{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49425", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T02:08:31.569Z", "datePublished": "2025-02-26T02:12:46.702Z", "dateUpdated": "2026-08-05T08:55:10.701Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:55:10.701Z" }, "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." } ], "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/f2fs/segment.c" ], "versions": [ { "version": "8c242db9b8c01b252290e23827163787f07e01d1", "lessThan": "385edd3ce5b4b1e9d31f474a5e35a39779ec1110", "status": "affected", "versionType": "git" }, { "version": "8c242db9b8c01b252290e23827163787f07e01d1", "lessThan": "5e47a7add3dda7f236548c5ec3017776dc2a729f", "status": "affected", "versionType": "git" }, { "version": "8c242db9b8c01b252290e23827163787f07e01d1", "lessThan": "51d584704d18e60fa473823654f35611c777b291", "status": "affected", "versionType": "git" }, { "version": "8c242db9b8c01b252290e23827163787f07e01d1", "lessThan": "45b2b7d7108ae1e25a5036cab04ab9273e792332", "status": "affected", "versionType": "git" }, { "version": "8c242db9b8c01b252290e23827163787f07e01d1", "lessThan": "b26e1c777890e4b938136deb8ec07a29f33862e4", "status": "affected", "versionType": "git" }, { "version": "8c242db9b8c01b252290e23827163787f07e01d1", "lessThan": "ed7efc472c00986dcd6903ab6ed165c7fa167674", "status": "affected", "versionType": "git" }, { "version": "8c242db9b8c01b252290e23827163787f07e01d1", "lessThan": "2aaf51dd39afb6d01d13f1e6fe20b684733b37d5", "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/segment.c" ], "versions": [ { "version": "4.12", "status": "affected" }, { "version": "0", "lessThan": "4.12", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.247", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.198", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.121", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.46", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17.14", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18.3", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19", "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": "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" } ] } ] } ], "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" } ], "title": "f2fs: fix dereference of stale list iterator after loop body", "x_generator": { "engine": "bippy-1.2.0" } } } }