{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-47335","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-21T14:28:16.977Z","datePublished":"2024-05-21T14:35:45.093Z","dateUpdated":"2025-07-11T17:19:01.075Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-07-11T17:19:01.075Z"},"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."}],"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":"98e4da8ca301e062d79ae168c67e56f3c3de3ce4","lessThan":"86786603014e0a22d0d6af8e80ae4b8687927048","status":"affected","versionType":"git"},{"version":"98e4da8ca301e062d79ae168c67e56f3c3de3ce4","lessThan":"79fa5d944c875711253a23b8155b36883c696409","status":"affected","versionType":"git"},{"version":"98e4da8ca301e062d79ae168c67e56f3c3de3ce4","lessThan":"e472b276a0d2180808009be38105e12754432e2a","status":"affected","versionType":"git"},{"version":"98e4da8ca301e062d79ae168c67e56f3c3de3ce4","lessThan":"cad83c968c2ebe97905f900326988ed37146c347","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/f2fs/f2fs.h","fs/f2fs/recovery.c","fs/f2fs/super.c"],"versions":[{"version":"3.8","status":"affected"},{"version":"0","lessThan":"3.8","status":"unaffected","versionType":"semver"},{"version":"5.10.51","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.12.18","lessThanOrEqual":"5.12.*","status":"unaffected","versionType":"semver"},{"version":"5.13.3","lessThanOrEqual":"5.13.*","status":"unaffected","versionType":"semver"},{"version":"5.14","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":"3.8","versionEndExcluding":"5.10.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"5.12.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"5.13.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"5.14"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/86786603014e0a22d0d6af8e80ae4b8687927048"},{"url":"https://git.kernel.org/stable/c/79fa5d944c875711253a23b8155b36883c696409"},{"url":"https://git.kernel.org/stable/c/e472b276a0d2180808009be38105e12754432e2a"},{"url":"https://git.kernel.org/stable/c/cad83c968c2ebe97905f900326988ed37146c347"}],"title":"f2fs: fix to avoid racing on fsync_entry_slab by multi filesystem instances","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-47335","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-05-21T17:39:39.785256Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-06-04T17:15:03.198Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:32:08.535Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/86786603014e0a22d0d6af8e80ae4b8687927048","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/79fa5d944c875711253a23b8155b36883c696409","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/e472b276a0d2180808009be38105e12754432e2a","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/cad83c968c2ebe97905f900326988ed37146c347","tags":["x_transferred"]}]}]}}