KVM: arm64: Fix host stage-2 PGD refcount
Summary
GSD-2021-1001894: KVM: arm64: Fix host stage-2 PGD refcount. Affects Kernel versions >= 1025c8c0c6accfcbdc8f52ca1940160f65cd87d6, < b372264c66ef78f2cab44e877fbd765ad6d24c39. No fix is published. How to fix ↓
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Background
The Kernel package is an integral part of the Linux operating system. It provides the core functionality and acts as a bridge between the hardware and software layers. The Kernel package includes various components, such as device drivers, system calls, and process management, that enable the operating system to function properly. In this specific vulnerability, the arm64 subsystem of the Kernel package is affected. The vulnerability relates to an incorrect reference count for the host stage-2 Page Global Directory (PGD) in the Kernel-based Virtual Machine (KVM) module.
Vulnerability Detail
The vulnerability arises from an incorrect reference count for the host stage-2 PGD in the arm64 subsystem of the Kernel package. This issue can potentially be exploited by an attacker to gain unauthorized access or execute arbitrary code on the affected system. The vulnerability was introduced in version v5.13 of the Linux Kernel and was fixed in version v5.14.15. The impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
No specific workaround has been mentioned for this vulnerability.
Conclusion
The KVM: arm64: Fix host stage-2 PGD refcount vulnerability in the Kernel package affects the arm64 subsystem and can potentially allow unauthorized access or arbitrary code execution. It is crucial to update the Linux Kernel to version v5.14.15 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability is not yet proven. However, if successfully exploited, an attacker could gain unauthorized access or execute arbitrary code on the affected system.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and the Vulert Playground will analyze it in real-time.
As of now, there is no known exploit for this vulnerability. However, it is important to apply the fix as soon as possible to mitigate any potential risks.
No specific temporary measures have been mentioned for this vulnerability. It is recommended to update to the fixed version of the Linux Kernel as soon as possible.
You can refer to the vulnerability details in the Open Source Vulnerability format provided by the Cloud Security Alliance's GSD database. The link to the details is available in the 'source' field of the 'database_specific' section of this report.
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