CVE-2024-56532: ALSA: us122l: Use snd_card_free_when_closed() at disconnection
In the Linux kernel, the following vulnerability has been resolved:
ALSA: us122l: Use sndcardfreewhenclosed() at disconnection
The USB disconnect callback is supposed to be short and not too-long waiting. OTOH, the current code uses sndcardfree() 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 sndcardfree() with sndcardfreewhenclosed(). This variant returns immediately while the release of resources is done asynchronously by the card device release at the last close.
The loop of us122l->mmapcount check is dropped as well. The check is useless for the asynchronous operation with whenclosed().
Other sources
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— Launchpad
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2024-56532?
CVE-2024-56532 has a medium severity level due to its potential impact on system stability during USB disconnection.
How do I fix CVE-2024-56532?
To fix CVE-2024-56532, upgrade to a Linux kernel version of 6.1.123-1, 6.1.128-1, 6.12.12-1, or 6.12.15-1.
Which versions of the Linux kernel are affected by CVE-2024-56532?
CVE-2024-56532 affects Linux kernel versions up to and including 5.10.226-1.
What component is impacted by CVE-2024-56532?
CVE-2024-56532 impacts the ALSA USB driver related to the US122L audio interface.
Is CVE-2024-56532 present in Debian packages?
Yes, CVE-2024-56532 is present in Debian packages of the Linux kernel prior to version 5.10.227-1.