{"id":"CVE-2022-49425","state":"PUBLISHED","title":"f2fs: fix dereference of stale list iterator after loop body","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix dereference of stale list iterator after loop body\n\nThe list iterator variable will be a bogus pointer if no break was hit.\nDereferencing it (cur->page in this case) could load an out-of-bounds/undefined\nvalue making it unsafe to use that in the comparision to determine if the\nspecific element was found.\n\nSince 'cur->page' *can* be out-ouf-bounds it cannot be guaranteed that\nby chance (or intention of an attacker) it matches the value of 'page'\neven though the correct element was not found.\n\nThis is fixed by using a separate list iterator variable for the loop\nand only setting the original variable if a suitable element was found.\nThen determing if the element was found is simply checking if the\nvariable is set.","publishedAt":"2025-02-26T02:12:46.702Z","updatedAt":"2026-08-05T08:55:10.701Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8c242db9b8c01b252290e23827163787f07e01d1","status":"affected","lessThan":"385edd3ce5b4b1e9d31f474a5e35a39779ec1110","versionType":"git"},{"version":"8c242db9b8c01b252290e23827163787f07e01d1","status":"affected","lessThan":"5e47a7add3dda7f236548c5ec3017776dc2a729f","versionType":"git"},{"version":"8c242db9b8c01b252290e23827163787f07e01d1","status":"affected","lessThan":"51d584704d18e60fa473823654f35611c777b291","versionType":"git"},{"version":"8c242db9b8c01b252290e23827163787f07e01d1","status":"affected","lessThan":"45b2b7d7108ae1e25a5036cab04ab9273e792332","versionType":"git"},{"version":"8c242db9b8c01b252290e23827163787f07e01d1","status":"affected","lessThan":"b26e1c777890e4b938136deb8ec07a29f33862e4","versionType":"git"},{"version":"8c242db9b8c01b252290e23827163787f07e01d1","status":"affected","lessThan":"ed7efc472c00986dcd6903ab6ed165c7fa167674","versionType":"git"},{"version":"8c242db9b8c01b252290e23827163787f07e01d1","status":"affected","lessThan":"2aaf51dd39afb6d01d13f1e6fe20b684733b37d5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/segment.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.12","versionType":"semver"},{"version":"4.19.247","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.198","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.121","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.46","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.17.14","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18.3","status":"unaffected","lessThanOrEqual":"5.18.*","versionType":"semver"},{"version":"5.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/segment.c"]}],"references":["https://git.kernel.org/stable/c/385edd3ce5b4b1e9d31f474a5e35a39779ec1110","https://git.kernel.org/stable/c/5e47a7add3dda7f236548c5ec3017776dc2a729f","https://git.kernel.org/stable/c/51d584704d18e60fa473823654f35611c777b291","https://git.kernel.org/stable/c/45b2b7d7108ae1e25a5036cab04ab9273e792332","https://git.kernel.org/stable/c/b26e1c777890e4b938136deb8ec07a29f33862e4","https://git.kernel.org/stable/c/ed7efc472c00986dcd6903ab6ed165c7fa167674","https://git.kernel.org/stable/c/2aaf51dd39afb6d01d13f1e6fe20b684733b37d5"],"weaknesses":[],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/49xxx/CVE-2022-49425.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49425","state":"PUBLISHED","datePublished":"2025-02-26T02:12:46.702Z","dateUpdated":"2026-08-05T08:55:10.701Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-02-26T02:08:31.569Z"},"containers":{"cna":{"title":"f2fs: fix dereference of stale list iterator after loop body","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix dereference of stale list iterator after loop body\n\nThe list iterator variable will be a bogus pointer if no break was hit.\nDereferencing it (cur->page in this case) could load an out-of-bounds/undefined\nvalue making it unsafe to use that in the comparision to determine if the\nspecific element was found.\n\nSince 'cur->page' *can* be out-ouf-bounds it cannot be guaranteed that\nby chance (or intention of an attacker) it matches the value of 'page'\neven though the correct element was not found.\n\nThis is fixed by using a separate list iterator variable for the loop\nand only setting the original variable if a suitable element was found.\nThen determing if the element was found is simply checking if the\nvariable is set."