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CVE-2026-64432

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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").

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in 964c3fae1dfc49dde5468eace940f199cda234e9; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in 3aa96956ca2200674e2a8f9c23ec6ecd45e5010f; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in 946046841013ebac8492ef49651c53638d7a9a6a; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in c6f9e804f73ef809529865fbc7256dd189ff8c33; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in cf28fc1658463d768657cf1c27a83980d4ba7ef2; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in f433acc85b86f327d03ba8b03a33c105c51053de; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in 57382ec6ac63b63dce2789e835fded28b698ae79

  • Linux Linux

    5.15

  • KernelLinux

    From 5.15.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.96; From 6.13.0 · fixed in 6.18.39; From 6.19.0 · fixed in 7.1.4

References 7

git.kernel.org