Segmentation Fault Vulnerability in Linux Kernel Affecting Debian Packages
Summary
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 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is the 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. The kernel is known for its stability and performance but can be vulnerable to various issues, including memory management errors. This specific vulnerability affects the GEM (Graphics Execution Manager) handles used in Direct Rendering Manager (DRM) framebuffers, potentially leading to system crashes.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the DRM subsystem related to GEM handles for framebuffers. 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 during subsequent mode-setting operations. This issue is particularly prevalent in drivers that utilize shadow planes for vmap-ing the dma-buf during page flips, potentially causing system instability and crashes.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, avoid using drivers that rely on shadow planes for vmap-ing the dma-buf during page flips until the kernel is updated. This may help mitigate the risk of encountering segmentation faults while using affected graphics drivers.
Conclusion
The segmentation fault vulnerability in the Linux kernel poses a significant risk to systems running Debian. It is crucial to update the kernel to the latest patched version to mitigate this risk. Users should also consider temporary workarounds while awaiting updates. Utilizing tools like Vulert can help monitor and manage vulnerabilities effectively.
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FAQ
The vulnerability involves improper reference counting of GEM handles in the Linux kernel, leading to potential segmentation faults.
Debian versions 11, 12, and 13 are affected by this vulnerability in the Linux kernel.
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 without requiring any signup.
If an immediate update is not possible, consider using alternative drivers that do not rely on shadow planes for vmap-ing the dma-buf.
Detailed information about this vulnerability can be found in the CVE database and through Debian security advisories.
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