CVE-2022-48674

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-48674", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-25T13:44:28.322Z", "datePublished": "2024-05-03T14:51:57.294Z", "dateUpdated": "2026-08-05T08:51:44.056Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:51:44.056Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix pcluster use-after-free on UP platforms\n\nDuring stress testing with CONFIG_SMP disabled, KASAN reports as below:\n\n==================================================================\nBUG: KASAN: use-after-free in __mutex_lock+0xe5/0xc30\nRead of size 8 at addr ffff8881094223f8 by task stress/7789\n\nCPU: 0 PID: 7789 Comm: stress Not tainted 6.0.0-rc1-00002-g0d53d2e882f9 #3\nHardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011\nCall Trace:\n <TASK>\n..\n __mutex_lock+0xe5/0xc30\n..\n z_erofs_do_read_page+0x8ce/0x1560\n..\n z_erofs_readahead+0x31c/0x580\n..\nFreed by task 7787\n kasan_save_stack+0x1e/0x40\n kasan_set_track+0x20/0x30\n kasan_set_free_info+0x20/0x40\n __kasan_slab_free+0x10c/0x190\n kmem_cache_free+0xed/0x380\n rcu_core+0x3d5/0xc90\n __do_softirq+0x12d/0x389\n\nLast potentially related work creation:\n kasan_save_stack+0x1e/0x40\n __kasan_record_aux_stack+0x97/0xb0\n call_rcu+0x3d/0x3f0\n erofs_shrink_workstation+0x11f/0x210\n erofs_shrink_scan+0xdc/0x170\n shrink_slab.constprop.0+0x296/0x530\n drop_slab+0x1c/0x70\n drop_caches_sysctl_handler+0x70/0x80\n proc_sys_call_handler+0x20a/0x2f0\n vfs_write+0x555/0x6c0\n ksys_write+0xbe/0x160\n do_syscall_64+0x3b/0x90\n\nThe root cause is that erofs_workgroup_unfreeze() doesn't reset to\norig_val thus it causes a race that the pcluster reuses unexpectedly\nbefore freeing.\n\nSince UP platforms are quite rare now, such path becomes unnecessary.\nLet's drop such specific-designed path directly instead."}], "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 UAF is reached only through local VFS reads of compressed EROFS files (z_erofs_readahead/z_erofs_do_read_page \u2192 erofs_find_workgroup) racing the local erofs shrinker; erofs uses FS_REQUIRES_DEV and has no network-protocol entry point.\nAC:L - On a vulnerable !CONFIG_SMP kernel the attacker controls both sides\u2014concurrent reads of already-mounted compressed EROFS files plus memory pressure that drives erofs_shrink_scan\u2014so the failed unfreeze-to-0 race is reliably repeatable without conditions outside attacker influence.\nPR:L - Mounting needs CAP_SYS_ADMIN, but once EROFS is mounted (common on Android system images and container rootfs), an unprivileged local user triggers the path by ordinary open/read of compressed files and by inducing reclaim; no real root is required.\nUI:N - The attacker drives the reads and memory pressure themselves on a pre-mounted EROFS volume; no separate victim action such as mounting or opening a crafted file is required.\nS:U - The pcluster slab UAF corrupts host-kernel memory within the same privilege domain; there is no VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - This is a use-after-free of a z_erofs_pcluster (KASAN UAF in __mutex_lock on pcl->lock after RCU free), which enables heap reuse and arbitrary kernel read primitives.\nI:H - UAF of the heap-allocated pcluster (mutex, page pointers, decompression state) is heap-sprayable and can yield arbitrary write / control-flow hijacking primitives in kernel context.\nA:H - The demonstrated KASAN use-after-free and further use of the freed pcluster can oops or panic the kernel even without full exploitation, which is Availability High."