Riskcovery

CVE-2026-90231

apparmor: fix unconfined user namespace restriction forced stack

State
Published
Severity
8.4 High
Published
Sep 17, 2026
Updated
Oct 21, 2026
Reserved
Sep 11, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.18.4 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:NLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc to before fdd341654471cae4fbd9635d32b848cd0c8bc437Affected
  • 2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc to before 7d1099b86356df81c379159bfb8a598aaf83ce81Affected
  • 2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc to before 7da0bdf0610f6d35bbb061536a47fc41646306f0Affected
  • 2d9da9b188b8cd3b579d7ef5ba5d334be9dd38fc to before 08c2f7c8d4b1434cfae006f3daf4d1bce330b57bAffected
LinuxLinux
  • 6.7Affected
  • before 6.7Not affected
  • 6.12.114 through 6.12.*Not affected
  • 6.18.52 through 6.18.*Not affected
  • 7.2.6 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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