CVE-2026-90231 — apparmor: fix unconfined user namespace restriction forced stack
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 t…
Published: 2026-09-17 · CVSS: 8.4 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7