Answer in brief
CVE-2026-90231 records a High severity (CVSS 8.4) vulnerability in apparmor: fix unconfined user namespace restriction forced stack. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc <7d1099b86356df81c379159bfb8a598aaf83ce81 || >=2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc <7da0bdf0610f6d35bbb061536a47fc41646306f0 || >=2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc <08c2f7c8d4b1434cfae006f3daf4d1bce330b57b | 7d1099b86356df81c379159bfb8a598aaf83ce81, 7da0bdf0610f6d35bbb061536a47fc41646306f0, 08c2f7c8d4b1434cfae006f3daf4d1bce330b57b |
| Linux/Linuxgeneric | 6.7 | Not reported |
| Linux/Linuxgeneric | >=2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc <fdd341654471cae4fbd9635d32b848cd0c8bc437 || >=2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc <7d1099b86356df81c379159bfb8a598aaf83ce81 || >=2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc <7da0bdf0610f6d35bbb061536a47fc41646306f0 || >=2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc <08c2f7c8d4b1434cfae006f3daf4d1bce330b57b | fdd341654471cae4fbd9635d32b848cd0c8bc437, 7d1099b86356df81c379159bfb8a598aaf83ce81, 7da0bdf0610f6d35bbb061536a47fc41646306f0, 08c2f7c8d4b1434cfae006f3daf4d1bce330b57b |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 17, 2026
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.
Quoted source text, attributed separately from HOL analysis.