Bug 2376086 (CVE-2025-38105)

Summary: CVE-2025-38105 kernel: ALSA: usb-audio: Kill timer properly at removal
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-07-03 09:04:19 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ALSA: usb-audio: Kill timer properly at removal

The USB-audio MIDI code initializes the timer, but in a rare case, the
driver might be freed without the disconnect call.  This leaves the
timer in an active state while the assigned object is released via
snd_usbmidi_free(), which ends up with a kernel warning when the debug
configuration is enabled, as spotted by fuzzer.

For avoiding the problem, put timer_shutdown_sync() at
snd_usbmidi_free(), so that the timer can be killed properly.
While we're at it, replace the existing timer_delete_sync() at the
disconnect callback with timer_shutdown_sync(), too.
Comment 1 Avinash Hanwate 2025-07-03 15:24:04 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025070322-CVE-2025-38105-dfcf@gregkh/T