CVE-2026-72478

Status: UPDATED  |  Advisory ID: CVE-2026-72478

Key Details

Affected Products, Subsystems & Sectors

What to Know

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 (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References