CVE-2026-53109

A flaw was found in the Linux kernel's powerpc page table fragment handling. During process exit, a race condition can occur where a page table fragment's active flag is not properly cleared. This can lead to a "bad page state" error, potentially causing system instability or a Denial of Service (DoS) for a local user.

This vulnerability is rated as having a Moderate impact because it is restricted to PowerPC architectures and requires local user execution to trigger. On supported PowerPC enterprise systems, an unprivileged local account could cause kernel page table accounting inconsistencies during process termination, resulting in a denial of service through a system crash. Other hardware architectures commonly deployed, including x86_64 and aarch64, do not use this fragment tracking mechanism and remain unaffected.

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 don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.