", "status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "versionType": "git"}, {"lessThan": "c26ab35702f8cd0cdc78f96aa5856bfb77be798f", "status": "affected", "version": "dfe5080939ea4686b3414b5d970a9b26733c57a4", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/ext4/extents.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.18"}, {"lessThan": "3.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "4.19.*", "status": "unaffected", "version": "4.19.323", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.290", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.227", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.168", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.113", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.55", "versionType": "semver"}, {"lessThanOrEqual": "6.10.*", "status": "unaffected", "version": "6.10.14", "versionType": "semver"}, {"lessThanOrEqual": "6.11.*", "status": "unaffected", "version": "6.11.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.12", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"affectedData": [{"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "vendor": "Siemens", "versions": [{"lessThan": "V3.1.5", "status": "affected", "version": "V3.1.0", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "vendor": "Siemens", "versions": [{"lessThan": "V3.1.5", "status": "affected", "version": "V3.1.0", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "vendor": "Siemens", "versions": [{"lessThan": "V3.1.5", "status": "affected", "version": "V3.1.0", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "vendor": "Siemens", "versions": [{"lessThan": "V3.1.5", "status": "affected", "version": "V3.1.0", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "vendor": "Siemens", "versions": [{"lessThan": "V3.1.5", "status": "affected", "version": "V3.1.0", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "RUGGEDCOM RST2428P", "vendor": "Siemens", "versions": [{"lessThan": "V3.2", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family", "vendor": "Siemens", "versions": [{"lessThan": "V3.2", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SCALANCE XCM-/XRM-/XCH-/XRH-300 family", "vendor": "Siemens", "versions": [{"lessThan": "V3.2", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "4CF15846-AEEF-4FBF-BED3-18AFD682270F", "versionEndExcluding": "4.19.323", "versionStartIncluding": "3.18", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0482BD9E-8D81-44E9-8793-05E5ACCB0CCD", "versionEndExcluding": "5.4.290", "versionStartIncluding": "4.20", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "795A3EE6-0CAB-4409-A903-151C94ACECC0", "versionEndExcluding": "5.10.227", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "4D51C05D-455B-4D8D-89E7-A58E140B864C", "versionEndExcluding": "5.15.168", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D01BD22E-ACD1-4618-9D01-6116570BE1EE", "versionEndExcluding": "6.1.113", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E90B9576-56C4-47BC-AAB0-C5B2D438F5D0", "versionEndExcluding": "6.6.55", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "4C16BCE0-FFA0-4599-BE0A-1FD65101C021", "versionEndExcluding": "6.10.14", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "54D9C704-D679-41A7-9C40-10A6B1E7FFE9", "versionEndExcluding": "6.11.3", "versionStartIncluding": "6.11", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix slab-use-after-free in ext4_split_extent_at()\n\nWe hit the following use-after-free:\n\n==================================================================\nBUG: KASAN: slab-use-after-free in ext4_split_extent_at+0xba8/0xcc0\nRead of size 2 at addr ffff88810548ed08 by task kworker/u20:0/40\nCPU: 0 PID: 40 Comm: kworker/u20:0 Not tainted 6.9.0-dirty #724\nCall Trace:\n <TASK>\n kasan_report+0x93/0xc0\n ext4_split_extent_at+0xba8/0xcc0\n ext4_split_extent.isra.0+0x18f/0x500\n ext4_split_convert_extents+0x275/0x750\n ext4_ext_handle_unwritten_extents+0x73e/0x1580\n ext4_ext_map_blocks+0xe20/0x2dc0\n ext4_map_blocks+0x724/0x1700\n ext4_do_writepages+0x12d6/0x2a70\n[...]