286 lines
15 KiB
JSON
286 lines
15 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-2025-38707",
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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": "2025-04-16T04:51:24.032Z",
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"datePublished": "2025-09-04T15:32:58.386Z",
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"dateUpdated": "2026-08-05T12:04:08.373Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:04:08.373Z"
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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\nfs/ntfs3: Add sanity check for file name\n\nThe length of the file name should be smaller than the directory entry size."
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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:N/A:H",
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"baseScore": 7.1,
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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 - `ntfs_dir_emit()` is reached only through `ntfs_readdir()` → `ntfs_read_hdr()`, i.e. a local `getdents64(2)` on a directory of an attacker-authored NTFS volume (loop image or removable media); there is no network-facing consumer of fs/ntfs3/dir.c.\nAC:L - `fname->name_len` is a raw on-disk u8 the attacker writes into the index entry, and `ntfs_read_hdr()` only validates `e->size >= 0x10` and `key_size >= 0x44`, so an entry with `e->size = 0x10`, `name_len = 255` placed at the tail of `hdr->used` deterministically overreads ~590 bytes past the `kmalloc(index_block_size)` buffer on the first readdir — no race, no timing window, and adjacent slab contents can be groomed beforehand.\nPR:L - ntfs3 is FS_REQUIRES_DEV without FS_USERNS_MOUNT so a bare `mount(2)` needs CAP_SYS_ADMIN, but in the most severe reasonable deployment an unprivileged local user gets the crafted image mounted via udisks2 loop-setup, desktop/kiosk removable-media automount, or `user`/autofs fstab delegation; the `getdents64` that fires the overread needs no privilege at all.\nUI:N - The attacker performs every step personally — presents the crafted volume, which an automounter consumes with no human action, then runs the directory read itself. No second victim user must be induced to act.\nS:U - The out-of-bounds read happens in ntfs3 name conversion inside the kernel and its effects stay within that same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `ntfs_utf16_to_nls(sbi, fname->name, fname->name_len, ...)` reads up to 510 bytes from `e + 0x52` with no bound tied to `e->size`, walking off the end of the `kmalloc(bytes)` INDEX_BUFFER (or the `kmalloc(sbi->record_size)` MFT record) into neighbouring slab objects, and every harvested byte is handed to `dir_emit()` and returned to userspace as a filename — a repeatable, attacker-length-controlled kernel heap disclosure primitive usable to defeat KASLR and lift secrets from groomed adjacent objects.\nI:N - The defect is strictly a read overrun; stores into the PATH_MAX `name` buffer stay bounded by `buf_len`/`utf16s_to_utf8s()` maxout with `NTFS_NAME_LEN * 4 < PATH_MAX` statically asserted, so no kernel memory is modified.\nA:H - The multi-hundred-byte overread can run off the end of the page-backed index buffer into unmapped memory, faulting inside `iterate_dir()` while the inode rwsem is held and wedging the filesystem; under KASAN, SLUB_DEBUG, or debug_pagealloc it faults immediately (this is exactly how syzbot hit it), and with panic_on_oops it is a full panic the attacker can repeat at will."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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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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"programFiles": [
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"fs/ntfs3/dir.c"
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],
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"versions": [
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"version": "4534a70b7056fd4b9a1c6db5a4ce3c98546b291e",
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"lessThan": "bde58c1539f3ffddffc94d64007de16964e6b8eb",
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"status": "affected",
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"programFiles": [
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"fs/ntfs3/dir.c"
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{
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"status": "affected"
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"version": "0",
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"status": "unaffected",
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{
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"version": "5.15.190",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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"version": "6.6.103",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"version": "6.12.43",
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"lessThanOrEqual": "6.12.*",
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"version": "6.15.11",
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"lessThanOrEqual": "6.15.*",
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"version": "6.16.2",
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"lessThanOrEqual": "6.16.*",
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"status": "unaffected",
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"versionType": "semver"
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{
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"version": "6.17",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
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