386 lines
20 KiB
JSON
386 lines
20 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-41015",
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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": "2024-07-12T12:17:45.612Z",
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"datePublished": "2024-07-29T06:37:01.651Z",
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"dateUpdated": "2026-08-05T11:34:41.032Z"
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},
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"dateUpdated": "2026-08-05T11:34:41.032Z"
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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\nocfs2: add bounds checking to ocfs2_check_dir_entry()\n\nThis adds sanity checks for ocfs2_dir_entry to make sure all members of\nocfs2_dir_entry don't stray beyond valid memory region."
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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 - Reaching `ocfs2_check_dir_entry()`/`ocfs2_search_dirblock()` requires a crafted OCFS2 volume to be present locally (loop-mounted image file or an attached block device/USB stick) and then touched with an ordinary path-walk or `getdents()`; ocfs2 directory parsing is not exposed by any remote protocol handler.\nAC:L - The attacker authors the on-disk dirents, and `rec_len` is an unvalidated `__le16` that the scan loop only rejects when zero, so `de_buf` can be steered to any byte offset (including `b_data + blocksize - 1`) and the out-of-bounds header read in `ocfs2_match()` fires deterministically on the first `stat()`/`readdir()` — no race, no memory-layout luck, and no non-default kernel config.\nPR:L - An unprivileged local user supplies the poisoned image (a file for loop-mount, or removable media handled by udisks2/systemd automount) and then triggers the path with plain unprivileged `open()`/`stat()`/`readdir()`/`rename()` on the crafted directory; the attacker needs no capability of their own.\nUI:N - On the common desktop/kiosk/embedded deployment the attacker-supplied device is mounted automatically by the automount daemon, and the attacking process itself then issues the syscall that walks the malformed directory — no deliberate action by another user is required.\nS:U - The out-of-bounds accesses and the resulting metadata corruption stay inside the kernel's own memory and security authority; no VM, IOMMU, container, or sandbox boundary is crossed.\nC:H - `ocfs2_match()` reads `de->inode`, `de->name_len` and `memcmp()`s the name up to ~12 bytes past the end of the page-cache block buffer, and `ocfs2_check_dir_entry()`'s `mlog(ML_ERROR, …)` then prints that out-of-bounds `de->inode` verbatim into the kernel log, while the match/no-match result forms a byte-granular oracle over adjacent kernel memory; for inline dirs the missing `i_size` bound also lets `dir_emit()` hand bytes from beyond the valid region to userspace.\nI:H - Dirents that stray outside the valid region pass validation and are then written in place — `le16_add_cpu(&pde->rec_len, …)` and `de->inode = 0` in `__ocfs2_delete_entry()`, `de->inode`/`file_type` in `ocfs2_update_entry()`, and `de1->rec_len`/`de->name_len`/`memcpy(de->name, name, namelen)` in `__ocfs2_add_entry()` — through unaligned pointers whose offsets are derived from out-of-bounds-read `rec_len`/`name_len`, giving attacker-controlled writes outside the region the code believes it owns.\nA:H - The read past a block buffer that can be a full page reliably trips KASAN and can fault on an unmapped adjacent page (DEBUG_PAGEALLOC, highmem/kmap, sparsemem section edge), producing an oops, and the `BUG_ON((char *)de >= (size + data_start))` in `__ocfs2_add_entry()` becomes reachable for inline-data dirs because the old check bounded against the block rather than `i_size` — a kernel BUG taken with the journal handle and inode locks held; the trigger is repeatable on demand."
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}
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]
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}
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],
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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