CVE-2026-90231apparmor: fix unconfined user namespace restriction forced stack
- 8.4HighCVSS base score
- 0.16%Exploitation in 30 daysEPSS · top 95% 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: apparmor: fix unconfined user namespace restriction forced stack If a task is already confined by a stack the unprivileged transition restriction on unconfined is not correctly, applied. This results in an escape if two transitions through an unconfined profile can be executed. Fix this by pushing the check into the per profile label build. The check will always be done against unconfined and result in a stack of just the unconfined component when necessary.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 34 days later
· 34 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 | High8.4 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N |
| NVDNVD · Received | 3.1 | High8.4 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.16% · top 95% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.4.
Affected products
- affected 2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc – < fdd341654471cae4fbd9635d32b848cd0c8bc437
- affected 2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc – < 7d1099b86356df81c379159bfb8a598aaf83ce81
- affected 2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc – < 7da0bdf0610f6d35bbb061536a47fc41646306f0
- affected 2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc – < 08c2f7c8d4b1434cfae006f3daf4d1bce330b57b
- affected 6.7
- unaffected < 6.7
- unaffected 6.12.114 – ≤ 6.12.*
- unaffected 6.18.52 – ≤ 6.18.*
- unaffected 7.2.6 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References4
- https://git.kernel.org/stable/c/fdd341654471cae4fbd9635d32b848cd0c8bc437 (opens in a new tab)
- https://git.kernel.org/stable/c/7d1099b86356df81c379159bfb8a598aaf83ce81 (opens in a new tab)
- https://git.kernel.org/stable/c/7da0bdf0610f6d35bbb061536a47fc41646306f0 (opens in a new tab)
- https://git.kernel.org/stable/c/08c2f7c8d4b1434cfae006f3daf4d1bce330b57b (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-2026-81824 (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-2026-90231)Record last updated .