Kernel Panic Vulnerability in Linux Package: DRM VBlank Check Issue
Summary
CVE-2025-38467: In the Linux kernel, the following vulnerability has been resolved: drm/exynos: exynos7_drm_decon: add vblank check in IRQ handling If there's support for another console device (such as a TTY serial), the kernel occasio... 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 a core component of the Debian operating system, responsible for managing hardware resources and providing essential services for applications. It supports various functionalities, including process management, memory management, and device control. The kernel's stability and reliability are critical for system performance, and vulnerabilities can lead to severe consequences, including system crashes and data loss.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the DRM (Direct Rendering Manager) subsystem related to the Exynos7 platform. This issue arises during IRQ (interrupt request) handling, where the kernel can panic if another console device, such as a TTY serial, is supported. The panic occurs due to a NULL pointer dereference, indicating a race condition when handling vertical blanking (vblank) signals. The call trace reveals that the panic is triggered in the drm_crtc_handle_vblank function, leading to potential system instability during boot.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can disable support for additional console devices that may trigger the kernel panic during boot. This can be done by modifying the boot parameters or configuration files to prevent the loading of unnecessary console drivers.
Conclusion
The CVE-2025-38467 vulnerability in the Linux kernel poses a significant risk of kernel panics during boot, particularly for systems with additional console device support. Users are advised to update their Linux packages to the latest patched versions to ensure system stability and security. Temporary workarounds are available, but applying the patch is the recommended solution.
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FAQ
CVE-2025-38467 is a vulnerability in the Linux kernel related to the DRM subsystem, which can cause kernel panics during boot under certain conditions.
If your system supports additional console devices, it may experience kernel panics, leading to instability and potential data loss during boot.
Yes, a patch has been released for the Linux package in Debian 11, 12, and 13. Users should update their systems to the latest version to mitigate the risk.
As a temporary measure, consider disabling support for additional console devices to avoid triggering the kernel panic until you can apply the patch.
You can use Vulert, which monitors and alerts in real-time for open-source vulnerabilities by analyzing your manifest file like package-lock.json. You can check for vulnerabilities without signing up using the Vulert playground.
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