Use-After-Free Vulnerability in Linux Kernel Affecting Mutex Requeue Functionality
CVE-2025-39977

Currently unrated

Key Information:

Vendor: Linux
Status: Linux
Vendor: CVE Published:; 15 October 2025

What is CVE-2025-39977?

A vulnerability within the Linux kernel allows for a potential use-after-free condition during mutex requeue operations. This occurs when a race condition is triggered between two threads, specifically during the execution of the futex_wait_requeue_pi() and futex_requeue() functions. This flaw can lead to synchronization issues, where the state of the futex queue may be inappropriately manipulated. To mitigate this, a specific reading of the task structure is recommended before any state updates are made in the futex queue, ensuring proper synchronization and preventing the use of invalid memory references.

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