CVE-2022-49425

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Reachable only via local f2fs atomic-write ioctls and pagecache invalidate/truncate on an f2fs inode (F2FS_IOC_START_ATOMIC_WRITE \u2192 dirty \u2192 f2fs_invalidate_folio \u2192 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"}}}}

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Desreferenciarlo (cur->page en este caso) podr\u00eda cargar un valor fuera de los l\u00edmites/indefinido, lo que hace que no sea seguro usarlo en la comparaci\u00f3n para determinar si se encontr\u00f3 el elemento espec\u00edfico. Dado que 'cur->page' *puede* estar fuera de los l\u00edmites, no se puede garantizar que por casualidad (o intenci\u00f3n de un atacante) coincida con el valor de 'page' aunque no se haya encontrado el elemento correcto. Esto se soluciona utilizando una variable de iterador de lista separada para el bucle y solo configurando la variable original si se encontr\u00f3 un elemento adecuado. Luego, determinar si se encontr\u00f3 el elemento es simplemente verificar si la variable est\u00e1 configurada."}], "id": "CVE-2022-49425", "lastModified": "2026-08-04T10:17:47.933", "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": 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"}]}, "published": "2025-02-26T07:01:18.977", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2aaf51dd39afb6d01d13f1e6fe20b684733b37d5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/385edd3ce5b4b1e9d31f474a5e35a39779ec1110"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/45b2b7d7108ae1e25a5036cab04ab9273e792332"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/51d584704d18e60fa473823654f35611c777b291"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5e47a7add3dda7f236548c5ec3017776dc2a729f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b26e1c777890e4b938136deb8ec07a29f33862e4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ed7efc472c00986dcd6903ab6ed165c7fa167674"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: f2fs: fix dereference of stale list iterator after loop body", "id": "2347696", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2347696"}, "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:\nf2fs: fix dereference of stale list iterator after loop body\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.\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.\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."], "name": "CVE-2022-49425", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "2025-02-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49425\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49425\nhttps://lore.kernel.org/linux-cve-announce/2025022655-CVE-2022-49425-05aa@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-13T21:07:28.787966+00:00", "updated": "2025-07-13T21:07:28.788044+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}