Bug 2351628 (CVE-2025-21859)

Summary: CVE-2025-21859 kernel: USB: gadget: f_midi: f_midi_complete to call queue_work
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-03-12 12:24:21 UTC 
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.
Comment 1 Mauro Matteo Cascella 2025-03-12 16:43:01 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025031216-CVE-2025-21859-514d@gregkh/T