CVE-2021-47335

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mount_bdev+0x26c/0x3a0 fs/super.c:1367\n legacy_get_tree+0xea/0x180 fs/fs_context.c:592\n vfs_get_tree+0x86/0x270 fs/super.c:1497\n do_new_mount fs/namespace.c:2905 [inline]\n path_mount+0x196f/0x2be0 fs/namespace.c:3235\n do_mount fs/namespace.c:3248 [inline]\n __do_sys_mount fs/namespace.c:3456 [inline]\n __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3433\n do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nThe root cause is multi f2fs filesystem instances can race on accessing\nglobal fsync_entry_slab pointer, result in use-after-free issue of slab\ncache, fixes to init/destroy this slab cache only once during module\ninit/destroy procedure to avoid this issue."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/f2fs/f2fs.h", "fs/f2fs/recovery.c", "fs/f2fs/super.c"], "versions": [{"version": 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fs/super.c:1497\n do_new_mount fs/namespace.c:2905 [inline]\n path_mount+0x196f/0x2be0 fs/namespace.c:3235\n do_mount fs/namespace.c:3248 [inline]\n __do_sys_mount fs/namespace.c:3456 [inline]\n __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3433\n do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nThe root cause is multi f2fs filesystem instances can race on accessing\nglobal fsync_entry_slab pointer, result in use-after-free issue of slab\ncache, fixes to init/destroy this slab cache only once during module\ninit/destroy procedure to avoid this issue."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.51", "versionStartIncluding": "3.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.12.18", "versionStartIncluding": "3.8"}, {"criteria": 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/f2fs/f2fs.h", "fs/f2fs/recovery.c", "fs/f2fs/super.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "86786603014e0a22d0d6af8e80ae4b8687927048", "status": "affected", "version": "d624c96fb3249e5d3dcf4e60a805e5e6b0dd7d91", "versionType": "git"}, {"lessThan": "79fa5d944c875711253a23b8155b36883c696409", "status": "affected", "version": "d624c96fb3249e5d3dcf4e60a805e5e6b0dd7d91", "versionType": "git"}, {"lessThan": "e472b276a0d2180808009be38105e12754432e2a", "status": "affected", "version": "d624c96fb3249e5d3dcf4e60a805e5e6b0dd7d91", "versionType": "git"}, {"lessThan": "cad83c968c2ebe97905f900326988ed37146c347", "status": "affected", "version": "d624c96fb3249e5d3dcf4e60a805e5e6b0dd7d91", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/f2fs/f2fs.h", "fs/f2fs/recovery.c", "fs/f2fs/super.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.8"}, {"lessThan": "3.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.51", "versionType": "semver"}, {"lessThanOrEqual": "5.12.*", "status": "unaffected", "version": "5.12.18", "versionType": "semver"}, {"lessThanOrEqual": "5.13.*", "status": "unaffected", "version": "5.13.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.14", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C79CF5C2-DB53-4AFE-BC5F-8320297112A1", "versionEndExcluding": "5.10.51", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "79D13C82-E06F-4A70-A3D1-C09494FBC94D", "versionEndExcluding": "5.12.18", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "853187F6-707A-487B-95C0-621B5211B43C", "versionEndExcluding": "5.13.3", "versionStartIncluding": "5.13", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid racing on fsync_entry_slab by multi filesystem instances\n\nAs syzbot reported, there is an use-after-free issue during f2fs recovery:\n\nUse-after-free write at 0xffff88823bc16040 (in kfence-#10):\n kmem_cache_destroy+0x1f/0x120 mm/slab_common.c:486\n f2fs_recover_fsync_data+0x75b0/0x8380 fs/f2fs/recovery.c:869\n f2fs_fill_super+0x9393/0xa420 fs/f2fs/super.c:3945\n mount_bdev+0x26c/0x3a0 fs/super.c:1367\n legacy_get_tree+0xea/0x180 fs/fs_context.c:592\n vfs_get_tree+0x86/0x270 fs/super.c:1497\n do_new_mount fs/namespace.c:2905 [inline]\n path_mount+0x196f/0x2be0 fs/namespace.c:3235\n do_mount fs/namespace.c:3248 [inline]\n __do_sys_mount fs/namespace.c:3456 [inline]\n __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3433\n do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nThe root cause is multi f2fs filesystem instances can race on accessing\nglobal fsync_entry_slab pointer, result in use-after-free issue of slab\ncache, fixes to init/destroy this slab cache only once during module\ninit/destroy procedure to avoid this issue."