CVE-2026-90231
kernel: apparmor: fix unconfined user namespace restriction forced stack
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 17, 2026
Updated · October 14, 2026
Description
A flaw was found in AppArmor, a Linux kernel security module. This vulnerability allows a local attacker to bypass security confinement. The issue arises from an incorrect application of unprivileged transition restrictions on tasks already confined by a stack, enabling an escape if two transitions through an unconfined profile are executed.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-1220 · Insufficient Granularity of Access Control