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vuln-cve/data/2024/39xxx/CVE-2024-39469.json
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"cveId": "CVE-2024-39469",
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"dateReserved": "2024-06-25T14:23:23.745Z",
"datePublished": "2024-06-25T14:28:55.581Z",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix nilfs_empty_dir() misjudgment and long loop on I/O errors\n\nThe error handling in nilfs_empty_dir() when a directory folio/page read\nfails is incorrect, as in the old ext2 implementation, and if the\nfolio/page cannot be read or nilfs_check_folio() fails, it will falsely\ndetermine the directory as empty and corrupt the file system.\n\nIn addition, since nilfs_empty_dir() does not immediately return on a\nfailed folio/page read, but continues to loop, this can cause a long loop\nwith I/O if i_size of the directory's inode is also corrupted, causing the\nlog writer thread to wait and hang, as reported by syzbot.\n\nFix these issues by making nilfs_empty_dir() immediately return a false\nvalue (0) if it fails to get a directory folio/page."
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"value": "AV:L - The vulnerable code is reached through the local `rmdir(2)`/`rename(2)` syscall path on a mounted nilfs2 filesystem, with the malicious directory state supplied by a crafted nilfs2 image (automounted removable media, loop-mounted file, or admin-mounted volume). No network protocol handler is involved in the vulnerable function itself.\nAC:L - The attacker fully controls the on-disk directory: setting a corrupt `rec_len`/alignment/inode number so `nilfs_check_folio()` deterministically fails, and setting a huge `i_size` (read unvalidated at `inode.c:412`) so `dir_pages()` yields ~2^51 iterations. Both the false \"empty\" verdict and the segctor-sem hang follow deterministically with no race, timing window, or memory-layout dependency.\nPR:L - Once the filesystem is mounted, any ordinary unprivileged local user with write access to a directory on it triggers the bug with a single `rmdir()` or `rename()` — no capability, no root, and no `CAP_SYS_ADMIN` is needed for the triggering syscall itself.\nUI:N - No action by a second user is required: on a kiosk, desktop, or embedded system with udisks2/systemd automount, inserting the crafted volume is performed by the attacker and mounting is done by a daemon, after which the attacker issues the `rmdir()` themselves.\nS:U - The damage — corrupted nilfs2 metadata and a wedged log-writer thread — stays entirely within the kernel's own security authority on the affected host; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The defect is an incorrect boolean return, not a memory-safety violation: `nilfs_check_folio()` still bounds every entry walk, and the `fail:` label in `nilfs_get_folio()` already releases the folio, so there is no out-of-bounds read, no use-after-free, and no kernel pointer or adjacent-memory disclosure.\nI:H - The false \"directory is empty\" verdict lets `nilfs_rmdir()` unlink a populated directory (`i_size = 0`, `drop_nlink()`) and lets `nilfs_rename()` overwrite one, orphaning the entire subtree and, as the fix states, corrupting the file system — silent, unauthorized destruction of stored data and metadata that the kernel then continues to operate on.\nA:H - With a corrupted `i_size` the loop performs an effectively unbounded sequence of failing reads with no `cond_resched()` or signal check while holding `ns_segctor_sem` for read and `sb_start_intwrite()`, so the segctord log writer blocks forever on `down_write()` — the syzbot hung-task hang — stalling all writeback, sync, freeze, and umount on that filesystem and panicking the box if `hung_task_panic` is set."
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