Vulnerability in Kernel: x86/kvm: Disable kvmclock on all CPUs on shutdown
Summary
GSD-2021-1000759: x86/kvm: Disable kvmclock on all CPUs on shutdown. Affects Kernel versions < 9084fe1b3572664ad276f427dce575f580c9799a. 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 functionalities and acts as an interface between hardware and software. It manages system resources, facilitates communication between different software components, and ensures the security and stability of the system. One of the features of the Kernel is the kvmclock, which is used in the Kernel-based Virtual Machine (KVM) to provide a clock source for virtual machines. This vulnerability affects the Kernel's handling of kvmclock on shutdown.
Vulnerability Detail
The vulnerability in the Kernel's x86/kvm module allows an attacker to exploit the kvmclock feature on shutdown. By disabling kvmclock on all CPUs during shutdown, the attacker can potentially disrupt the normal operation of virtual machines running on the system. The impact and attack plausibility of this vulnerability have not been proven yet, but it is important to address it to ensure the security and stability of virtualized environments.
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.
Conclusion
The vulnerability in the Kernel's x86/kvm module, which allows an attacker to exploit the kvmclock feature on shutdown, can potentially disrupt virtual machine operations. It is recommended to update the Linux Kernel to version v5.4.125 or later to fix 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, but it has the potential to disrupt the normal operation of virtual machines running on the system.
You can use Vulert's playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and Vulert will analyze it in real-time.
There is no known exploit for this vulnerability at the moment.
Updating the Kernel to the latest version is the primary recommended security measure to protect against this vulnerability. Additionally, following best practices for system security, such as regular patching and implementing strong access controls, can help mitigate potential risks.
You can find more information about this vulnerability in the GSD-2021-1000759 JSON report available at https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1000xxx/GSD-2021-1000759.json.
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