\n\nAllocated by task 40:\n __kmalloc_noprof+0x1ac/0x480\n ext4_find_extent+0xf3b/0x1e70\n ext4_ext_map_blocks+0x188/0x2dc0\n ext4_map_blocks+0x724/0x1700\n ext4_do_writepages+0x12d6/0x2a70\n[...]\n\nFreed by task 40:\n kfree+0xf1/0x2b0\n ext4_find_extent+0xa71/0x1e70\n ext4_ext_insert_extent+0xa22/0x3260\n ext4_split_extent_at+0x3ef/0xcc0\n ext4_split_extent.isra.0+0x18f/0x500\n ext4_split_convert_extents+0x275/0x750\n ext4_ext_handle_unwritten_extents+0x73e/0x1580\n ext4_ext_map_blocks+0xe20/0x2dc0\n ext4_map_blocks+0x724/0x1700\n ext4_do_writepages+0x12d6/0x2a70\n[...]\n==================================================================\n\nThe flow of issue triggering is as follows:\n\next4_split_extent_at\n path = *ppath\n ext4_ext_insert_extent(ppath)\n ext4_ext_create_new_leaf(ppath)\n ext4_find_extent(orig_path)\n path = *orig_path\n read_extent_tree_block\n // return -ENOMEM or -EIO\n ext4_free_ext_path(path)\n kfree(path)\n *orig_path = NULL\n a. If err is -ENOMEM:\n ext4_ext_dirty(path + path->p_depth)\n // path use-after-free !!!\n b. If err is -EIO and we have EXT_DEBUG defined:\n ext4_ext_show_leaf(path)\n eh = path[depth].p_hdr\n // path also use-after-free !!!\n\nSo when trying to zeroout or fix the extent length, call ext4_find_extent()\nto update the path.\n\nIn addition we use *ppath directly as an ext4_ext_show_leaf() input to\navoid possible use-after-free when EXT_DEBUG is defined, and to avoid\nunnecessary path updates."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: correcci\u00f3n de slab-use-after-free en ext4_split_extent_at() Nos topamos con el siguiente use after free: ====================================================================== ERROR: KASAN: slab-use-after-free en ext4_split_extent_at+0xba8/0xcc0 Lectura de tama\u00f1o 2 en la direcci\u00f3n ffff88810548ed08 por la tarea kworker/u20:0/40 CPU: 0 PID: 40 Comm: kworker/u20:0 No contaminado 6.9.0-dirty #724 Seguimiento de llamadas: kasan_report+0x93/0xc0 ext4_split_extent_at+0xba8/0xcc0 ext4_split_extent.isra.0+0x18f/0x500 ext4_split_convert_extents+0x275/0x750 ext4_ext_handle_unwritten_extents+0x73e/0x1580 ext4_ext_map_blocks+0xe20/0x2dc0 ext4_map_blocks+0x724/0x1700 ext4_do_writepages+0x12d6/0x2a70 [...] Asignado por la tarea 40: __kmalloc_noprof+0x1ac/0x480 ext4_find_extent+0xf3b/0x1e70 ext4_ext_map_blocks+0x188/0x2dc0 ext4_map_blocks+0x724/0x1700 ext4_do_writepages+0x12d6/0x2a70 [...] Liberado por la tarea 40: kfree+0xf1/0x2b0 ext4_find_extent+0xa71/0x1e70 ext4_ext_insert_extent+0xa22/0x3260 ext4_split_extent_at+0x3ef/0xcc0 ext4_split_extent.isra.0+0x18f/0x500 ext4_split_convert_extents+0x275/0x750 ext4_ext_handle_unwritten_extents+0x73e/0x1580 ext4_ext_map_blocks+0xe20/0x2dc0 ext4_map_blocks+0x724/0x1700 ext4_do_writepages+0x12d6/0x2a70 [...] ==================================================================== El flujo de activaci\u00f3n del problema es el siguiente: ext4_split_extent_at path = *ppath ext4_ext_insert_extent(ppath) ext4_ext_create_new_leaf(ppath) ext4_find_extent(orig_path) path = *orig_path read_extent_tree_block // devuelve -ENOMEM o -EIO ext4_free_ext_path(path) kfree(path) *orig_path = NULL a. Si err es -ENOMEM: ext4_ext_dirty(path + path-&gt;p_depth) // \u00a1\u00a1\u00a1path use after free!!! b. Si err es -EIO y tenemos EXT_DEBUG definido: ext4_ext_show_leaf(path) eh = path[depth].p_hdr // \u00a1\u00a1\u00a1La ruta tambi\u00e9n es use after free!!! Por lo tanto, cuando intente poner a cero o corregir la longitud de la extensi\u00f3n, llame a ext4_find_extent() para actualizar la ruta. Adem\u00e1s, usamos *ppath directamente como una entrada de ext4_ext_show_leaf() para evitar un posible use after free cuando se define EXT_DEBUG y para evitar actualizaciones de ruta innecesarias."