Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-04-24T00:00:00 kernel: futex: Clear stale exiting pointer in futex_lock_pi() retry path 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CWE-825

A flaw was found in the Linux kernel. A local user could exploit a race condition within the `futex_lock_pi()` retry path. This vulnerability occurs because a stale pointer to an exiting process is not cleared, leading to a kernel warning. Successful exploitation of this flaw could result in a system crash, causing a Denial of Service (DoS).

The futex PI lock retry path could follow a stale `exiting` pointer; upstream clears it before retrying. Red Hat documents this as a local kernel concurrency defect with availability impact. Fixes flow through standard kernel errata. Red Hat Enterprise Linux 10 Fix deferred kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Fix deferred kernel Red Hat Enterprise Linux 7 Fix deferred kernel-rt Red Hat Enterprise Linux 8 Fix deferred kernel Red Hat Enterprise Linux 8 Fix deferred kernel-rt Red Hat Enterprise Linux 9 Fix deferred kernel Red Hat Enterprise Linux 9 Fix deferred kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-31555 https://nvd.nist.gov/vuln/detail/CVE-2026-31555 https://lore.kernel.org/linux-cve-announce/2026042456-CVE-2026-31555-ba94@gregkh/T