CVE-2026-90231apparmor: fix unconfined user namespace restriction forced stack
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.4 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc before 7d1099b86356df81c379159bfb8a598aaf83ce81; from 2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc before 7da0bdf0610f6d35bbb061536a47fc41646306f0; from 2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc before 08c2f7c8d4b1434cfae006f3daf4d1bce330b57b | CNA record |
References
- https://git.kernel.org/stable/c/7d1099b86356df81c379159bfb8a598aaf83ce81
- https://git.kernel.org/stable/c/7da0bdf0610f6d35bbb061536a47fc41646306f0
- https://git.kernel.org/stable/c/08c2f7c8d4b1434cfae006f3daf4d1bce330b57b
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.