ASoC: max9759: fix underflow in speaker_gain_control_put()
Summary
GSD-2022-1000141: ASoC: max9759: fix underflow in speaker_gain_control_put(). Affects Kernel versions >= fa8d915172b8c10ec0734c4021e99e9705023b07, < a0f49d12547d45ea8b0f356a96632dd503941c1e. No fix is published. How to fix ↓
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Background
The ASoC (Audio System on Chip) framework in the Linux Kernel is responsible for managing audio functionality on embedded systems. The max9759 driver is a part of ASoC and provides support for the MAX9759 audio amplifier. The driver allows control over various audio parameters, including speaker gain. However, a vulnerability has been discovered in the speaker_gain_control_put() function of the max9759 driver, which can lead to an underflow condition.
Vulnerability Detail
The vulnerability in the speaker_gain_control_put() function of the max9759 driver can result in an underflow, potentially leading to unexpected behavior or system crashes. An attacker may be able to exploit this vulnerability to gain elevated privileges or disrupt the audio functionality of the system. The vulnerability was introduced in Linux Kernel version v4.17 and has been fixed in version v4.19.228 by commit a0f49d12547d45ea8b0f356a96632dd503941c1e.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If updating the Linux Kernel is not immediately feasible, a temporary workaround can be implemented by disabling the affected driver module. This can be done by blacklisting the 'max9759' module in the system's module configuration file. To do this, add the following line to the file '/etc/modprobe.d/blacklist.conf':
blacklist max9759
Save the file and reboot the system for the changes to take effect.
Conclusion
In conclusion, the ASoC max9759 driver in the Linux Kernel is vulnerable to an underflow condition in the speaker_gain_control_put() function. This vulnerability can potentially be exploited to gain elevated privileges or disrupt audio functionality. It is recommended to update the Linux Kernel to version v4.19.228 or later to fix this vulnerability. If immediate update is not possible, a temporary workaround can be implemented by blacklisting the 'max9759' module. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
ASoC stands for Audio System on Chip. It is a framework in the Linux Kernel that manages audio functionality on embedded systems.
The max9759 driver is a part of ASoC and provides support for the MAX9759 audio amplifier. It allows control over various audio parameters, including speaker gain.
An underflow condition occurs when a value becomes smaller than the minimum representable value for its data type. In the context of this vulnerability, an underflow in the speaker_gain_control_put() function can lead to unexpected behavior or system crashes.
An attacker may be able to exploit this vulnerability to gain elevated privileges or disrupt the audio functionality of the system. However, the exact attack vectors and impact may vary depending on the specific system configuration.
You can use Vulert's playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Vulert uses a manifest file like package-lock.json to monitor and alert in real-time for open-source vulnerabilities in the software.
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