CVE-2026-64432

In the Linux kernel, the following vulnerability has been resolved:

fs/ntfs3: validate Dirty Page Table capacity in log_replay copy_lcns

In the analysis pass of $LogFile journal replay, log_replay() copies

LCNs from each action log record into an existing Dirty Page Table

(DPT) entry without bounding the destination index. A crafted NTFS

image with DPT entry lcns_follow=1 and an action log record with

lcns_follow=2 produces a kernel slab out-of-bounds write at mount

time:

BUG: KASAN: slab-out-of-bounds in log_replay+0x654c/0xdb60

Write of size 8 at addr ffff8880095e1040 by task mount

Two attacker-controlled fields can drive j+i past the allocated

page_lcns[] array:

1. dp->lcns_follow (capacity) can be smaller than lrh->lcns_follow.

2. lrh->target_vcn may be smaller than dp->vcn, making the u64

subtraction wrap to a huge size_t.

Validate target VCN delta and per-record LCN count against the

DPT entry capacity, bail via the existing out: cleanup label with

-EINVAL.

This mirrors the bounds-check pattern added in commit b2bc7c44ed17

("fs/ntfs3: Fix slab-out-of-bounds read in DeleteIndexEntryRoot")

and commit 0ca0485e4b2e ("fs/ntfs3: validate rec->used in

journal-replay file record check").