Vulnerability in Kernel: drm/i915 SAGV Block Time
Summary
GSD-2022-1001452: drm/i915: Treat SAGV block time 0 as SAGV disabled. Affects Kernel versions < 1714c5d649ec267b1f98426fe98fa43478b557ff. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionality and acts as an interface between hardware and software. It includes various subsystems, such as the Direct Rendering Manager (DRM), which manages graphics and display-related operations. The i915 driver is responsible for handling Intel integrated graphics. Within the i915 driver, there is a feature called SAGV (Self-Adaptive Graphics Voltage) that dynamically adjusts the voltage supplied to the GPU based on workload. However, a vulnerability exists in the handling of SAGV block time 0, which can lead to unexpected behavior and potential security risks.
Vulnerability Detail
The vulnerability in the drm/i915 driver occurs when a SAGV block time of 0 is treated as SAGV disabled. This means that if the block time is set to 0, the SAGV feature will not function as intended, potentially leading to performance issues or security vulnerabilities. The impact and attack plausibility of this vulnerability have not been proven yet. It is important to note that this vulnerability has been fixed in the Linux Kernel version v5.16.19 by commit 1714c5d649ec267b1f98426fe98fa43478b557ff.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. The recommended approach is to update the Kernel to the fixed version.
Conclusion
The vulnerability in the Kernel's drm/i915 driver related to the handling of SAGV block time 0 can potentially lead to performance issues or security vulnerabilities. It is crucial to update the Linux Kernel to version v5.16.19 or later to fix this vulnerability. For further support on vulnerability remediation, you can reach out to DevNack.com.
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FAQ
The impact of this vulnerability is not yet proven. However, it could potentially lead to performance issues or security vulnerabilities if the SAGV feature is not functioning as intended.
You can check the version of the Linux Kernel installed on your system. If it is older than v5.16.19, your system may be vulnerable. Alternatively, you can use tools like Vulert (https://vulert.com) to scan your system and identify any open-source vulnerabilities.
Yes, a patch has been released in the Linux Kernel version v5.16.19. It is recommended to update to this version or later to fix the vulnerability.
Disabling the SAGV feature manually may help mitigate the vulnerability. However, it is recommended to update to the fixed version of the Kernel as it provides a more comprehensive solution.
You can refer to the vulnerability details in the GSD Database (https://github.com/cloudsecurityalliance/gsd-database) for more information, including the specific commit that fixes the vulnerability.
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