CVE-2026-64556

A flaw was found in the Linux kernel's performance monitoring unit (PMU) subsystem. This vulnerability occurs when a performance event group leader is removed during process execution, but its associated events (siblings) remain active and linked to a stale list. This inconsistent state can lead to a corruption of the PMU context active list, potentially causing system instability or a denial of service. A local attacker could potentially exploit this to disrupt system operations.

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 for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.