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/erofs/internal.h"], "versions": [{"version": "73f5c66df3e26ab750cefcb9a3e08c71c9f79cad", "lessThan": "8ddd001cef5e82d19192e6861068463ecca5f556", "status": "affected", "versionType": "git"}, {"version": "73f5c66df3e26ab750cefcb9a3e08c71c9f79cad", "lessThan": "94c34faaafe7b55adc2d8d881db195b646959b9e", "status": "affected", "versionType": "git"}, {"version": "73f5c66df3e26ab750cefcb9a3e08c71c9f79cad", "lessThan": "2f44013e39984c127c6efedf70e6b5f4e9dcf315", "status": "affected", "versionType": "git"}, {"version": "08ec9e6892cc792d7f8fe4d13bd8a0e91fb23488", "status": "affected", "versionType": "git"}, {"version": "78c46113413bea1cc345757112aa2642e0f66de5", "status": "affected", "versionType": "git"}, {"version": "4.19.26", "lessThan": "4.20", "status": "affected", "versionType": "semver"}, {"version": "4.20.13", "lessThan": "4.21", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/erofs/internal.h"], "versions": [{"version": "5.0", "status": "affected"}, {"version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.68", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.19.9", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.0", "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": "5.0", "versionEndExcluding": "5.15.68"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.19.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.0"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.26"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8ddd001cef5e82d19192e6861068463ecca5f556"}, {"url": "https://git.kernel.org/stable/c/94c34faaafe7b55adc2d8d881db195b646959b9e"}, {"url": "https://git.kernel.org/stable/c/2f44013e39984c127c6efedf70e6b5f4e9dcf315"}], "title": "erofs: fix pcluster use-after-free on UP platforms", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-416", "lang": "en", "description": "CWE-416 Use After Free"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.2, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2024-06-17T17:40:01.935760Z", "id": "CVE-2022-48674", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-11-21T21:25:20.019Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T15:17:55.810Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/8ddd001cef5e82d19192e6861068463ecca5f556", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/94c34faaafe7b55adc2d8d881db195b646959b9e", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/2f44013e39984c127c6efedf70e6b5f4e9dcf315", "tags": ["x_transferred"]}]}]}}

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"ssvc", "content": {"id": "CVE-2022-48674", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-06-17T17:40:01.935760Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-17T17:40:02.958Z"}}], "cna": {"title": "erofs: fix pcluster use-after-free on UP platforms", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The UAF is reached only through local VFS reads of compressed EROFS files (z_erofs_readahead/z_erofs_do_read_page \u2192 erofs_find_workgroup) racing the local erofs shrinker; erofs uses FS_REQUIRES_DEV and has no network-protocol entry point.\nAC:L - On a vulnerable !CONFIG_SMP kernel the attacker controls both sides\u2014concurrent reads of already-mounted compressed EROFS files plus memory pressure that drives erofs_shrink_scan\u2014so the failed unfreeze-to-0 race is reliably repeatable without conditions outside attacker influence.\nPR:L - Mounting needs CAP_SYS_ADMIN, but once EROFS is mounted (common on Android system images and container rootfs), an unprivileged local user triggers the path by ordinary open/read of compressed files and by inducing reclaim; no real root is required.\nUI:N - The attacker drives the reads and memory pressure themselves on a pre-mounted EROFS volume; no separate victim action such as mounting or opening a crafted file is required.\nS:U - The pcluster slab UAF corrupts host-kernel memory within the same privilege domain; there is no VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - This is a use-after-free of a z_erofs_pcluster (KASAN UAF in __mutex_lock on pcl->lock after RCU free), which enables heap reuse and arbitrary kernel read primitives.\nI:H - UAF of the heap-allocated pcluster (mutex, page pointers, decompression state) is heap-sprayable and can yield arbitrary write / control-flow hijacking primitives in kernel context.\nA:H - The demonstrated KASAN use-after-free and further use of the freed pcluster can oops or panic the kernel even without full exploitation, which is Availability High."