CVE-2026-64532fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}
- 7.8HighCVSS base score
- 0.13%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: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation} In do_action()'s UpdateRecordDataRoot (fslog.c:3489) and UpdateRecordDataAllocation (fslog.c:3697) cases, the memmove destination is `Add2Ptr(e, le16_to_cpu(e->view.data_off))`, where e->view.data_off comes from an on-disk NTFS_DE inside an INDEX_ROOT or INDEX_BUFFER. Neither case validates view.data_off + dlen against e->size; the existing check_if_index_root / check_if_alloc_index helpers walk the entry chain and validate the entry's offset, but not its internal view fields. The neighbouring read sites (e.g., fs/ntfs3/index.c when iterating view entries) check view.data_off + view.data_size <= e->size. Apply the same bound at the two memmove sites. Reproduced under UML+KASAN on mainline 8d90b09e6741 via pr_warn-only probe instrumentation: with view.data_off forced to 0xFFFC, the memmove writes 32 bytes past the end of the NTFS_DE. This is similar in shape to Pavitra Jha's 2026-05-02 patch "fs/ntfs3: prevent oob in case UpdateRecordDataRoot" (<[email protected]>) which proposes calling ntfs3_bad_de_range(); that helper does not exist in mainline. This patch uses inline checks.
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 · Analyzed | 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)
- 0.13% · top 97% of all CVEs (15 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 – < b20e5a709d8bd190d6e4645606763c7423e694c1
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < d41b382068ca4e64e421f736cdd700095464b6ac
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 429d653ca641d38a78609b8f62e81a0a5c780a2d
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 315d3a9a48b49f889da3d858a9307e677cb9e1bd
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < be306b8d9143a9c076c804a7ca025d69caf9c448
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 36feda687afebae24c472202694448738809c411
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 3e127829e57f5190f612412ece4541cb96d5ec7a
- 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/b20e5a709d8bd190d6e4645606763c7423e694c1 (opens in a new tab)
- https://git.kernel.org/stable/c/d41b382068ca4e64e421f736cdd700095464b6ac (opens in a new tab)
- https://git.kernel.org/stable/c/429d653ca641d38a78609b8f62e81a0a5c780a2d (opens in a new tab)
- https://git.kernel.org/stable/c/315d3a9a48b49f889da3d858a9307e677cb9e1bd (opens in a new tab)
- https://git.kernel.org/stable/c/be306b8d9143a9c076c804a7ca025d69caf9c448 (opens in a new tab)
- https://git.kernel.org/stable/c/36feda687afebae24c472202694448738809c411 (opens in a new tab)
- https://git.kernel.org/stable/c/3e127829e57f5190f612412ece4541cb96d5ec7a (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-2026-49110 (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-2026-64532)Record last updated .