NULL Pointer in flush_workqueue Vulnerability in Kernel
Summary
GSD-2021-1000404: nbd: Fix NULL pointer in flush_workqueue. Affects Kernel versions >= e9e006f5fcf2bab59149cb38a48a4817c1b538b4, < 1c4962df938891af9ab4775f5224ef8601764107. No fix is published. How to fix ↓
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Background
The Kernel is a crucial component of the Linux operating system that manages system resources and facilitates communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The vulnerability in question pertains to the nbd (network block device) module within the Kernel. The nbd module allows remote storage devices to be accessed over a network. However, a flaw in the module's implementation can lead to a NULL pointer dereference in the flush_workqueue function.
Vulnerability Detail
The vulnerability arises due to a NULL pointer dereference in the flush_workqueue function of the nbd module. This can be triggered when attempting to flush a workqueue that has already been destroyed. An attacker could potentially exploit this vulnerability by sending specially crafted requests to a system with the vulnerable Kernel, leading to a system crash or potential privilege escalation. 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
There is no specific workaround mentioned for this vulnerability.
Conclusion
The NULL pointer in flush_workqueue vulnerability in the Kernel's nbd module can potentially lead to system crashes or privilege escalation. It is crucial to update the Kernel to version v5.4.120 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 could range from a system crash to potential privilege escalation.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground and it will alert you in real-time if any open-source vulnerabilities, including this one, are detected.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to apply the necessary updates to mitigate any potential risks.
Yes, this vulnerability can be remotely exploited by sending specially crafted requests to a system with the vulnerable Kernel.
The primary mitigation for this vulnerability is to update the Kernel to version v5.4.120 or later. Regularly updating the Kernel is recommended to ensure the latest security patches are applied.
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