Critical Signal Handling Vulnerability in Linux Kernel: Impacting Debian Packages
Summary
DEBIAN-CVE-2025-38436: In the Linux kernel, the following vulnerability has been resolved: drm/scheduler: signal scheduled fence when kill job When an entity from application B is killed, drm_sched_entity_kill() removes all jobs belonging to t... Affects linux versions < 6.12.37-1. Fixed in 6.12.37-1. How to fix ↓
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Background
The Linux kernel is the core component of the Debian operating system, responsible for managing hardware resources and providing essential services to applications. It supports a wide range of functionalities, including process management, memory management, and device control. This vulnerability affects the Linux kernel versions in Debian 13 and 14, specifically in the drm/scheduler component, which handles job scheduling for graphics processing.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the drm/scheduler component where scheduled fences are not properly signaled when an application entity is killed. This can lead to a situation where dependent applications hang indefinitely, waiting for a dependency that will never be resolved. The issue arises when application B is terminated, and its jobs are removed, but the scheduled fence that application A relies on is not signaled, causing application A to stall.
How To Fix
Minimum fixed version
6.12.37-1
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 to mitigate potential risks.
Conclusion
The identified vulnerability in the Linux kernel's drm/scheduler component poses a significant risk to applications running on Debian systems. It is essential for users to update to the patched version to prevent potential hangs and ensure smooth operation of dependent applications. Regular monitoring using tools like Vulert can help maintain security in open-source software.
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FAQ
The vulnerability involves improper signaling of scheduled fences in the Linux kernel, leading to indefinite hangs in dependent applications.
The vulnerability affects Linux kernel versions in Debian 13 and 14 prior to the fixed version 6.12.37-1.
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.
While there are no specific workarounds, it is crucial to plan for an update as soon as possible to avoid potential application hangs.
While the vulnerability may cause applications to hang, it does not directly lead to data loss. However, it can disrupt workflows and application performance.
References
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