CVE-2026-53166

A flaw was found in the Linux kernel's futex Fast Userspace Mutex requeue mechanism. When a non-top waiter attempts to requeue a Priority Inheritance PI futex it already owns, a NULL pointer dereference can occur. This issue, specifically within the removewaiter function during a self-deadlock...

CVE-2026-53166

Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority...

UBUNTU-CVE-2026-53166

Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority...

CVE-2026-53166

The CVE-2026-53166 issue concerns the Linux kernel futex (Fast Userspace Mutex) requeue path, where a non-top waiter that already owns a PI futex could trigger a NULL pointer dereference in remove_waiter() during self-deadlock, causing a kernel crash/DoS. Public sources describe the vulnerability...

CVE-2026-53166

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CVE-2026-53166 futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock

In the Linux kernel, the following vulnerability has been resolved: futex/requeue: Prevent NULL pointer dereference in removewaiter on self-deadlock When FUTEXCMPREQUEUEPI requeues a non-top waiter that already owns the target PI futex, taskblocksonrtmutex returns -EDEADLK before setting...

EUVD-2026-39257

In the Linux kernel, the following vulnerability has been resolved: futex/requeue: Prevent NULL pointer dereference in removewaiter on self-deadlock When FUTEXCMPREQUEUEPI requeues a non-top waiter that already owns the target PI futex, taskblocksonrtmutex returns -EDEADLK before setting...

EUVD-2026-38845

In the Linux kernel, the following vulnerability has been resolved: futex: Prevent lockup in requeue-PI during signal/ timeout wakeup During wait-requeue-pi task A and requeue-PI task B the following race can happen: Task A Task B futexwaitrequeuepi futexsetuptimer futexdowait futexrequeue CLASSh...

CVE-2026-52977

In the Linux kernel, the following vulnerability has been resolved: futex: Prevent lockup in requeue-PI during signal/ timeout wakeup During wait-requeue-pi task A and requeue-PI task B the following race can happen: Task A Task B futexwaitrequeuepi futexsetuptimer futexdowait futexrequeue CLASSh...

CVE-2026-52977

Concretely, CVE-2026-52977 affects the Linux kernel futex subsystem, specifically a race between wait-requeue-pi and requeue-PI that could cause a live lock on certain scheduling orders (notably UP). The issue arises when top waiters are handled while a signaled/timeout waiter is removing itself ...

CVE-2026-52977 futex: Prevent lockup in requeue-PI during signal/ timeout wakeup

In the Linux kernel, the following vulnerability has been resolved: futex: Prevent lockup in requeue-PI during signal/ timeout wakeup During wait-requeue-pi task A and requeue-PI task B the following race can happen: Task A Task B futexwaitrequeuepi futexsetuptimer futexdowait futexrequeue CLASSh...

PT-2026-51871

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description A race condition exists during signal or timeout wakeup in the futex subsystem. When one task is performing a wait-requeue-pi operation and another is performing a requeue-PI operation, ...