{"id":"CVE-2023-52444","state":"PUBLISHED","title":"f2fs: fix to avoid dirent corruption","description":"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]","publishedAt":"2024-02-22T16:21:37.043Z","updatedAt":"2026-10-15T00:16:56.306Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux 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fix to avoid dirent corruption","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                           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- 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 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