Increase wait time for VMbus unload in Linux Kernel
Summary
GSD-2021-1000483: Drivers: hv: vmbus: Increase wait time for VMbus unload. Affects Kernel versions >= 2b557a0612ae0aec89c6649c19467830f6965e76, < 9e5f64bb615b435a9af501dc4167258acc1ba44e. 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 facilitates the exchange of messages and data between the host and guest operating systems. However, a vulnerability has been discovered in the vmbus driver that could potentially lead to security issues.
Vulnerability Detail
The vulnerability in the vmbus driver arises from a wait time limitation during the unloading of the VMbus. The wait time is insufficient, which can result in incomplete unloading of the VMbus. This incomplete unloading can lead to resource leaks and potential security vulnerabilities. Attackers may exploit these vulnerabilities to gain unauthorized access or perform other malicious activities on the affected system. The vulnerability was introduced in Linux Kernel version v4.9.237 and has been fixed in version v4.9.269.
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 solution is to update the Linux Kernel to the fixed version.
Conclusion
The vulnerability in the vmbus driver of the Linux Kernel can lead to incomplete unloading of the VMbus, resulting in resource leaks and potential security risks. It is crucial to update the Linux Kernel to version v4.9.269 or later to mitigate these risks. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can result in incomplete unloading of the VMbus, leading to resource leaks and potential security risks. Attackers may exploit these vulnerabilities for unauthorized access or other malicious activities.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. It requires no signup and uses a manifest file like package-lock.json to monitor and alert in real-time for open-source vulnerabilities.
No specific workaround is mentioned for this vulnerability. It is recommended to update the Linux Kernel to the fixed version.
The vulnerability was introduced in Linux Kernel version v4.9.237 and has been fixed in version v4.9.269.
You can find more information about this vulnerability in the GSD database entry: https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1000xxx/GSD-2021-1000483.json
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