Use After Free Vulnerability in Linux Kernel: Impacting Debian Packages
Summary
DEBIAN-CVE-2025-37763: In the Linux kernel, the following vulnerability has been resolved: drm/imagination: take paired job reference For paired jobs, have the fragment job take a reference on the geometry job, so that the geometry job cannot... 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 the core component of the Debian operating system, responsible for managing system resources and facilitating communication between hardware and software. It is a critical piece of software that supports various functionalities, including process management, memory management, and device control. The vulnerability identified as DEBIAN-CVE-2025-37763 affects the Linux kernel in Debian versions 13 and 14, specifically related to the handling of paired jobs in the GPU scheduler.
Vulnerability Detail
In the Linux kernel, a use after free vulnerability has been discovered in the handling of paired jobs, particularly in the drm/imagination component. This issue arises when the fragment job does not properly manage the reference to the geometry job, allowing the geometry job structure to be freed while still in use. This can lead to potential crashes or arbitrary code execution, as the fragment job may attempt to access freed memory. The vulnerability was detected by KASAN, which reported a slab-use-after-free error during job preparation, indicating a critical flaw in memory management.
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
As a temporary workaround, users can avoid using the affected GPU features until the kernel is updated. This may involve disabling specific graphics drivers or features that rely on the drm/imagination component.
Conclusion
The vulnerability DEBIAN-CVE-2025-37763 poses a significant risk to users of the Linux kernel in Debian 13 and 14. It is crucial for users to update their systems to the patched version to ensure security and stability. Utilizing tools like Vulert can help monitor and manage vulnerabilities effectively.
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FAQ
A use after free vulnerability occurs when a program continues to use a memory location after it has been freed, potentially leading to crashes or security breaches.
You can use Vulert, which monitors open-source vulnerabilities in your software. By uploading your manifest file, such as package-lock.json, you can check for vulnerabilities without installation.
The risks include system crashes, data corruption, and potential unauthorized access to system resources, which could lead to further exploitation.
Yes, temporarily disabling the affected GPU features can mitigate the risk until the patch is applied.
Detailed information can be found in the Debian security advisories and the official Linux kernel documentation.
References
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