448 lines
22 KiB
JSON
448 lines
22 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2023-52444",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-02-20T12:30:33.291Z",
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"datePublished": "2024-02-22T16:21:37.043Z",
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"dateUpdated": "2026-10-15T00:16:56.306Z"
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},
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"containers": {
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T09:10:00.972Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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]"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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