Local Privilege Management Vulnerability in Linux Kernel Affecting AppArmor

CVE-2026-23268

What is CVE-2026-23268?

A vulnerability in the Linux kernel's AppArmor component allows unprivileged local users to manipulate privileged policy management. Through a confused deputy attack, an unprivileged process can leverage file descriptor access to instruct a privileged process to write to sensitive interfaces. This exploitation can lead to significant security risks, including unauthorized removal of confinement, potential denial of service (DoS) attacks on system or application processes, and bypassing user namespace restrictions. The permissions of the policy management interface cannot simply be restricted without impacting necessary access by non-root processes. It is critical for the privileges of tasks writing to these interfaces to reflect a proper subset of those accessing them, to protect against misconfigurations that could lead to privilege escalation.

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