Out-of-Bound Writes in drm/amdgpu Package
Summary
GSD-2021-1002128: drm/amdgpu: Fix even more out of bound writes from debugfs. Affects Kernel versions >= 918698d5c2b50433714d2042f55b55b090faa167, < 9eb4bdd554fc31a5ef6bf645a20ff21618ce45a9. No fix is published. How to fix ↓
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Background
The drm/amdgpu package is a component of the Linux Kernel that provides support for AMD GPUs. It enables graphics rendering and display functionality for AMD graphics cards. The package interacts with the hardware through the debugfs interface, which allows users to access and modify internal GPU parameters for debugging purposes.
Vulnerability Detail
The vulnerability in the drm/amdgpu package involves out-of-bound writes from the debugfs interface. This can occur when certain parameters passed through debugfs are not properly validated, leading to memory corruption and potential privilege escalation attacks. An attacker with local access to the system could exploit this vulnerability to gain elevated privileges or crash the system. The vulnerability was introduced in Linux Kernel version v5.10 and has been fixed in version v5.14.16.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can disable the debugfs interface by removing the debugfs mount point or restricting access to it. This can be done by modifying the system's fstab file or using the mount command with appropriate options. However, disabling debugfs may impact the ability to debug and monitor GPU performance.
Conclusion
The vulnerability in the drm/amdgpu package can lead to out-of-bound writes and potential privilege escalation attacks. It is crucial to update the Linux Kernel to version v5.14.16 or later to fix this vulnerability. Alternatively, users can disable the debugfs interface as a temporary workaround. For further assistance and support in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can potentially allow an attacker to gain elevated privileges or crash the system by exploiting out-of-bound writes in the drm/amdgpu package.
Any system running Linux Kernel version v5.10 to v5.14.15 with the drm/amdgpu package is affected by this vulnerability.
At the time of this report, there are no known public exploits targeting this vulnerability. However, it is advisable to apply the recommended fixes as soon as possible to mitigate any potential risks.
No, this vulnerability requires local access to the system to exploit it.
Updating the kernel is the recommended solution to fix this vulnerability. However, as a temporary workaround, users can disable the debugfs interface to mitigate the risk.
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