A vulnerability in the Linux kernel AppArmor module allows for the bypass of CPU resource limits, potentially leading to unauthorized resource consumption.

The AppArmor security module incorrectly enforces rlimit for POSIX CPU timers. This failure allows a local, authenticated user to bypass intended CPU time restrictions, leading to excessive resource consumption.

With a CVSS score of 7.3, this flaw poses a notable risk to multi-tenant environments and shared hosting platforms. An attacker can circumvent security policies to consume disproportionate CPU resources, negatively impacting the performance of other services or applications running on the same host.

Immediate Action: Monitor vendor security bulletins and apply the kernel patches as soon as they become available for your specific distribution.

Proactive Monitoring: Monitor system logs and resource usage for unusual CPU activity or processes exceeding expected operational boundaries.

Compensating Controls: Use alternative cgroup-based resource constraints or hardware-level partitioning to enforce resource limits until the kernel patch can be applied.

Public Exploit Available: false

While this is a local privilege/resource bypass, it remains a serious concern for security-sensitive environments. Administrators should track the availability of the upstream kernel fix and schedule deployment across all affected Linux systems to restore proper resource enforcement.