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "73f5c66df3e26ab750cefcb9a3e08c71c9f79cad", "lessThan": "8ddd001cef5e82d19192e6861068463ecca5f556", "versionType": "git"}, {"status": "affected", "version": "73f5c66df3e26ab750cefcb9a3e08c71c9f79cad", "lessThan": "94c34faaafe7b55adc2d8d881db195b646959b9e", "versionType": "git"}, {"status": "affected", "version": "73f5c66df3e26ab750cefcb9a3e08c71c9f79cad", "lessThan": "2f44013e39984c127c6efedf70e6b5f4e9dcf315", "versionType": "git"}, {"status": "affected", "version": "08ec9e6892cc792d7f8fe4d13bd8a0e91fb23488", "versionType": "git"}, {"status": "affected", "version": "78c46113413bea1cc345757112aa2642e0f66de5", "versionType": "git"}, {"status": "affected", "version": "4.19.26", "lessThan": "4.20", "versionType": "semver"}, {"status": "affected", "version": "4.20.13", "lessThan": "4.21", "versionType": "semver"}], "programFiles": ["fs/erofs/internal.h"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.0"}, {"status": "unaffected", "version": "0", "lessThan": "5.0", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.68", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "5.19.9", "versionType": "semver", "lessThanOrEqual": "5.19.*"}, {"status": "unaffected", "version": "6.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/erofs/internal.h"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/8ddd001cef5e82d19192e6861068463ecca5f556"}, {"url": "https://git.kernel.org/stable/c/94c34faaafe7b55adc2d8d881db195b646959b9e"}, {"url": "https://git.kernel.org/stable/c/2f44013e39984c127c6efedf70e6b5f4e9dcf315"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix pcluster use-after-free on UP platforms\n\nDuring stress testing with CONFIG_SMP disabled, KASAN reports as below:\n\n==================================================================\nBUG: KASAN: use-after-free in __mutex_lock+0xe5/0xc30\nRead of size 8 at addr ffff8881094223f8 by task stress/7789\n\nCPU: 0 PID: 7789 Comm: stress Not tainted 6.0.0-rc1-00002-g0d53d2e882f9 #3\nHardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011\nCall Trace:\n <TASK>\n..\n __mutex_lock+0xe5/0xc30\n..\n z_erofs_do_read_page+0x8ce/0x1560\n..\n z_erofs_readahead+0x31c/0x580\n..\nFreed by task 7787\n kasan_save_stack+0x1e/0x40\n kasan_set_track+0x20/0x30\n kasan_set_free_info+0x20/0x40\n __kasan_slab_free+0x10c/0x190\n kmem_cache_free+0xed/0x380\n rcu_core+0x3d5/0xc90\n __do_softirq+0x12d/0x389\n\nLast potentially related work creation:\n kasan_save_stack+0x1e/0x40\n __kasan_record_aux_stack+0x97/0xb0\n call_rcu+0x3d/0x3f0\n erofs_shrink_workstation+0x11f/0x210\n erofs_shrink_scan+0xdc/0x170\n shrink_slab.constprop.0+0x296/0x530\n drop_slab+0x1c/0x70\n drop_caches_sysctl_handler+0x70/0x80\n proc_sys_call_handler+0x20a/0x2f0\n vfs_write+0x555/0x6c0\n ksys_write+0xbe/0x160\n do_syscall_64+0x3b/0x90\n\nThe root cause is that erofs_workgroup_unfreeze() doesn't reset to\norig_val thus it causes a race that the pcluster reuses unexpectedly\nbefore freeing.\n\nSince UP platforms are quite rare now, such path becomes unnecessary.\nLet's drop such specific-designed path directly instead."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.68", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.19.9", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.0", "versionStartIncluding": "5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "4.19.26"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "4.20.13"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:51:44.056Z"}}}, "cveMetadata": {"cveId": "CVE-2022-48674", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:51:44.056Z", "dateReserved": "2024-02-25T13:44:28.322Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-03T14:51:57.294Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/erofs/internal.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8ddd001cef5e82d19192e6861068463ecca5f556", "status": "affected", "version": "73f5c66df3e26ab750cefcb9a3e08c71c9f79cad", "versionType": "git"}, {"lessThan": "94c34faaafe7b55adc2d8d881db195b646959b9e", "status": "affected", "version": "73f5c66df3e26ab750cefcb9a3e08c71c9f79cad", "versionType": "git"}, {"lessThan": "2f44013e39984c127c6efedf70e6b5f4e9dcf315", "status": "affected", "version": "73f5c66df3e26ab750cefcb9a3e08c71c9f79cad", "versionType": "git"}, {"status": "affected", "version": "08ec9e6892cc792d7f8fe4d13bd8a0e91fb23488", "versionType": "git"}, {"status": "affected", "version": "78c46113413bea1cc345757112aa2642e0f66de5", "versionType": "git"}, {"lessThan": "4.20", "status": "affected", "version": "4.19.26", "versionType": "semver"}, {"lessThan": "4.21", "status": "affected", "version": "4.20.13", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/erofs/internal.