CVE-2026-64533fs/ntfs3: validate lcns_follow in log_replay conversion
- 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 lcns_follow in log_replay conversion log_replay() converts DIR_PAGE_ENTRY_32 records into DIR_PAGE_ENTRY records when replaying version 0 restart tables. During this conversion, the memmove() length is derived directly from the on-disk lcns_follow field: memmove(&dp->vcn, &dp0->vcn_low, 2 * sizeof(u64) + le32_to_cpu(dp->lcns_follow) * sizeof(u64)); check_rstbl() validates restart table structure, but does not constrain per-entry lcns_follow values relative to the entry size. A malformed filesystem image can provide an oversized lcns_follow value, causing the conversion memmove() to access memory beyond the bounds of the allocated restart table buffer. The same field is later used to bound iteration over page_lcns[], so validating lcns_follow during conversion also prevents downstream out-of-bounds access from the same malformed metadata. Compute the maximum valid lcns_follow from the already-validated restart table entry size and reject entries that exceed this bound. Reuse the existing t16/t32 scratch variables already declared in log_replay() to avoid introducing new declarations. [[email protected]: fixed the conflicts]
Timeline
ID reserved
By Linux
- 8 days later
· 8 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 · Awaiting Analysis | 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 – < ca343a99806b4fc8e27c48f08be3445c5fcd1445
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < ddfc8683e1a627dbf1b83bacf8961443dd654258
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 57c071e2c4f30b9c6f5aacb6679aab1269fbae99
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 159f694d682e4215b3822ae31ed3a4631628fe55
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 7adb38279812c9c06b0e3fa7382f4d7887f3fa2d
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 32b9f8733feb241627fa5f564b1a99b5cae974c5
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 6a4c53a2e26a865565bd6a460961e8d6fcb32329
- 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 6.12.97 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.5 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References7
- https://git.kernel.org/stable/c/ca343a99806b4fc8e27c48f08be3445c5fcd1445 (opens in a new tab)
- https://git.kernel.org/stable/c/ddfc8683e1a627dbf1b83bacf8961443dd654258 (opens in a new tab)
- https://git.kernel.org/stable/c/57c071e2c4f30b9c6f5aacb6679aab1269fbae99 (opens in a new tab)
- https://git.kernel.org/stable/c/159f694d682e4215b3822ae31ed3a4631628fe55 (opens in a new tab)
- https://git.kernel.org/stable/c/7adb38279812c9c06b0e3fa7382f4d7887f3fa2d (opens in a new tab)
- https://git.kernel.org/stable/c/32b9f8733feb241627fa5f564b1a99b5cae974c5 (opens in a new tab)
- https://git.kernel.org/stable/c/6a4c53a2e26a865565bd6a460961e8d6fcb32329 (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-2026-49111 (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-2026-64533)Record last updated .