}], "id": "CVE-2024-49884", "lastModified": "2026-10-15T01:18:59.270", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-49884", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-10-22T13:45:15.776351Z", "version": "2.0.3"}}]}, "published": "2024-10-21T18:15:11.130", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/393a46f60ea4f249dc9d496d4eb2d542f5e11ade"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/448100a29395b0c8b4c42967155849fe0fbe808f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5d949ea75bb529ea6342e83465938a3b0ac51238"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8fe117790b37c84c651e2bad9efc0e7fda73c0e3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/915ac3630488af0ca194dc63b86d99802b4f6e18"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a5401d4c3e2a3d25643c567d26e6de327774a2c9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c26ab35702f8cd0cdc78f96aa5856bfb77be798f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cafcc1bd62934547c76abf46c6d0d54f135006fe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e52f933598b781d291b9297e39c463536da0e185"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Broken Link"], "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-355557.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-398330.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2025:6966", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:6966", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}], "bugzilla": {"description": "kernel: ext4: fix slab-use-after-free in ext4_split_extent_at()", "id": "2320573", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320573"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\next4: fix slab-use-after-free in ext4_split_extent_at()\nWe hit the following use-after-free:\n==================================================================\nBUG: KASAN: slab-use-after-free in ext4_split_extent_at+0xba8/0xcc0\nRead of size 2 at addr ffff88810548ed08 by task kworker/u20:0/40\nCPU: 0 PID: 40 Comm: kworker/u20:0 Not tainted 6.9.0-dirty #724\nCall Trace:\n<TASK>\nkasan_report+0x93/0xc0\next4_split_extent_at+0xba8/0xcc0\next4_split_extent.isra.0+0x18f/0x500\next4_split_convert_extents+0x275/0x750\next4_ext_handle_unwritten_extents+0x73e/0x1580\next4_ext_map_blocks+0xe20/0x2dc0\next4_map_blocks+0x724/0x1700\next4_do_writepages+0x12d6/0x2a70\n[...]\nAllocated by task 40:\n__kmalloc_noprof+0x1ac/0x480\next4_find_extent+0xf3b/0x1e70\next4_ext_map_blocks+0x188/0x2dc0\next4_map_blocks+0x724/0x1700\next4_do_writepages+0x12d6/0x2a70\n[...]\nFreed by task 40:\nkfree+0xf1/0x2b0\next4_find_extent+0xa71/0x1e70\next4_ext_insert_extent+0xa22/0x3260\next4_split_extent_at+0x3ef/0xcc0\next4_split_extent.isra.0+0x18f/0x500\next4_split_convert_extents+0x275/0x750\next4_ext_handle_unwritten_extents+0x73e/0x1580\next4_ext_map_blocks+0xe20/0x2dc0\next4_map_blocks+0x724/0x1700\next4_do_writepages+0x12d6/0x2a70\n[...]\n==================================================================\nThe flow of issue triggering is as follows:\next4_split_extent_at\npath = *ppath\next4_ext_insert_extent(ppath)\next4_ext_create_new_leaf(ppath)\next4_find_extent(orig_path)\npath = *orig_path\nread_extent_tree_block\n// return -ENOMEM or -EIO\next4_free_ext_path(path)\nkfree(path)\n*orig_path = NULL\na. If err is -ENOMEM:\next4_ext_dirty(path + path->p_depth)\n// path use-after-free !!!\nb. If err is -EIO and we have EXT_DEBUG defined:\next4_ext_show_leaf(path)\neh = path[depth].p_hdr\n// path also use-after-free !!!\nSo when trying to zeroout or fix the extent length, call ext4_find_extent()\nto update the path.\nIn addition we use *ppath directly as an ext4_ext_show_leaf() input to\navoid possible use-after-free when EXT_DEBUG is defined, and to avoid\nunnecessary path updates."], "name": "CVE-2024-49884", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-49884\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-49884\nhttps://lore.kernel.org/linux-cve-announce/2024102116-CVE-2024-49884-fa56@gregkh/T"], "statement": "This issue is considered to be a moderate impact flaw, as the exploitation for this will need an ADMIN (or ROOT) privilege (PR:H).", "threat_severity": "Moderate"}

{}