CVE-2026-64432fs/ntfs3: validate Dirty Page Table capacity in log_replay copy_lcns
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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").
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from b46acd6a6a627d876898e1c84d3f84902264b445 before 964c3fae1dfc49dde5468eace940f199cda234e9; from b46acd6a6a627d876898e1c84d3f84902264b445 before 3aa96956ca2200674e2a8f9c23ec6ecd45e5010f; from b46acd6a6a627d876898e1c84d3f84902264b445 before 946046841013ebac8492ef49651c53638d7a9a6a; from b46acd6a6a627d876898e1c84d3f84902264b445 before c6f9e804f73ef809529865fbc7256dd189ff8c33; from b46acd6a6a627d876898e1c84d3f84902264b445 before cf28fc1658463d768657cf1c27a83980d4ba7ef2; from b46acd6a6a627d876898e1c84d3f84902264b445 before f433acc85b86f327d03ba8b03a33c105c51053de; from b46acd6a6a627d876898e1c84d3f84902264b445 before 57382ec6ac63b63dce2789e835fded28b698ae79 | CNA record |
linux linux_kernel linux:linux_kernel | from 5.15 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4 | NVD |
References
- https://git.kernel.org/stable/c/964c3fae1dfc49dde5468eace940f199cda234e9patch
- https://git.kernel.org/stable/c/3aa96956ca2200674e2a8f9c23ec6ecd45e5010fpatch
- https://git.kernel.org/stable/c/946046841013ebac8492ef49651c53638d7a9a6apatch
- https://git.kernel.org/stable/c/c6f9e804f73ef809529865fbc7256dd189ff8c33patch
- https://git.kernel.org/stable/c/cf28fc1658463d768657cf1c27a83980d4ba7ef2patch
- https://git.kernel.org/stable/c/f433acc85b86f327d03ba8b03a33c105c51053depatch
- https://git.kernel.org/stable/c/57382ec6ac63b63dce2789e835fded28b698ae79patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.