CVE-2025-71073

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

Input: lkkbd - disable pending work before freeing device

lkkbd_interrupt() schedules lk->tq via schedule_work(), and the work

handler lkkbd_reinit() dereferences the lkkbd structure and its

serio/input_dev fields.

lkkbd_disconnect() and error paths in lkkbd_connect() free the lkkbd

structure without preventing the reinit work from being queued again

until serio_close() returns. This can allow the work handler to run

after the structure has been freed, leading to a potential use-after-free.

Use disable_work_sync() instead of cancel_work_sync() to ensure the

reinit work cannot be re-queued, and call it both in lkkbd_disconnect()

and in lkkbd_connect() error paths after serio_open().