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

🗓️ 16 Jul 2026 00:17:30Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 4 Views

The Linux kernel real time mutex remove_waiter incorrectly uses waiter::task, causing a use-after-free during proxy-lock rollback in futex requeue, enabling local privilege or code execution.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9.6aarch64kernel5.14.0-570.128.1.el9_6kernel-5.14.0-570.128.1.el9_6.aarch64.rpm
Red Hat Enterprise Linux9.6ppc64lekernel5.14.0-570.128.1.el9_6kernel-5.14.0-570.128.1.el9_6.ppc64le.rpm
Red Hat Enterprise Linux9.6s390xkernel5.14.0-570.128.1.el9_6kernel-5.14.0-570.128.1.el9_6.s390x.rpm
Red Hat Enterprise Linux9.6x86_64kernel5.14.0-570.128.1.el9_6kernel-5.14.0-570.128.1.el9_6.x86_64.rpm
Red Hat Enterprise Linux9.6aarch64kernel-64k5.14.0-570.128.1.el9_6kernel-64k-5.14.0-570.128.1.el9_6.aarch64.rpm
Red Hat Enterprise Linux9.6aarch64kernel-64k-core5.14.0-570.128.1.el9_6kernel-64k-core-5.14.0-570.128.1.el9_6.aarch64.rpm
Red Hat Enterprise Linux9.6aarch64kernel-64k-debug5.14.0-570.128.1.el9_6kernel-64k-debug-5.14.0-570.128.1.el9_6.aarch64.rpm
Red Hat Enterprise Linux9.6aarch64kernel-64k-debug-core5.14.0-570.128.1.el9_6kernel-64k-debug-core-5.14.0-570.128.1.el9_6.aarch64.rpm
Red Hat Enterprise Linux9.6aarch64kernel-64k-debug-debuginfo5.14.0-570.128.1.el9_6kernel-64k-debug-debuginfo-5.14.0-570.128.1.el9_6.aarch64.rpm
Red Hat Enterprise Linux9.6aarch64kernel-64k-debug-devel5.14.0-570.128.1.el9_6kernel-64k-debug-devel-5.14.0-570.128.1.el9_6.aarch64.rpm
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16 Jul 2026 08:14Current
6.8Medium risk
Vulners AI Score6.8
CVSS 3.17.8
EPSS0.00125
4