{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-40246", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.181Z", "datePublished": "2025-12-04T16:08:09.751Z", "dateUpdated": "2025-12-04T16:08:09.751Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-12-04T16:08:09.751Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: fix out of bounds memory read error in symlink repair\n\nxfs/286 produced this report on my test fleet:\n\n ==================================================================\n BUG: KFENCE: out-of-bounds read in memcpy_orig+0x54/0x110\n\n Out-of-bounds read at 0xffff88843fe9e038 (184B right of kfence-#184):\n memcpy_orig+0x54/0x110\n xrep_symlink_salvage_inline+0xb3/0xf0 [xfs]\n xrep_symlink_salvage+0x100/0x110 [xfs]\n xrep_symlink+0x2e/0x80 [xfs]\n xrep_attempt+0x61/0x1f0 [xfs]\n xfs_scrub_metadata+0x34f/0x5c0 [xfs]\n xfs_ioc_scrubv_metadata+0x387/0x560 [xfs]\n xfs_file_ioctl+0xe23/0x10e0 [xfs]\n __x64_sys_ioctl+0x76/0xc0\n do_syscall_64+0x4e/0x1e0\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\n kfence-#184: 0xffff88843fe9df80-0xffff88843fe9dfea, size=107, cache=kmalloc-128\n\n allocated by task 3470 on cpu 1 at 263329.131592s (192823.508886s ago):\n xfs_init_local_fork+0x79/0xe0 [xfs]\n xfs_iformat_local+0xa4/0x170 [xfs]\n xfs_iformat_data_fork+0x148/0x180 [xfs]\n xfs_inode_from_disk+0x2cd/0x480 [xfs]\n xfs_iget+0x450/0xd60 [xfs]\n xfs_bulkstat_one_int+0x6b/0x510 [xfs]\n xfs_bulkstat_iwalk+0x1e/0x30 [xfs]\n xfs_iwalk_ag_recs+0xdf/0x150 [xfs]\n xfs_iwalk_run_callbacks+0xb9/0x190 [xfs]\n xfs_iwalk_ag+0x1dc/0x2f0 [xfs]\n xfs_iwalk_args.constprop.0+0x6a/0x120 [xfs]\n xfs_iwalk+0xa4/0xd0 [xfs]\n xfs_bulkstat+0xfa/0x170 [xfs]\n xfs_ioc_fsbulkstat.isra.0+0x13a/0x230 [xfs]\n xfs_file_ioctl+0xbf2/0x10e0 [xfs]\n __x64_sys_ioctl+0x76/0xc0\n do_syscall_64+0x4e/0x1e0\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\n CPU: 1 UID: 0 PID: 1300113 Comm: xfs_scrub Not tainted 6.18.0-rc4-djwx #rc4 PREEMPT(lazy) 3d744dd94e92690f00a04398d2bd8631dcef1954\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-4.module+el8.8.0+21164+ed375313 04/01/2014\n ==================================================================\n\nOn further analysis, I realized that the second parameter to min() is\nnot correct. xfs_ifork::if_bytes is the size of the xfs_ifork::if_data\nbuffer. if_bytes can be smaller than the data fork size because:\n\n(a) the forkoff code tries to keep the data area as large as possible\n(b) for symbolic links, if_bytes is the ondisk file size + 1\n(c) forkoff is always a multiple of 8.\n\nCase in point: for a single-byte symlink target, forkoff will be\n8 but the buffer will only be 2 bytes long.\n\nIn other words, the logic here is wrong and we walk off the end of the\nincore buffer. Fix that."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/xfs/scrub/symlink_repair.c"], "versions": [{"version": "2651923d8d8db00a57665822f017fa7c76758044", "lessThan": "7c2d68e091584149fe89bcbaf9b99b3162d46ee7", "status": "affected", "versionType": "git"}, {"version": "2651923d8d8db00a57665822f017fa7c76758044", "lessThan": "81a8685cac4bf081c93a7df591644f4f80240bb9", "status": "affected", "versionType": "git"}, {"version": "2651923d8d8db00a57665822f017fa7c76758044", "lessThan": "678e1cc2f482e0985a0613ab4a5bf89c497e5acc", "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/xfs/scrub/symlink_repair.c"], "versions": [{"version": "6.10", "status": "affected"}, {"version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.60", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.10", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18", "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": "6.10", "versionEndExcluding": "6.12.60"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.17.