CVE-2025-21859

Name of the Vulnerable Software and Affected Versions: Linux kernel (affected versions not specified)

Description: A deadlock issue occurs when using USB MIDI due to a re-entrant call to f midi transmit(), causing an attempt to acquire a lock twice. This issue is resolved by using queue work() to schedule the inner f midi transmit() function via a high priority work queue from the completion handler.

Recommendations: To resolve the issue, use queue work() to schedule the inner f midi transmit() function via a high priority work queue from the completion handler, as implemented in the fix. At the moment, there is no information about a newer version that contains a fix for this vulnerability.