Increase wait time for VMbus unload in Linux Kernel
Summary
GSD-2021-1000473: Drivers: hv: vmbus: Increase wait time for VMbus unload. Affects Kernel versions >= f3440c029e471962719de3cbd771933e2165b338, < aac05d8ab50d9f0b18a3f03bb8f88b6c917b6d57. No fix is published. How to fix ↓
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Background
The Linux Kernel is the core component of the Linux operating system. It provides essential services and functions to enable the proper functioning of the system. The HV (Hyper-V) vmbus driver is responsible for communication between the host and virtual machines running on the Hyper-V hypervisor. It allows for efficient data transfer and device enumeration. However, a vulnerability has been discovered in the vmbus driver that could potentially lead to security issues.
Vulnerability Detail
The vulnerability in the HV vmbus driver arises from an insufficient wait time for VMbus unload. When unloading the VMbus, there is a possibility of incomplete cleanup, which can result in resource leaks or use-after-free vulnerabilities. An attacker with local access to a guest VM could potentially exploit this vulnerability to gain elevated privileges or execute arbitrary code on the host system. The impact and attack plausibility of this vulnerability have not been proven, but it is important to address it to ensure the security and stability 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.
Conclusion
The vulnerability in the HV vmbus driver of the Linux Kernel can potentially lead to security issues if not addressed. It is recommended to update the Kernel to version v4.14.233 or later to mitigate the risk of resource leaks or use-after-free vulnerabilities. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability could potentially allow an attacker with local access to a guest VM to gain elevated privileges or execute arbitrary code on the host system.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your manifest file (e.g., package-lock.json) and the Vulert Playground will provide real-time alerts for open-source vulnerabilities.
There is no known exploit for this vulnerability at the moment. However, it is important to apply the recommended fix to mitigate any potential risks.
No, this vulnerability requires local access to a guest VM in order to be exploited.
The fix for this vulnerability requires updating the Linux Kernel to version v4.14.233 or later. Ensure that you follow the official documentation and guidelines provided by the Linux Kernel development team for a successful update.
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