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.0"}, {"lessThan": "5.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.68", "versionType": "semver"}, {"lessThanOrEqual": "5.19.*", "status": "unaffected", "version": "5.19.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "93062AA3-504F-48D6-A3CD-387C194809F6", "versionEndExcluding": "4.20", "versionStartIncluding": "4.19.26", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "689F266A-3B99-4FF1-BDB3-9B755EFADBAE", "versionEndExcluding": "5.15.68", "versionStartIncluding": "4.20.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B4895A99-6E1B-4C76-A510-FDED00AD7D29", "versionEndExcluding": "5.19.9", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "E8BD11A3-8643-49B6-BADE-5029A0117325", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "5F0AD220-F6A9-4012-8636-155F1B841FAD", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "A46498B3-78E1-4623-AAE1-94D29A42BE4E", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "F8446E87-F5F6-41CA-8201-BAE0F0CA6DD9", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix pcluster use-after-free on UP platforms\n\nDuring stress testing with CONFIG_SMP disabled, KASAN reports as below:\n\n==================================================================\nBUG: KASAN: use-after-free in __mutex_lock+0xe5/0xc30\nRead of size 8 at addr ffff8881094223f8 by task stress/7789\n\nCPU: 0 PID: 7789 Comm: stress Not tainted 6.0.0-rc1-00002-g0d53d2e882f9 #3\nHardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011\nCall Trace:\n <TASK>\n..\n __mutex_lock+0xe5/0xc30\n..\n z_erofs_do_read_page+0x8ce/0x1560\n..\n z_erofs_readahead+0x31c/0x580\n..\nFreed by task 7787\n kasan_save_stack+0x1e/0x40\n kasan_set_track+0x20/0x30\n kasan_set_free_info+0x20/0x40\n __kasan_slab_free+0x10c/0x190\n kmem_cache_free+0xed/0x380\n rcu_core+0x3d5/0xc90\n __do_softirq+0x12d/0x389\n\nLast potentially related work creation:\n kasan_save_stack+0x1e/0x40\n __kasan_record_aux_stack+0x97/0xb0\n call_rcu+0x3d/0x3f0\n erofs_shrink_workstation+0x11f/0x210\n erofs_shrink_scan+0xdc/0x170\n shrink_slab.constprop.0+0x296/0x530\n drop_slab+0x1c/0x70\n drop_caches_sysctl_handler+0x70/0x80\n proc_sys_call_handler+0x20a/0x2f0\n vfs_write+0x555/0x6c0\n ksys_write+0xbe/0x160\n do_syscall_64+0x3b/0x90\n\nThe root cause is that erofs_workgroup_unfreeze() doesn't reset to\norig_val thus it causes a race that the pcluster reuses unexpectedly\nbefore freeing.\n\nSince UP platforms are quite rare now, such path becomes unnecessary.\nLet's drop such specific-designed path directly instead."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: erofs: corrige el use-after-free de pcluster en plataformas UP Durante las pruebas de estr\u00e9s con CONFIG_SMP deshabilitado, KASAN informa lo siguiente: ============== ==================================================== == ERROR: KASAN: use-after-free en __mutex_lock+0xe5/0xc30 Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff8881094223f8 por tarea estr\u00e9s/7789 CPU: 0 PID: 7789 Comm: estr\u00e9s No contaminado 6.0.0-rc1-00002-g0d53d2e882f9 # 3 Nombre del hardware: Red Hat KVM, BIOS 0.5.1 01/01/2011 Seguimiento de llamadas: .. __mutex_lock+0xe5/0xc30 .. z_erofs_do_read_page+0x8ce/0x1560 .. z_erofs_readahead+0x31c/0x580 .. Liberado por la tarea 7787 kasan_save_stack+0x1e/0x40 kasan_set_track+0x20/0x30 kasan_set_free_info+0x20/0x40 __kasan_slab_free+0x10c/0x190 kmem_cache_free+0xed/0x380 rcu_core+0x3d5/0xc90 __do_softirq+0x12d/0x 389 \u00daltima creaci\u00f3n de trabajo potencialmente relacionado: kasan_save_stack+0x1e/0x40 __kasan_record_aux_stack+0x97/ 0xb0 call_rcu+0x3d/0x3f0 erofs_shrink_workstation+0x11f/0x210 erofs_shrink_scan+0xdc/0x170 retract_slab.constprop.0+0x296/0x530 drop_slab+0x1c/0x70 drop_caches_sysctl_handler+0x70/0x80 proc_sys_call_handler+0x20a/0x2f0 vfs_write+0x555/0x6c0 ksys_write+0xbe/0x160 do_syscall_64+0x3b/0x90 La causa principal es que erofs_workgroup_unfreeze() no se restablece a orig_val, por lo que provoca una carrera que el pcluster reutiliza inesperadamente antes de liberarse. Dado que las plataformas UP son bastante raras ahora, ese camino se vuelve innecesario. En su lugar, eliminemos directamente esa ruta manipulada espec\u00edficamente."