kernel: rtmutex: Use waiter::task instead of current in remove_waiter()

A flaw was found in the Linux kernel. When the kernel's real-time mutex rtmutex component performs a specific operation called 'proxy-lock rollback' during futex requeue, it incorrectly handles task pointers. This can lead to a 'Use-After-Free' UAF vulnerability, where the system attempts to use...

Important: kernel

Issue Overview: In the Linux kernel, the following vulnerability has been resolved: rtmutex: Use waiter::task instead of current in removewaiter CVE-2026-43499 Affected Packages: kernel Note: This advisory is applicable to Amazon Linux 2 - Kernel-5.15 Extra. Visit this page to learn more about...

Important: kernel

Issue Overview: In the Linux kernel, the following vulnerability has been resolved: rtmutex: Use waiter::task instead of current in removewaiter CVE-2026-43499 Affected Packages: kernel Note: This advisory is applicable to Amazon Linux 2 - Kernel-5.4 Extra. Visit this page to learn more about...

Amazon Linux 2 : kernel, --advisory ALAS2-2026-3801 (ALAS-2026-3801)

The version of kernel installed on the remote host is prior to 4.14.355-284.740. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3801 advisory. In the Linux kernel, the following vulnerability has been resolved: rtmutex: Use waiter::task instead of current in...

Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.4-2026-126 (ALASKERNEL-5.4-2026-126)

The version of kernel installed on the remote host is prior to 5.4.302-226.484. It is, therefore, affected by a vulnerability as referenced in the ALAS2KERNEL-5.4-2026-126 advisory. In the Linux kernel, the following vulnerability has been resolved: rtmutex: Use waiter::task instead of current in...

RHEL 10 : kernel (RHSA-2026:37728)

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:37728 advisory. The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fixes: kernel: rtmutex: Use waiter::task...

Unbreakable Enterprise kernel security update

5.4.17-2136.357.3.2 - locking/rtmutex: Skip removewaiter when waiter is not enqueued Davidlohr Bueso Orabug: 39706958 - rtmutex: Use waiter::task instead of current in removewaiter Keenan Dong Orabug: 39706958 CVE-2026-43499 5.4.17-2136.357.3.1 - KVM: x86: Fix shadow paging use-after-free due to...

Linux Distros Unpatched Vulnerability : CVE-2026-53163

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - locking/rtmutex: Skip removewaiter when waiter is not enqueued syzbot triggered the following splat in removewaiter via FUTEXCMPREQUEUEPI: KASAN: null-ptr-deref...

CVE-2026-53163

A flaw was found in the Linux kernel's rtmutex locking mechanism. A local attacker could trigger a null-pointer dereference by using the FUTEXCMPREQUEUEPI operation. This vulnerability occurs because the removewaiter function is called when the waiter is not properly enqueued, leading to a system...

SUSE CVE-2026-53163

In the Linux kernel, the following vulnerability has been resolved: locking/rtmutex: Skip removewaiter when waiter is not enqueued syzbot triggered the following splat in removewaiter via FUTEXCMPREQUEUEPI: KASAN: null-ptr-deref in range 0x0000000000000a88-0x0000000000000a8f...

CVE-2026-53163

In the Linux kernel, the following vulnerability has been resolved: locking/rtmutex: Skip removewaiter when waiter is not enqueued syzbot triggered the following splat in removewaiter via FUTEXCMPREQUEUEPI: KASAN: null-ptr-deref in range 0x0000000000000a88-0x0000000000000a8f...

EUVD-2026-39254

In the Linux kernel, the following vulnerability has been resolved: locking/rtmutex: Skip removewaiter when waiter is not enqueued syzbot triggered the following splat in removewaiter via FUTEXCMPREQUEUEPI: KASAN: null-ptr-deref in range 0x0000000000000a88-0x0000000000000a8f...

CVE-2026-53163

CVE-2026-53163 affects the Linux kernel rtmutex/futex path. The issue arises when task_blocks_on_rt_mutex() fails to arm the waiter on deadlock detection, leaving waiter->task nil, and the code path can reach remove_waiter() via rt_mutex_start_proxy_lock(). The root cause is tied to how the wa...

CVE-2026-53163 locking/rtmutex: Skip remove_waiter() when waiter is not enqueued

In the Linux kernel, the following vulnerability has been resolved: locking/rtmutex: Skip removewaiter when waiter is not enqueued syzbot triggered the following splat in removewaiter via FUTEXCMPREQUEUEPI: KASAN: null-ptr-deref in range 0x0000000000000a88-0x0000000000000a8f...

CVE-2026-53163

In the Linux kernel, the following vulnerability has been resolved: locking/rtmutex: Skip removewaiter when waiter is not enqueued syzbot triggered the following splat in removewaiter via FUTEXCMPREQUEUEPI: KASAN: null-ptr-deref in range 0x0000000000000a88-0x0000000000000a8f...

PT-2026-52259

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description A null-pointer dereference occurs in the remove waiter function when triggered via FUTEX CMP REQUEUE PI. This happens because task blocks on rt mutex does not arm the waiter during...

SUSE SLES15 Security Update : kernel (SUSE-SU-2026:2421-1)

The remote SUSE Linux SLES15 / SLESSAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:2421-1 advisory. The SUSE Linux Enterprise 15 SP5 kernel was updated to fix various security issues The following security issues were fixed: -...

SUSE-SU-2026:2421-1 Security update for the Linux Kernel

The SUSE Linux Enterprise 15 SP5 kernel was updated to fix various security issues The following security issues were fixed: - CVE-2026-31629: nfc: llcp: add missing return after LLCPCLOSED checks bsc1263790. - CVE-2026-43037: ip6tunnel: clear skb2-cb in ip4ip6err bsc1263995. - CVE-2026-43206:...

Security update for the Linux Kernel

The SUSE Linux Enterprise 15 SP4 kernel was updated to fix various security issues The following security issues were fixed: CVE-2026-31405: media: dvb-net: fix OOB access in ULE extension header tables bsc1261700. CVE-2026-31629: nfc: llcp: add missing return after LLCPCLOSED checks bsc1263790...

Security update for the Linux Kernel

The SUSE Linux Enterprise 11 SP4 kernel was updated to fix various security issues The following security issues were fixed: CVE-2026-23271: perf: Fix perfeventoverflow vs perfremovefromcontext race bsc1260018. CVE-2026-31402: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache bsc1261638...