CVE-2022-1048

A use-after-free flaw was found in the Linux kernel’s sound subsystem in the way a user triggers concurrent calls of PCM hw_params. The hw_free ioctls or similar race condition happens inside ALSA PCM for other ioctls. This flaw allows a local user to crash or potentially escalate their privileges on the system.

Keeping the rating as Moderate, because this issue is hard to trigger and requires some permissions for accessing the sound card and only exists if a specific model of the sound card such as Intel 82801 or similar. The known reproducer works only for systems where the /dev/snd/pcmC0D1c device exists.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent the module snd-pcm from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to blacklist a kernel module to prevent it from loading automatically.