}], "id": "CVE-2022-48674", "lastModified": "2026-08-04T10:17:15.363", "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"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-48674", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-17T17:40:01.935760Z", "version": "2.0.3"}}]}, "published": "2024-05-03T15:15:07.580", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2f44013e39984c127c6efedf70e6b5f4e9dcf315"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8ddd001cef5e82d19192e6861068463ecca5f556"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/94c34faaafe7b55adc2d8d881db195b646959b9e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2f44013e39984c127c6efedf70e6b5f4e9dcf315"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8ddd001cef5e82d19192e6861068463ecca5f556"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/94c34faaafe7b55adc2d8d881db195b646959b9e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: erofs: fix pcluster use-after-free on UP platforms", "id": "2278937", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2278937"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nerofs: fix pcluster use-after-free on UP platforms\nDuring stress testing with CONFIG_SMP disabled, KASAN reports as below:\n==================================================================\nBUG: KASAN: use-after-free in __mutex_lock+0xe5/0xc30\nRead of size 8 at addr ffff8881094223f8 by task stress/7789\nCPU: 0 PID: 7789 Comm: stress Not tainted 6.0.0-rc1-00002-g0d53d2e882f9 #3\nHardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011\nCall Trace:\n<TASK>\n..\n__mutex_lock+0xe5/0xc30\n..\nz_erofs_do_read_page+0x8ce/0x1560\n..\nz_erofs_readahead+0x31c/0x580\n..\nFreed by task 7787\nkasan_save_stack+0x1e/0x40\nkasan_set_track+0x20/0x30\nkasan_set_free_info+0x20/0x40\n__kasan_slab_free+0x10c/0x190\nkmem_cache_free+0xed/0x380\nrcu_core+0x3d5/0xc90\n__do_softirq+0x12d/0x389\nLast potentially related work creation:\nkasan_save_stack+0x1e/0x40\n__kasan_record_aux_stack+0x97/0xb0\ncall_rcu+0x3d/0x3f0\nerofs_shrink_workstation+0x11f/0x210\nerofs_shrink_scan+0xdc/0x170\nshrink_slab.constprop.0+0x296/0x530\ndrop_slab+0x1c/0x70\ndrop_caches_sysctl_handler+0x70/0x80\nproc_sys_call_handler+0x20a/0x2f0\nvfs_write+0x555/0x6c0\nksys_write+0xbe/0x160\ndo_syscall_64+0x3b/0x90\nThe root cause is that erofs_workgroup_unfreeze() doesn't reset to\norig_val thus it causes a race that the pcluster reuses unexpectedly\nbefore freeing.\nSince UP platforms are quite rare now, such path becomes unnecessary.\nLet's drop such specific-designed path directly instead.", "A vulnerability was found in the Linux kernel, involving a group of functions that handle the pcluster on uni processor (UP) machines. Due to improper handling of the refcount in the pcluster memory, this can lead to a use-after-free scenario, causing memory corruption or crashes."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2022-48674", "package_state": [{"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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-48674\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-48674\nhttps://lore.kernel.org/linux-cve-announce/2024050318-CVE-2022-48674-b876@gregkh/T"], "statement": "Red Hat Enterprise Linux is not impacted by this CVE, as this vulnerability does not affect the specific versions or configurations of the Linux kernel used in its distributions. This ensures that users of Red Hat Enterprise Linux are not exposed to the potential risks associated with this issue and no further action or mitigation is necessary for systems running this operating system.", "threat_severity": "Moderate"}

{}