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8c242db9b8c01b252290e23827163787f07e01d1","status":"affected","lessThan":"385edd3ce5b4b1e9d31f474a5e35a39779ec1110","versionType":"git"},{"version":"8c242db9b8c01b252290e23827163787f07e01d1","status":"affected","lessThan":"5e47a7add3dda7f236548c5ec3017776dc2a729f","versionType":"git"},{"version":"8c242db9b8c01b252290e23827163787f07e01d1","status":"affected","lessThan":"51d584704d18e60fa473823654f35611c777b291","versionType":"git"},{"version":"8c242db9b8c01b252290e23827163787f07e01d1","status":"affected","lessThan":"45b2b7d7108ae1e25a5036cab04ab9273e792332","versionType":"git"},{"version":"8c242db9b8c01b252290e23827163787f07e01d1","status":"affected","lessThan":"b26e1c777890e4b938136deb8ec07a29f33862e4","versionType":"git"},{"version":"8c242db9b8c01b252290e23827163787f07e01d1","status":"affected","lessThan":"ed7efc472c00986dcd6903ab6ed165c7fa167674","versionType":"git"},{"version":"8c242db9b8c01b252290e23827163787f07e01d1","status":"affected","lessThan":"2aaf51dd39afb6d01d13f1e6fe20b684733b37d5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/segment.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.12","versionType":"semver"},{"version":"4.19.247","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.198","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.121","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.46","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.17.14","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18.3","status":"unaffected","lessThanOrEqual":"5.18.*","versionType":"semver"},{"version":"5.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/segment.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/385edd3ce5b4b1e9d31f474a5e35a39779ec1110"},{"url":"https://git.kernel.org/stable/c/5e47a7add3dda7f236548c5ec3017776dc2a729f"},{"url":"https://git.kernel.org/stable/c/51d584704d18e60fa473823654f35611c777b291"},{"url":"https://git.kernel.org/stable/c/45b2b7d7108ae1e25a5036cab04ab9273e792332"},{"url":"https://git.kernel.org/stable/c/b26e1c777890e4b938136deb8ec07a29f33862e4"},{"url":"https://git.kernel.org/stable/c/ed7efc472c00986dcd6903ab6ed165c7fa167674"},{"url":"https://git.kernel.org/stable/c/2aaf51dd39afb6d01d13f1e6fe20b684733b37d5"}],"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 - Reachable only via local f2fs atomic-write ioctls and pagecache invalidate/truncate on an f2fs inode (F2FS_IOC_START_ATOMIC_WRITE → dirty → f2fs_invalidate_folio → f2fs_drop_inmem_page); not via network protocol handlers.\nAC:L - An unprivileged local attacker fully controls the atomic-write, write, and truncate/invalidate sequence on their own file and can drive the drop path directly; no attacker-independent timing or rare hardware state is required.\nPR:L - F2FS_IOC_START_ATOMIC_WRITE only needs inode_owner_or_capable, so any unprivileged user who owns a file on a mounted f2fs volume (common on Android userdata) can enter the path without real root.\nUI:N - On typical f2fs deployments the filesystem is already mounted; the attacker triggers the bug with their own ioctl/write/truncate and needs no separate victim action.\nS:U - Impact is kernel memory corruption within the host f2fs/pagecache authority and does not cross VM, IOMMU, or other security boundaries.\nC:H - On the not-found path the stale iterator aliases into f2fs_inode_info; continuing to kmem_cache_free that address corrupts slab freelists, which is leveragable for arbitrary kernel read primitives.\nI:H - list_del on the bogus inmem_pages object and kmem_cache_free of a non-slab inode-interior pointer yield heap corruption exploitable for arbitrary write and control-flow hijacking.\nA:H - The same path can BUG_ON/WARN then fault in list_del/slab free, or panic from corrupted freelists, so availability impact is a kernel oops/panic."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T08:55:10.701Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"4.19.247"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"5.4.198"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"5.10.121"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"5.15.46"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"5.17.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"5.18.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"5.19"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}