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.18"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7c2d68e091584149fe89bcbaf9b99b3162d46ee7"}, {"url": "https://git.kernel.org/stable/c/81a8685cac4bf081c93a7df591644f4f80240bb9"}, {"url": "https://git.kernel.org/stable/c/678e1cc2f482e0985a0613ab4a5bf89c497e5acc"}], "title": "xfs: fix out of bounds memory read error in symlink repair", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: fix out of bounds memory read error in symlink repair\n\nxfs/286 produced this report on my test fleet:\n\n ==================================================================\n BUG: KFENCE: out-of-bounds read in memcpy_orig+0x54/0x110\n\n Out-of-bounds read at 0xffff88843fe9e038 (184B right of kfence-#184):\n memcpy_orig+0x54/0x110\n xrep_symlink_salvage_inline+0xb3/0xf0 [xfs]\n xrep_symlink_salvage+0x100/0x110 [xfs]\n xrep_symlink+0x2e/0x80 [xfs]\n xrep_attempt+0x61/0x1f0 [xfs]\n xfs_scrub_metadata+0x34f/0x5c0 [xfs]\n xfs_ioc_scrubv_metadata+0x387/0x560 [xfs]\n xfs_file_ioctl+0xe23/0x10e0 [xfs]\n __x64_sys_ioctl+0x76/0xc0\n do_syscall_64+0x4e/0x1e0\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\n kfence-#184: 0xffff88843fe9df80-0xffff88843fe9dfea, size=107, cache=kmalloc-128\n\n allocated by task 3470 on cpu 1 at 263329.131592s (192823.508886s ago):\n xfs_init_local_fork+0x79/0xe0 [xfs]\n xfs_iformat_local+0xa4/0x170 [xfs]\n xfs_iformat_data_fork+0x148/0x180 [xfs]\n xfs_inode_from_disk+0x2cd/0x480 [xfs]\n xfs_iget+0x450/0xd60 [xfs]\n xfs_bulkstat_one_int+0x6b/0x510 [xfs]\n xfs_bulkstat_iwalk+0x1e/0x30 [xfs]\n xfs_iwalk_ag_recs+0xdf/0x150 [xfs]\n xfs_iwalk_run_callbacks+0xb9/0x190 [xfs]\n xfs_iwalk_ag+0x1dc/0x2f0 [xfs]\n xfs_iwalk_args.constprop.0+0x6a/0x120 [xfs]\n xfs_iwalk+0xa4/0xd0 [xfs]\n xfs_bulkstat+0xfa/0x170 [xfs]\n xfs_ioc_fsbulkstat.isra.0+0x13a/0x230 [xfs]\n xfs_file_ioctl+0xbf2/0x10e0 [xfs]\n __x64_sys_ioctl+0x76/0xc0\n do_syscall_64+0x4e/0x1e0\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\n CPU: 1 UID: 0 PID: 1300113 Comm: xfs_scrub Not tainted 6.18.0-rc4-djwx #rc4 PREEMPT(lazy) 3d744dd94e92690f00a04398d2bd8631dcef1954\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-4.module+el8.8.0+21164+ed375313 04/01/2014\n ==================================================================\n\nOn further analysis, I realized that the second parameter to min() is\nnot correct. xfs_ifork::if_bytes is the size of the xfs_ifork::if_data\nbuffer. if_bytes can be smaller than the data fork size because:\n\n(a) the forkoff code tries to keep the data area as large as possible\n(b) for symbolic links, if_bytes is the ondisk file size + 1\n(c) forkoff is always a multiple of 8.\n\nCase in point: for a single-byte symlink target, forkoff will be\n8 but the buffer will only be 2 bytes long.\n\nIn other words, the logic here is wrong and we walk off the end of the\nincore buffer. Fix that."