Bug 2334498 (CVE-2024-56533)

Summary: CVE-2024-56533 kernel: ALSA: usx2y: Use snd_card_free_when_closed() at disconnection
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2024-12-27 15:05:57 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ALSA: usx2y: Use snd_card_free_when_closed() at disconnection

The USB disconnect callback is supposed to be short and not too-long
waiting.  OTOH, the current code uses snd_card_free() at
disconnection, but this waits for the close of all used fds, hence it
can take long.  It eventually blocks the upper layer USB ioctls, which
may trigger a soft lockup.

An easy workaround is to replace snd_card_free() with
snd_card_free_when_closed().  This variant returns immediately while
the release of resources is done asynchronously by the card device
release at the last close.
Comment 1 Avinash Hanwate 2024-12-28 05:21:12 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024122724-CVE-2024-56533-5de6@gregkh/T