ALSA: usb-audio: Cancel pending work at closing a MIDI substream

Kernel Updated 02 Oct 2025

Summary

28/06/2022

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2022-1003427: ALSA: usb-audio: Cancel pending work at closing a MIDI substream. Affects Kernel versions < 11868ca21585561659c2575b0d6508ef8e9c4291. No fix is published. How to fix ↓

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Background

The ALSA (Advanced Linux Sound Architecture) is a software framework and part of the Linux kernel that provides an API for sound card device drivers. It allows multiple sound sources to be played on a single sound card simultaneously. The usb-audio driver is a part of ALSA that enables USB audio devices to be used with Linux. MIDI (Musical Instrument Digital Interface) is a protocol used for communicating musical information between electronic devices. A substream in the context of usb-audio refers to a specific stream of MIDI data. This vulnerability affects the usb-audio driver in the Linux kernel.

Vulnerability Detail

The vulnerability in the ALSA usb-audio driver allows an attacker to exploit a race condition when closing a MIDI substream. By sending specially crafted MIDI data while a substream is being closed, an attacker can trigger a use-after-free vulnerability, potentially leading to arbitrary code execution or a denial of service. This vulnerability has been fixed in Linux Kernel version v5.15.46 by commit 11868ca21585561659c2575b0d6508ef8e9c4291.

How To Fix

No fixed version is published for this vulnerability.

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Workaround

There is no known workaround for this vulnerability.

Conclusion

The ALSA usb-audio driver in the Linux Kernel is vulnerable to a race condition when closing a MIDI substream. This can be exploited to achieve arbitrary code execution or a denial of service. It is recommended to update the Linux Kernel to version v5.15.46 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

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