CVE-2026-53296

A flaw was found in the Linux kernel, specifically within the mailbox-test component. This vulnerability occurs when channels are not correctly released during a probe error, leading to a memory leak and a Use-After-Free (UAF) condition. A Use-After-Free (UAF) is a memory corruption vulnerability that allows an attacker to potentially execute arbitrary code or cause a denial of service by manipulating freed memory. This issue could be exploited by a local attacker.

Red Hat has rated this vulnerability as having a Moderate severity because exploitation requires local system access and relies on triggering probe failures in a testing driver, preventing remote exploitation. The mailbox test harness is intended for diagnostic purposes and is not used in standard production deployments, significantly limiting exposure on typical systems. Successful abuse would require specific device initialization error paths to induce kernel memory corruption or system instability.

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.