CVE-2026-64432fs/ntfs3: validate Dirty Page Table capacity in log_replay copy_lcns
- 7.8HighCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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").
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.14% · top 97% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 964c3fae1dfc49dde5468eace940f199cda234e9
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 3aa96956ca2200674e2a8f9c23ec6ecd45e5010f
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 946046841013ebac8492ef49651c53638d7a9a6a
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < c6f9e804f73ef809529865fbc7256dd189ff8c33
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < cf28fc1658463d768657cf1c27a83980d4ba7ef2
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < f433acc85b86f327d03ba8b03a33c105c51053de
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 57382ec6ac63b63dce2789e835fded28b698ae79
- affected 5.15
- unaffected < 5.15
- unaffected 5.15.212 – ≤ 5.15.*
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.96 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References7
- https://git.kernel.org/stable/c/964c3fae1dfc49dde5468eace940f199cda234e9 (opens in a new tab)
- https://git.kernel.org/stable/c/3aa96956ca2200674e2a8f9c23ec6ecd45e5010f (opens in a new tab)
- https://git.kernel.org/stable/c/946046841013ebac8492ef49651c53638d7a9a6a (opens in a new tab)
- https://git.kernel.org/stable/c/c6f9e804f73ef809529865fbc7256dd189ff8c33 (opens in a new tab)
- https://git.kernel.org/stable/c/cf28fc1658463d768657cf1c27a83980d4ba7ef2 (opens in a new tab)
- https://git.kernel.org/stable/c/f433acc85b86f327d03ba8b03a33c105c51053de (opens in a new tab)
- https://git.kernel.org/stable/c/57382ec6ac63b63dce2789e835fded28b698ae79 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-48776 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64432)Record last updated .