Critical EFAULT Handling Vulnerability in Linux Kernel Package
Summary
DEBIAN-CVE-2025-21880: In the Linux kernel, the following vulnerability has been resolved: drm/xe/userptr: fix EFAULT handling Currently we treat EFAULT from hmm_range_fault() as a non-fatal error when called from xe_vm_userptr_pin() with the... Affects linux versions < 6.12.19-1. Fixed in 6.12.19-1. How to fix ↓
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Background
The Linux kernel is a core component of the Debian operating system, responsible for managing hardware resources and providing essential services to software applications. It is known for its stability, performance, and extensive support for various hardware architectures. However, vulnerabilities can arise due to complex interactions within the kernel, potentially leading to system instability or security breaches.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the drm/xe/userptr component, specifically related to the handling of EFAULT errors during the user pointer pinning process. This issue arises when the system incorrectly treats EFAULT as a non-fatal error, which can lead to undefined behavior, including potential crashes or data corruption. The vulnerability was reported after users experienced warnings and subsequent system failures when running specific workloads, indicating that the user pointer virtual memory area (vma) could still be on the rebind list despite the error, leading to further complications.
How To Fix
Minimum fixed version
6.12.19-1
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 any risks associated with this issue.
Conclusion
The EFAULT handling vulnerability in the Linux kernel poses significant risks to system stability and security. Users are strongly advised to update to the patched version to mitigate these risks. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities in open-source software effectively.
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FAQ
The vulnerability involves improper handling of EFAULT errors in the Linux kernel, which can lead to system instability and crashes.
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.
If exploited, this vulnerability could lead to system crashes, data corruption, or other undefined behaviors, impacting the stability of applications relying on the Linux kernel.
Yes, the vulnerability affects versions prior to 6.12.19-1 of the Linux kernel in Debian 13 and 14.
While there are no specific workarounds, it is crucial to monitor your system for unusual behavior and apply the patch as soon as possible.
References
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