Segmentation Fault Vulnerability in Linux Kernel: drm/gem Framebuffer Reference Handling
Summary
DEBIAN-CVE-2025-38449: In the Linux kernel, the following vulnerability has been resolved: drm/gem: Acquire references on GEM handles for framebuffers A GEM handle can be released while the GEM buffer object is attached to a DRM framebuffer. Affects linux versions < 6.12.41-1. Fixed in 6.12.41-1. How to fix ↓
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Background
The Linux kernel is a core component of the operating system that manages hardware and system resources. It provides essential functionalities such as process management, memory management, and device control. The kernel's graphics subsystem, particularly the Direct Rendering Manager (DRM), facilitates rendering graphics in a secure and efficient manner. This vulnerability affects the DRM's handling of Graphics Execution Manager (GEM) handles, which are crucial for managing graphics memory and framebuffers.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the DRM subsystem related to the handling of GEM handles for framebuffers. Specifically, a GEM handle can be released while the associated GEM buffer object is still attached to a DRM framebuffer. This improper reference counting can lead to the release of the dma-buf backing the buffer object, resulting in a segmentation fault when attempting to use the framebuffer in subsequent mode-setting operations. This issue is exacerbated in drivers that utilize shadow planes for virtual mapping during page flips, potentially causing system instability and crashes.
How To Fix
Minimum fixed version
6.12.41-1
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 advisable to apply the patch as soon as it is available to mitigate any potential risks.
Conclusion
The vulnerability in the Linux kernel's DRM subsystem poses a significant risk due to improper handling of GEM handles, leading to potential segmentation faults. Users are strongly advised to update to the patched versions of the Linux package to ensure system stability and security.
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FAQ
The vulnerability involves improper reference counting of GEM handles in the DRM subsystem, leading to potential segmentation faults.
The vulnerability affects the Linux kernel versions prior to 6.12.41-1 for Debian 13 and prior to 6.16.3-1 for Debian 14.
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Failure to address this vulnerability may lead to system crashes and instability, particularly when using graphics-intensive applications.
Currently, there are no specific workarounds available. It is crucial to apply the patch as soon as it is released.
References
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