arm64: entry: always set GIC_PRIO_PSR_I_SET during entry in Kernel
Summary
GSD-2021-1000211: arm64: entry: always set GIC_PRIO_PSR_I_SET during entry. Affects Kernel versions >= 23529049c68423820487304f244144e0d576e85a, < d8d52005f57bbb4a4ec02f647e2555d327135c68. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages system resources and provides an interface for applications to interact with the hardware. It is responsible for tasks such as process management, memory management, and device drivers. The arm64 architecture is used in many mobile devices and embedded systems. The GIC_PRIO_PSR_I_SET is a flag in the arm64 architecture's interrupt handling mechanism that controls the handling of interrupts. This vulnerability in the Kernel's arm64 entry code prevents the GIC_PRIO_PSR_I_SET flag from being properly set during interrupt handling, potentially leading to incorrect interrupt handling and system instability.
Vulnerability Detail
The vulnerability arises from a missing setting of the GIC_PRIO_PSR_I_SET flag during interrupt handling in the arm64 entry code of the Kernel. This flag is crucial for proper interrupt handling and ensuring the correct priority of interrupts. Without setting this flag, the system may mishandle interrupts, leading to potential security vulnerabilities and system instability. The impact and attack plausibility of this vulnerability have not been proven yet, but it is essential to address it to maintain the integrity and security of the system.
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
In conclusion, the arm64 entry code in the Kernel has a vulnerability that prevents the proper setting of the GIC_PRIO_PSR_I_SET flag during interrupt handling. This can potentially lead to security vulnerabilities and system instability. It is recommended to update the Kernel to version v5.12.5 or later to fix this vulnerability. For further support on vulnerability remediation, you can contact DevNack.com.
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FAQ
The impact of this vulnerability is not yet proven, but it could potentially lead to security vulnerabilities and system instability due to incorrect interrupt handling.
You can use Vulert's playground at Vulert Scanner to check if your system is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities without requiring access to the code or installation.
Yes, a fix for this vulnerability is available in Linux Kernel version v5.12.5 or later. It is recommended to update the Kernel to the latest version to patch the vulnerability.
There are no known exploits for this vulnerability at the moment. However, it is crucial to address the vulnerability by applying the recommended fix to prevent any potential security risks.
You can find more information about this vulnerability in the Open Source Vulnerability database at https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1000xxx/GSD-2021-1000211.json
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