{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-39469", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-25T14:23:23.745Z", "datePublished": "2024-06-25T14:28:55.581Z", "dateUpdated": "2026-08-05T11:33:27.521Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:33:27.521Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/nilfs2/dir.c" ], "versions": [ { "version": "2ba466d74ed74f073257f86e61519cb8f8f46184", "lessThan": "2ac8a2fe22bdde9eecce2a42cf5cab79333fb428", "status": "affected", "versionType": "git" }, { "version": "2ba466d74ed74f073257f86e61519cb8f8f46184", "lessThan": "405b71f1251e5ae865f53bd27c45114e6c83bee3", "status": "affected", "versionType": "git" }, { "version": "2ba466d74ed74f073257f86e61519cb8f8f46184", "lessThan": "c77ad608df6c091fe64ecb91f41ef7cb465587f1", "status": "affected", "versionType": "git" }, { "version": "2ba466d74ed74f073257f86e61519cb8f8f46184", "lessThan": "11a2edb70356a2202dcb7c9c189c8356ab4752cd", "status": "affected", "versionType": "git" }, { "version": "2ba466d74ed74f073257f86e61519cb8f8f46184", "lessThan": "129dcd3e7d036218db3f59c82d82004b9539ed82", "status": "affected", "versionType": "git" }, { "version": "2ba466d74ed74f073257f86e61519cb8f8f46184", "lessThan": "d18b05eda7fa77f02114f15b02c009f28ee42346", "status": "affected", "versionType": "git" }, { "version": "2ba466d74ed74f073257f86e61519cb8f8f46184", "lessThan": "59f14875a96ef93f05b82ad3c980605f2cb444b5", "status": "affected", "versionType": "git" }, { "version": "2ba466d74ed74f073257f86e61519cb8f8f46184", "lessThan": "7373a51e7998b508af7136530f3a997b286ce81c", "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/nilfs2/dir.c" ], "versions": [ { "version": "2.6.30", "status": "affected" }, { "version": "0", "lessThan": "2.6.30", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.317", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.279", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.221", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.162", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.95", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.35", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.5", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10", "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": "2.6.30", "versionEndExcluding": "4.19.317" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", 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