CVE-2025-71073

Summary

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().

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/3a7cd1397c209076c371d53bf39a55c138f62342 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/3a7cd1397c209076c371d53bf39a55c138f62342Patch
• https://git.kernel.org/stable/c/cffc4e29b1e2d44ab094cf142d7c461ff09b9104Patch
• https://git.kernel.org/stable/c/e58c88f0cb2d8ed89de78f6f17409d29cfab6c5cPatch
• https://git.kernel.org/stable/c/8cf889d45bbc8477206dda78c8f757ea8ff68213
• https://git.kernel.org/stable/c/fb76f871d6155c52ccc0401bbde77dd20b83d0c1