ALSA: pcm: Check for null pointer of pointer substream before dereferencing it
Summary
GSD-2022-1002786: ALSA: pcm: Check for null pointer of pointer substream before dereferencing it. Affects Kernel versions >= d4cfb30fce03093ad944e0b44bd8f40bdad5330e, < b41ef7ad9238c22aa2e142f5ce4ce1a1a0d48123. 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 drivers. It allows applications to communicate with sound devices and perform audio-related tasks. The PCM (Pulse Code Modulation) subsystem within ALSA handles digital audio data streams. This vulnerability specifically affects the PCM subsystem.
Vulnerability Detail
The vulnerability in the ALSA PCM subsystem arises from a failure to check for a null pointer of the pointer substream before dereferencing it. This can lead to a null pointer dereference, causing a kernel panic or potentially allowing an attacker to execute arbitrary code with kernel privileges. The vulnerability was introduced in Linux Kernel version v5.6 and is fixed in version v5.18.3 by commit b41ef7ad9238c22aa2e142f5ce4ce1a1a0d48123.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability.
Conclusion
The ALSA PCM subsystem vulnerability, which involves a null pointer dereference, can lead to kernel panics and potential code execution with kernel privileges. It is crucial to update the Linux Kernel to version v5.18.3 or later to mitigate this vulnerability. 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 API for sound card drivers.
The PCM (Pulse Code Modulation) subsystem within ALSA handles digital audio data streams.
A null pointer dereference occurs when a program attempts to access or dereference a memory address that is null (i.e., does not point to a valid memory location). This can lead to crashes or security vulnerabilities.
The potential consequences of this vulnerability include kernel panics, which can cause system crashes, and the possibility of an attacker executing arbitrary code with kernel privileges.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground, and it will analyze and alert you in real-time for any open-source vulnerabilities, including this ALSA vulnerability.
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