Qualys researchers disclosed a set of privilege escalation vulnerabilities in AppArmor, the Linux mandatory access control module, collectively named CrackArmor. Local unprivileged users can exploit these confused deputy flaws to gain root access on affected Linux systems, bypassing kernel-enforced security controls. Ubuntu systems are affected based on published security advisories. Organizations running Linux workloads should treat this as a high-priority patching item given the direct path to full system compromise.