{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2023-52444", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-20T12:30:33.291Z", "datePublished": "2024-02-22T16:21:37.043Z", "dateUpdated": "2026-08-05T09:10:00.972Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:10:00.972Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid dirent corruption\n\nAs Al reported in link[1]:\n\nf2fs_rename()\n...\n\tif (old_dir != new_dir && !whiteout)\n\t\tf2fs_set_link(old_inode, old_dir_entry,\n\t\t\t\t\told_dir_page, new_dir);\n\telse\n\t\tf2fs_put_page(old_dir_page, 0);\n\nYou want correct inumber in the \"..\" link. And cross-directory\nrename does move the source to new parent, even if you'd been asked\nto leave a whiteout in the old place.\n\n[1] https://lore.kernel.org/all/20231017055040.GN800259@ZenIV/\n\nWith below testcase, it may cause dirent corruption, due to it missed\nto call f2fs_set_link() to update \"..\" link to new directory.\n- mkdir -p dir/foo\n- renameat2 -w dir/foo bar\n\n[ASSERT] (__chk_dots_dentries:1421) --> Bad inode number[0x4] for '..', parent parent ino is [0x3]\n[FSCK] other corrupted bugs [Fail]" } ], "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 defect is in f2fs_rename(), reached only via local rename/renameat2 (or overlayfs upper-layer RENAME_WHITEOUT on an f2fs upper) through vfs_rename(); it is not reachable from network packet processing.\nAC:L - The attacker deterministically triggers the bug with mkdir and renameat2(RENAME_WHITEOUT) across directories (or by driving overlay whiteout renames); no race or attacker-uncontrollable condition is required.\nPR:L - Only ordinary DAC write/rename permission on directories of an already-mounted f2fs volume is required; RENAME_WHITEOUT has no capability gate and is usable by unprivileged users (including via overlay in user namespaces).\nUI:N - On the highest-severity realistic deployment (Android/embedded f2fs userdata, or f2fs used as overlay upper) the filesystem is already mounted; the attacker triggers the rename path entirely with their own syscalls.\nS:U - Impact is confined to on-disk f2fs directory metadata and same-host exportfs/NFS parent resolution within one OS security authority; there is no VM, IOMMU, or sandbox boundary escape.\nC:H - Stale or dangling \"..\" is what f2fs_get_parent reads for exportfs/NFS LOOKUPP; after the under-counted old parent is removed, that inumber can be reused so get_parent resolves an unrelated directory, disclosing unintended directory contents (and enabling NFS subtree escape when f2fs is exported).\nI:H - Cross-directory whiteout rename leaves a durable wrong \"..\" dirent while still adjusting parent nlink, creating inconsistent directory metadata that fails fsck and can dangling-reference a removed parent—high-impact on-disk integrity loss analogous to other dirent/\"..\" corruption CVEs.\nA:H - The resulting filesystem corruption fails fsck.f2fs and can break exportfs reconnect / yield -EFSCORRUPTED on bad parent iget; on Android/embedded userdata this is durable volume availability loss requiring repair or wipe." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/f2fs/namei.c" ], "versions": [ { "version": "7e01e7ad746bc8198a8b46163ddc73a1c7d22339", "lessThan": "02160112e6d45c2610b049df6eb693d7a2e57b46", "status": "affected", "versionType": "git" }, { "version": "7e01e7ad746bc8198a8b46163ddc73a1c7d22339", "lessThan": "5624a3c1b1ebc8991318e1cce2aa719542991024", "status": "affected", "versionType": "git" }, { "version": "7e01e7ad746bc8198a8b46163ddc73a1c7d22339", "lessThan": "6f866885e147d33efc497f1095f35b2ee5ec7310", "status": "affected", "versionType": "git" }, { "version": "7e01e7ad746bc8198a8b46163ddc73a1c7d22339", "lessThan": "f100ba617d8be6c98a68f3744ef7617082975b77", "status": "affected", "versionType": "git" }, { "version": "7e01e7ad746bc8198a8b46163ddc73a1c7d22339", "lessThan": "f0145860c20be6bae6785c7a2249577674702ac7", "status": "affected", "versionType": "git" }, { "version": "7e01e7ad746bc8198a8b46163ddc73a1c7d22339", "lessThan": "d3c0b49aaa12a61d560528f5d605029ab57f0728", "status": "affected", "versionType": "git" }, { "version": "7e01e7ad746bc8198a8b46163ddc73a1c7d22339", "lessThan": "2fb4867f4405aea8c0519d7d188207f232a57862", "status": "affected", "versionType": "git" }, { "version": "7e01e7ad746bc8198a8b46163ddc73a1c7d22339", "lessThan": "53edb549565f55ccd0bdf43be3d66ce4c2d48b28", "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/namei.c" ], "versions": [ { "version": "4.2", "status": "affected" }, { "version": "0", "lessThan": "4.2", "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": "6.1.75", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.14", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.2", "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": "4.2", "versionEndExcluding": "4.19.306" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "5.4.268" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "5.10.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "5.15.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.1.75" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.6.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.7.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/02160112e6d45c2610b049df6eb693d7a2e57b46" }, { "url": "https://git.kernel.org/stable/c/5624a3c1b1ebc8991318e1cce2aa719542991024" }, { "url": "https://git.kernel.org/stable/c/6f866885e147d33efc497f1095f35b2ee5ec7310" }, { "url": "https://git.kernel.org/stable/c/f100ba617d8be6c98a68f3744ef7617082975b77" }, { "url": "https://git.kernel.org/stable/c/f0145860c20be6bae6785c7a2249577674702ac7" }, { "url": "https://git.kernel.org/stable/c/d3c0b49aaa12a61d560528f5d605029ab57f0728" }, { "url": "https://git.kernel.org/stable/c/2fb4867f4405aea8c0519d7d188207f232a57862" }, { "url": "https://git.kernel.org/stable/c/53edb549565f55ccd0bdf43be3d66ce4c2d48b28" } ], "title": "f2fs: fix to avoid dirent corruption", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2023-52444", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-02-26T17:55:52.107706Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-07-05T17:21:03.571Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", 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