CVE-2026-72478
Description
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: add bounds check to run_get_highest_vcn() run_get_highest_vcn() parses a packed NTFS mapping-pairs buffer without any length bound, relying solely on a 0x00 terminator to stop. A crafted $LogFile UpdateMappingPairs record whose embedded attribute contains mapping-pairs runs without a terminator causes the function to read past the slab allocation, triggering a KASAN slab-out-of-bounds read on mount. The sibling function run_unpack() received an analogous bounds-check in commit b62567bca474 ("ntfs3: add buffer boundary checks to run_unpack()"), but run_get_highest_vcn() was missed. Take a run_buf_size parameter and reject any run header whose payload would extend past the buffer end, mirroring the pattern used by run_unpack(). The caller in fslog.c passes the remaining attribute bytes after the mapping-pairs offset. KASAN report (on mainline v7.1 merge window HEAD): BUG: KASAN: slab-out-of-bounds in run_get_highest_vcn+0x3c0/0x410 Read of size 1 at addr ffff88800e2d5400 by task mount/72 Call Trace: run_get_highest_vcn+0x3c0/0x410 do_action.isra.0+0x3ba8/0x7b50 log_replay+0x9ddd/0x10200 ntfs_loadlog_and_replay+0x4ad/0x610 ntfs_fill_super+0x214a/0x4540
How to fix
- Linux Linuxc69b9003332917b652175d5fa9d84158c5ed8617, 8afc24a884aff6a6f08028bd779ee65c40054455, c23083b472a720c3f60b147db05b25b751c7c1bf, a31893206588374d7d16fad387189d8165c7efd3, 41081202eb823f5b27ff164b12010b24428100ad, bb11485a87fbb2254b62cfed630b699d50e57da8, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 5.16, 7.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 425de2aba0d061b3e715d51a3b1992c112ed5b99 ≤ v < c69b9003332917b652175d5fa9d84158c5ed8617, bf7ac4a1d3bfc6e56e54635c3d331a68170d37c9 ≤ v < 8afc24a884aff6a6f08028bd779ee65c40054455, e64f7dfcaff79e7dfff9121a382dd77f9b462f62 ≤ v < c23083b472a720c3f60b147db05b25b751c7c1bf, d3012690a7065d9ca86521a525ad11e8af491d45 ≤ v < a31893206588374d7d16fad387189d8165c7efd3, b62567bca47408e6739dee75f02a2113548af875 ≤ v < 41081202eb823f5b27ff164b12010b24428100ad, b62567bca47408e6739dee75f02a2113548af875 ≤ v < bb11485a87fbb2254b62cfed630b699d50e57da8, bbad75336870b51b81979b97613746237fcb02fe, 41aadf5cb482793a24e05aa136224e179a778586, 6.1.175 ≤ v < 6.1.178, 6.6.140 ≤ v < 6.6.145, 6.12.86 ≤ v < 6.12.97, 6.18.27 ≤ v < 6.18.40, 5.15.209 ≤ v < 5.16, 7.0.4 ≤ v < 7.1, 7.1 | c69b9003332917b652175d5fa9d84158c5ed8617, 8afc24a884aff6a6f08028bd779ee65c40054455, c23083b472a720c3f60b147db05b25b751c7c1bf, a31893206588374d7d16fad387189d8165c7efd3, 41081202eb823f5b27ff164b12010b24428100ad, bb11485a87fbb2254b62cfed630b699d50e57da8, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 5.16, 7.1 |
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