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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-64432

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

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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").

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • b46acd6a6a627d876898e1c84d3f84902264b445 to < 964c3fae1dfc49dde5468eace940f199cda234e9affected
  • b46acd6a6a627d876898e1c84d3f84902264b445 to < 3aa96956ca2200674e2a8f9c23ec6ecd45e5010faffected
  • b46acd6a6a627d876898e1c84d3f84902264b445 to < 946046841013ebac8492ef49651c53638d7a9a6aaffected
  • b46acd6a6a627d876898e1c84d3f84902264b445 to < c6f9e804f73ef809529865fbc7256dd189ff8c33affected
  • b46acd6a6a627d876898e1c84d3f84902264b445 to < cf28fc1658463d768657cf1c27a83980d4ba7ef2affected
  • b46acd6a6a627d876898e1c84d3f84902264b445 to < f433acc85b86f327d03ba8b03a33c105c51053deaffected
  • b46acd6a6a627d876898e1c84d3f84902264b445 to < 57382ec6ac63b63dce2789e835fded28b698ae79affected

Linux Linux

Default version status: affected

  • 5.15affected
  • 0 to < 5.15unaffected
  • 5.15.212 to ≤ 5.15.*unaffected
  • 6.1.178 to ≤ 6.1.*unaffected
  • 6.6.145 to ≤ 6.6.*unaffected
  • 6.12.96 to ≤ 6.12.*unaffected
  • 6.18.39 to ≤ 6.18.*unaffected
  • 7.1.4 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References