CVE-2025-21859 Information

Description

In the Linux kernel the following vulnerability has been resolved:

USB: gadget: f_midi: f_midi_complete to call queue_work

When using USB MIDI a lock is attempted to be acquired twice through a re-entrant call to f_midi_transmit causing a deadlock.

Fix it by using queue_work() to schedule the inner f_midi_transmit() via a high priority work queue from the completion handler.

Reference

https://git.kernel.org/stable/c/24a942610ee9bafb2692a456ae850c5b2e409b05 https://git.kernel.org/stable/c/4ab37fcb42832cdd3e9d5e50653285ca84d6686f https://git.kernel.org/stable/c/8aa6b4be1f4efccbfc533e6ec8841d26e4fa8dba https://git.kernel.org/stable/c/deeee3adb2c01eedab32c3b4519337689ad02e8a https://git.kernel.org/stable/c/e9fec6f42c45db2f62dc373fb1a10d2488c04e79