Use After Free Vulnerability in Linux Kernel's XC5000 Tuner Module

CVE-2025-39994

What is CVE-2025-39994?

A vulnerability in the Linux kernel's XC5000 tuner module has been detected, which may lead to use-after-free scenarios. The original implementation in xc5000_release() involved cancel_delayed_work(), which did not ensure that the ongoing delayed work callback—timer_sleep—was fully completed before freeing the associated memory. This oversight could allow the code to attempt dereferencing an invalid memory pointer if the delayed work item executes concurrently. The solution is to replace the call to cancel_delayed_work() with cancel_delayed_work_sync(), ensuring the delayed work is completely canceled prior to deallocating memory, thus preventing any potential race conditions that could arise. Concerns regarding deadlocks have been addressed, confirming that this approach is safe as xc5000_release() operates in a process context without holding locks susceptible to contention with the delayed work.

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