CVE-2026-93786ksmbd: preserve VFS inherited POSIX ACL mask
- 8.1HighCVSS base score
- 0.34%Exploitation in 30 daysEPSS · top 72% 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: preserve VFS inherited POSIX ACL mask The VFS initializes a child's POSIX ACL from the parent's default ACL and the requested creation mode. Do not mutate the parent ACL or overwrite the child's VFS-computed access and default ACLs afterwards. This preserves restrictive ACL_MASK entries and prevents SMB object creation from widening effective permissions.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 36 days later
· 36 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 | High8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| NVDNVD · Received | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.34% · top 72% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.1.
Affected products
- affected f44158485826c076335d6860d35872271a83791d – < 8493da704275ca5ab67fb88c0ae7b71576e91951
- affected f44158485826c076335d6860d35872271a83791d – < 4a19bb1c45667f5a5f6eff9cf6648e0f692d046f
- affected f44158485826c076335d6860d35872271a83791d – < 591acf171644de590cda245fd8595b473a1beb70
- affected f44158485826c076335d6860d35872271a83791d – < 0093909becbda22b62b39b654dbc607faed59cd0
- affected f44158485826c076335d6860d35872271a83791d – < e148e567a9252643baa125cb65d7ae9c2c6cf68a
- affected 5.15
- unaffected < 5.15
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.111 – ≤ 6.12.*
- unaffected 6.18.53 – ≤ 6.18.*
- unaffected 7.2 – ≤ *
References
References5
- https://git.kernel.org/stable/c/8493da704275ca5ab67fb88c0ae7b71576e91951 (opens in a new tab)
- https://git.kernel.org/stable/c/4a19bb1c45667f5a5f6eff9cf6648e0f692d046f (opens in a new tab)
- https://git.kernel.org/stable/c/591acf171644de590cda245fd8595b473a1beb70 (opens in a new tab)
- https://git.kernel.org/stable/c/0093909becbda22b62b39b654dbc607faed59cd0 (opens in a new tab)
- https://git.kernel.org/stable/c/e148e567a9252643baa125cb65d7ae9c2c6cf68a (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-2026-86173 (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-2026-93786)Record last updated .