CVE-2026-80572

Summary

In the Linux kernel, the following vulnerability has been resolved:

Input: byd - synchronize timer deletion before freeing private data

byd_disconnect() uses timer_delete() before freeing the driver's private data. This does not wait for a running byd_clear_touch() callback, which dereferences the private data and its psmouse pointer. A callback racing with disconnect can therefore access the private data after it has been freed. The timer can also still be re-armed by byd_process_byte() while the disconnect is in progress.

Use timer_shutdown_sync() before freeing the private data: it waits for a running callback and turns any later re-arm attempt into a no-op.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/8dbfd8e32a13e116790780ed0be82b5a05eb9916
• https://git.kernel.org/stable/c/2e509ef60ee41a2da0deb062c262bb530143fb37
• https://git.kernel.org/stable/c/c83e79c0842ed29860648bcce5022ef0ba5001c6

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