CVE-2026-68097ksmbd: validate ACE size against SID sub-authorities
- 8.8HighCVSS base score
- 0.45%Exploitation in 30 daysEPSS · top 61% 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: ksmbd: validate ACE size against SID sub-authorities set_ntacl_dacl() validates sid.num_subauth before copying an ACE, but does not verify that the declared ACE size contains all sub-authorities described by that field. An undersized ACE can therefore be copied and later make the POSIX ACL deduplication walk inspect data beyond the copied ACE boundary. The existing initial bound check is also too small. It only ensures that the ACE size field is accessible before set_ntacl_dacl() reads sid.num_subauth farther into the input buffer. Require enough input for the fixed SID header before accessing num_subauth, reject ACEs smaller than that header, and skip ACEs whose declared size cannot contain the complete SID. This makes the validation consistent with the other ACE walk paths.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 54 days later
· 54 days 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 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.45% · top 61% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Affected products
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 5a2d9fe0e87c71baa0aaa1cfc1361892fcd1ece0
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < b7cb5bf0855470799f12da825de91e48951b3876
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 62d80d7c2d9428085e7458ad4c06ca8c0984039b
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 337022d9dfac441c3b35e4455a51aa981996e02e
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 61fd3559199f7fa693dcbff35e59477e24af041a
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 5152c6d49e3fd4e9f2e857c57527aead752f1f87
- affected 5.15
- unaffected < 5.15
- unaffected 6.1.189 – ≤ 6.1.*
- unaffected 6.6.148 – ≤ 6.6.*
- unaffected 6.12.101 – ≤ 6.12.*
- unaffected 6.18.42 – ≤ 6.18.*
- unaffected 7.1.6 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References6
- https://git.kernel.org/stable/c/5a2d9fe0e87c71baa0aaa1cfc1361892fcd1ece0 (opens in a new tab)
- https://git.kernel.org/stable/c/b7cb5bf0855470799f12da825de91e48951b3876 (opens in a new tab)
- https://git.kernel.org/stable/c/62d80d7c2d9428085e7458ad4c06ca8c0984039b (opens in a new tab)
- https://git.kernel.org/stable/c/337022d9dfac441c3b35e4455a51aa981996e02e (opens in a new tab)
- https://git.kernel.org/stable/c/61fd3559199f7fa693dcbff35e59477e24af041a (opens in a new tab)
- https://git.kernel.org/stable/c/5152c6d49e3fd4e9f2e857c57527aead752f1f87 (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-2026-55478 (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-2026-68097)Record last updated .