CVE-2026-31551

A flaw was found in the mac80211 Wi-Fi subsystem of the Linux kernel. A local user could exploit a race condition in the aql_enable_write() function, which does not properly handle concurrent write operations to the debug file system. This could lead to a static_branch_dec() underflow, resulting in a kernel warning and potentially a system soft lockup, causing a Denial of Service (DoS).

This Moderate flaw in the Linux kernel's mac80211 Wi-Fi subsystem allows a local attacker to trigger a denial of service. By exploiting a race condition in the aql_enable_write() function through concurrent write operations to the debug file system, a kernel warning and system soft lockup can occur. This issue requires local access to the system.

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.