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: f2fs: soluci\u00f3n para evitar ejecuci\u00f3nes en fsync_entry_slab por instancias de m\u00faltiples sistemas de archivos. Como inform\u00f3 syzbot, hay un problema de use after free durante la recuperaci\u00f3n de f2fs: escritura de use after free en 0xffff88823bc16040 ( en kfence-#10): kmem_cache_destroy+0x1f/0x120 mm/slab_common.c:486 f2fs_recover_fsync_data+0x75b0/0x8380 fs/f2fs/recovery.c:869 f2fs_fill_super+0x9393/0xa420 fs/f2fs/super.c:3945 _bdev+0x26c /0x3a0 fs/super.c:1367 Legacy_get_tree+0xea/0x180 fs/fs_context.c:592 vfs_get_tree+0x86/0x270 fs/super.c:1497 do_new_mount fs/namespace.c:2905 [en l\u00ednea] path_mount+0x196f/0x2be0 fs /namespace.c:3235 do_mount fs/namespace.c:3248 [en l\u00ednea] __do_sys_mount fs/namespace.c:3456 [en l\u00ednea] __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3433 do_syscall_64+0x3f/0xb0 arch/x86/entry /common.c:47 Entry_SYSCALL_64_after_hwframe+0x44/0xae La causa principal es que varias instancias del sistema de archivos f2fs pueden acelerarse al acceder al puntero global fsync_entry_slab, lo que resulta en un problema de use after free del cach\u00e9 de slab, se corrige para iniciar/destruir este cach\u00e9 de slab solo una vez durante procedimiento de inicio/destrucci\u00f3n del m\u00f3dulo para evitar este problema."}], "id": "CVE-2021-47335", "lastModified": "2026-08-11T03:17:20.253", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47335", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-21T17:39:39.785256Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:20.350", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/79fa5d944c875711253a23b8155b36883c696409"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/86786603014e0a22d0d6af8e80ae4b8687927048"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cad83c968c2ebe97905f900326988ed37146c347"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e472b276a0d2180808009be38105e12754432e2a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/79fa5d944c875711253a23b8155b36883c696409"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/86786603014e0a22d0d6af8e80ae4b8687927048"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cad83c968c2ebe97905f900326988ed37146c347"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e472b276a0d2180808009be38105e12754432e2a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: f2fs: fix to avoid racing on fsync_entry_slab by multi filesystem instances", "id": "2282425", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282425"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nf2fs: fix to avoid racing on fsync_entry_slab by multi filesystem instances\nAs syzbot reported, there is an use-after-free issue during f2fs recovery:\nUse-after-free write at 0xffff88823bc16040 (in kfence-#10):\nkmem_cache_destroy+0x1f/0x120 mm/slab_common.c:486\nf2fs_recover_fsync_data+0x75b0/0x8380 fs/f2fs/recovery.c:869\nf2fs_fill_super+0x9393/0xa420 fs/f2fs/super.c:3945\nmount_bdev+0x26c/0x3a0 fs/super.c:1367\nlegacy_get_tree+0xea/0x180 fs/fs_context.c:592\nvfs_get_tree+0x86/0x270 fs/super.c:1497\ndo_new_mount fs/namespace.c:2905 [inline]\npath_mount+0x196f/0x2be0 fs/namespace.c:3235\ndo_mount fs/namespace.c:3248 [inline]\n__do_sys_mount fs/namespace.c:3456 [inline]\n__se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3433\ndo_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47\nentry_SYSCALL_64_after_hwframe+0x44/0xae\nThe root cause is multi f2fs filesystem instances can race on accessing\nglobal fsync_entry_slab pointer, result in use-after-free issue of slab\ncache, fixes to init/destroy this slab cache only once during module\ninit/destroy procedure to avoid this issue."], "name": "CVE-2021-47335", "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": "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": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47335\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47335"], "threat_severity": "Moderate"}

{}