ALSA: pcm: Fix races among concurrent hw_params and hw_free calls
Summary
GSD-2022-1001331: ALSA: pcm: Fix races among concurrent hw_params and hw_free calls. Affects Kernel versions < 1bbf82d9f961414d6c76a08f7f843ea068e0ab7b. No fix is published. How to fix ↓
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Background
The ALSA (Advanced Linux Sound Architecture) package is responsible for providing audio and MIDI functionality to Linux-based systems. It includes drivers, libraries, and utilities for audio devices. The pcm component of ALSA is responsible for managing the PCM (Pulse Code Modulation) audio streams. PCM is a method used to digitally represent analog audio signals. The pcm component handles operations such as opening and closing audio devices, configuring hardware parameters, and freeing resources. However, there is a vulnerability in the pcm component that allows for races among concurrent hw_params and hw_free calls.
Vulnerability Detail
The vulnerability in the pcm component of ALSA allows for races among concurrent hw_params and hw_free calls. This means that when multiple processes or threads attempt to configure hardware parameters (hw_params) and free resources (hw_free) at the same time, there is a possibility of race conditions. Race conditions can lead to inconsistent or unexpected behavior, including crashes, data corruption, or privilege escalation. The vulnerability has been fixed in Linux Kernel version v5.17.1 by commit 1bbf82d9f961414d6c76a08f7f843ea068e0ab7b.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is recommended to apply the fix as soon as possible.
Conclusion
The vulnerability in the pcm component of ALSA can lead to race conditions among concurrent hw_params and hw_free calls. It is recommended to update the Linux Kernel to version v5.17.1 or later to fix this vulnerability. There is no known workaround, so applying the fix is crucial to ensure the security and stability of the system. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
ALSA (Advanced Linux Sound Architecture) is a software framework and part of the Linux kernel that provides an interface for audio and MIDI functionality on Linux-based systems.
The pcm component of ALSA is responsible for managing PCM (Pulse Code Modulation) audio streams. It handles operations such as opening and closing audio devices, configuring hardware parameters, and freeing resources.
A race condition is a situation in which the behavior of a program or system depends on the relative timing of events, such as concurrent execution of multiple processes or threads. In the case of this vulnerability, race conditions can occur when multiple processes or threads attempt to configure hardware parameters and free resources at the same time.
The possible consequences of this vulnerability include crashes, data corruption, or privilege escalation. Race conditions can lead to inconsistent or unexpected behavior, which can be exploited by attackers to gain unauthorized access or disrupt the system.
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