{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2023-52436", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-20T12:30:33.290Z", "datePublished": "2024-02-20T18:34:47.387Z", "dateUpdated": "2026-08-15T12:23:45.392Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-15T12:23:45.392Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: explicitly null-terminate the xattr list\n\nWhen setting an xattr, explicitly null-terminate the xattr list. This\neliminates the fragile assumption that the unused xattr space is always\nzeroed." } ], "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 - The vulnerable path is reached via local setxattr/lsetxattr/fsetxattr (or setfacl→ACL xattrs) into f2fs_setxattr/__f2fs_setxattr; it is not reachable from the network stack or remote filesystem servers.\nAC:L - An attacker who can write xattrs on an f2fs inode can reliably invoke the buggy set path; exploitation does not depend on a race or other condition outside the attacker’s influence once residual non-zero unused xattr bytes exist (common on flash/corrupt or previously dirty xattr regions).\nPR:L - user.* xattrs are enabled by default and only require an unprivileged caller with MAY_WRITE on their own file/dir (typical Android app on f2fs userdata); CAP_SYS_ADMIN is not required.\nUI:N - On a system where f2fs is already mounted (e.g., Android /data), the attacker triggers the bug directly via syscalls with no victim action such as mounting a malicious image.\nS:U - Impact stays within the host kernel’s authority (local memory corruption / privilege boundary of the same OS); this is not a VM, IOMMU, or other cross-authority escape.\nC:H - An unterminated xattr list causes out-of-bounds reads while walking entries (historically KASAN slab-OOB in getxattr and leakage via listxattr), which can disclose arbitrary kernel memory when bounds checks are absent or bypassed.\nI:H - Out-of-bounds parsing of attacker-influenced leftover xattr bytes can corrupt adjacent kernel memory and is treated as enabling write/control-flow impact under the overestimate-severity rule for memory-corruption bugs.\nA:H - The same OOB walks have caused kernel page faults/oopses and hard failures in related f2fs xattr corruption bugs, so availability impact is a full kernel crash." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/f2fs/xattr.c" ], "versions": [ { "version": "af48b85b8cd3fbb12c9b6759c16db6d69c0b03da", "lessThan": "16ae3132ff7746894894927c1892493693b89135", "status": "affected", "versionType": "git" }, { "version": "af48b85b8cd3fbb12c9b6759c16db6d69c0b03da", "lessThan": "12cf91e23b126718a96b914f949f2cdfeadc7b2a", "status": "affected", "versionType": "git" }, { "version": "af48b85b8cd3fbb12c9b6759c16db6d69c0b03da", "lessThan": "3e47740091b05ac8d7836a33afd8646b6863ca52", "status": "affected", "versionType": "git" }, { "version": "af48b85b8cd3fbb12c9b6759c16db6d69c0b03da", "lessThan": "32a6cfc67675ee96fe107aeed5af9776fec63f11", "status": "affected", "versionType": "git" }, { "version": "af48b85b8cd3fbb12c9b6759c16db6d69c0b03da", "lessThan": "5de9e9dd1828db9b8b962f7ca42548bd596deb8a", "status": "affected", "versionType": "git" }, { "version": "af48b85b8cd3fbb12c9b6759c16db6d69c0b03da", "lessThan": "2525d1ba225b5c167162fa344013c408e8b4de36", "status": "affected", "versionType": "git" }, { "version": "af48b85b8cd3fbb12c9b6759c16db6d69c0b03da", "lessThan": "f6c30bfe5a49bc38cae985083a11016800708fea", "status": "affected", "versionType": "git" }, { "version": "af48b85b8cd3fbb12c9b6759c16db6d69c0b03da", "lessThan": "e26b6d39270f5eab0087453d9b544189a38c8564", "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/xattr.c" ], "versions": [ { "version": "3.8", "status": "affected" }, { "version": "0", "lessThan": "3.8", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.306", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.268", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.209", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.148", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.74", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.13", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.1", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "4.19.306" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", 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"https://git.kernel.org/stable/c/16ae3132ff7746894894927c1892493693b89135" }, { "url": "https://git.kernel.org/stable/c/12cf91e23b126718a96b914f949f2cdfeadc7b2a" }, { "url": "https://git.kernel.org/stable/c/3e47740091b05ac8d7836a33afd8646b6863ca52" }, { "url": "https://git.kernel.org/stable/c/32a6cfc67675ee96fe107aeed5af9776fec63f11" }, { "url": "https://git.kernel.org/stable/c/5de9e9dd1828db9b8b962f7ca42548bd596deb8a" }, { "url": "https://git.kernel.org/stable/c/2525d1ba225b5c167162fa344013c408e8b4de36" }, { "url": "https://git.kernel.org/stable/c/f6c30bfe5a49bc38cae985083a11016800708fea" }, { "url": "https://git.kernel.org/stable/c/e26b6d39270f5eab0087453d9b544189a38c8564" } ], "title": "f2fs: explicitly null-terminate the xattr list", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2023-52436", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { 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