Kernel Hang Prevention in Linux Package: Addressing Link Training Fail Vulnerability
Summary
DEBIAN-CVE-2025-37870: In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: prevent hang on link training fail [Why] When link training fails, the phy clock will be disabled. Affects linux versions < 6.12.25-1. Fixed in 6.12.25-1. How to fix ↓
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Background
The Linux kernel is a core component of the Debian operating system, responsible for managing hardware and system resources. It provides essential services for all other software running on the system, including process management, memory management, and device control. The kernel is crucial for system stability and performance, making any vulnerabilities within it particularly concerning.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the drm/amd/display module, where a failure during link training can lead to a system hang. This occurs because, upon a failed link training, the phy clock is disabled, yet the system assumes success in the enable_streams function. This oversight can result in a hang when a register write is attempted, potentially leading to system instability and requiring a reboot to recover.
How To Fix
Minimum fixed version
6.12.25-1
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 mentioned for this vulnerability. It is recommended to apply the patch as soon as it is available.
Conclusion
The vulnerability in the Linux kernel related to link training failure poses a significant risk of system hangs. Users are urged to update to the patched version 6.12.25-1 to ensure system stability and security. Regular monitoring for vulnerabilities using tools like Vulert can help maintain a secure environment.
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FAQ
The vulnerability involves a potential hang in the Linux kernel when link training fails, which can disrupt system operations.
The vulnerability affects all versions prior to 6.12.25-1 in both Debian 13 and Debian 14.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected by this vulnerability.
While there are no specific workarounds, it is advisable to monitor the situation and apply the patch as soon as possible to mitigate risks.
Detailed information can be found in the Debian CVE database, specifically at https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-37870.json.
References
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