Critical Vulnerability in Linux Package: HDMI Mode Switching Issue
Summary
DEBIAN-CVE-2023-52634: In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix disable_otg_wa logic [Why] When switching to another HDMI mode, we are unnecesarilly disabling/enabling FIFO causing both HPO and D... Affects linux versions < 6.7.7-1. Fixed in 6.7.7-1. How to fix ↓
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Background
The Linux package is a core component of many operating systems, providing essential functionalities for hardware interaction and system management. It is widely used across various distributions, including Debian. This package is responsible for managing system resources, device drivers, and kernel operations. The vulnerability in question affects the display subsystem, specifically the HDMI mode switching logic, which can lead to system instability.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the drm/amd/display subsystem. The issue arises from improper handling of FIFO during HDMI mode switching, where both HPO and DIG registers can be activated simultaneously. This can result in a system hang when changing refresh rates, as the FIFO may remain enabled when it should not be. The vulnerability is rooted in the logic that unnecessarily disables and enables FIFO, leading to potential system crashes.
How To Fix
Minimum fixed version
6.7.7-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds provided for this vulnerability. It is recommended to apply the patch as soon as it is available to mitigate the risk.
Conclusion
The identified vulnerability in the Linux package poses a significant risk of system instability due to improper HDMI mode switching logic. Users are strongly advised to update to the patched version 6.7.7-1 to mitigate this risk. Regular monitoring and timely updates are essential for maintaining system security.
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FAQ
The vulnerability involves improper handling of FIFO during HDMI mode switching, which can lead to system hangs.
The vulnerability affects all versions prior to 6.7.7-1 in both Debian 13 and Debian 14.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without needing to sign up.
While there are no specific workarounds, it is crucial to plan for an update as soon as possible to avoid potential system instability.
Detailed information can be found in the Debian CVE database at https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-52634.json.
References
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