}], "id": "CVE-2025-40246", "lastModified": "2026-04-15T00:35:42.020", "metrics": {}, "published": "2025-12-04T16:16:17.970", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/678e1cc2f482e0985a0613ab4a5bf89c497e5acc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7c2d68e091584149fe89bcbaf9b99b3162d46ee7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/81a8685cac4bf081c93a7df591644f4f80240bb9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: xfs: fix out of bounds memory read error in symlink repair", "id": "2418882", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2418882"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nxfs: fix out of bounds memory read error in symlink repair\nxfs/286 produced this report on my test fleet:\n==================================================================\nBUG: KFENCE: out-of-bounds read in memcpy_orig+0x54/0x110\nOut-of-bounds read at 0xffff88843fe9e038 (184B right of kfence-#184):\nmemcpy_orig+0x54/0x110\nxrep_symlink_salvage_inline+0xb3/0xf0 [xfs]\nxrep_symlink_salvage+0x100/0x110 [xfs]\nxrep_symlink+0x2e/0x80 [xfs]\nxrep_attempt+0x61/0x1f0 [xfs]\nxfs_scrub_metadata+0x34f/0x5c0 [xfs]\nxfs_ioc_scrubv_metadata+0x387/0x560 [xfs]\nxfs_file_ioctl+0xe23/0x10e0 [xfs]\n__x64_sys_ioctl+0x76/0xc0\ndo_syscall_64+0x4e/0x1e0\nentry_SYSCALL_64_after_hwframe+0x4b/0x53\nkfence-#184: 0xffff88843fe9df80-0xffff88843fe9dfea, size=107, cache=kmalloc-128\nallocated by task 3470 on cpu 1 at 263329.131592s (192823.508886s ago):\nxfs_init_local_fork+0x79/0xe0 [xfs]\nxfs_iformat_local+0xa4/0x170 [xfs]\nxfs_iformat_data_fork+0x148/0x180 [xfs]\nxfs_inode_from_disk+0x2cd/0x480 [xfs]\nxfs_iget+0x450/0xd60 [xfs]\nxfs_bulkstat_one_int+0x6b/0x510 [xfs]\nxfs_bulkstat_iwalk+0x1e/0x30 [xfs]\nxfs_iwalk_ag_recs+0xdf/0x150 [xfs]\nxfs_iwalk_run_callbacks+0xb9/0x190 [xfs]\nxfs_iwalk_ag+0x1dc/0x2f0 [xfs]\nxfs_iwalk_args.constprop.0+0x6a/0x120 [xfs]\nxfs_iwalk+0xa4/0xd0 [xfs]\nxfs_bulkstat+0xfa/0x170 [xfs]\nxfs_ioc_fsbulkstat.isra.0+0x13a/0x230 [xfs]\nxfs_file_ioctl+0xbf2/0x10e0 [xfs]\n__x64_sys_ioctl+0x76/0xc0\ndo_syscall_64+0x4e/0x1e0\nentry_SYSCALL_64_after_hwframe+0x4b/0x53\nCPU: 1 UID: 0 PID: 1300113 Comm: xfs_scrub Not tainted 6.18.0-rc4-djwx #rc4 PREEMPT(lazy) 3d744dd94e92690f00a04398d2bd8631dcef1954\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-4.module+el8.8.0+21164+ed375313 04/01/2014\n==================================================================\nOn further analysis, I realized that the second parameter to min() is\nnot correct. xfs_ifork::if_bytes is the size of the xfs_ifork::if_data\nbuffer. if_bytes can be smaller than the data fork size because:\n(a) the forkoff code tries to keep the data area as large as possible\n(b) for symbolic links, if_bytes is the ondisk file size + 1\n(c) forkoff is always a multiple of 8.\nCase in point: for a single-byte symlink target, forkoff will be\n8 but the buffer will only be 2 bytes long.\nIn other words, the logic here is wrong and we walk off the end of the\nincore buffer. Fix that."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2025-40246", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-12-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40246\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40246\nhttps://lore.kernel.org/linux-cve-announce/2025120427-CVE-2025-40246-7e80@gregkh/T"], "threat_severity": "Moderate"}

{}