net: Only allow init netns to set default tcp cong to a restricted algo in Kernel
Summary
GSD-2021-1000451: net: Only allow init netns to set default tcp cong to a restricted algo. Affects Kernel versions >= 6670e152447732ba90626f36dfc015a13fbf150e, < 992de06308d9a9584d59b96d294ac676f924e437. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages system resources and facilitates communication between hardware and software. It provides essential functionalities for networking, memory management, process scheduling, and more. The vulnerability in question pertains to the default TCP congestion control algorithm used in the Kernel's networking subsystem. The algorithm determines how network congestion is detected and managed, impacting the performance and stability of network connections.
Vulnerability Detail
The vulnerability allows only the initial network namespace (netns) to set the default TCP congestion control algorithm to a restricted option. This restriction prevents other network namespaces from modifying the default algorithm, ensuring consistent behavior and reducing the risk of potential vulnerabilities or performance issues. The vulnerability was introduced in version v4.15 of the Linux Kernel and was fixed in version v4.19.191. 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 vulnerability in the Kernel's default TCP congestion control algorithm has been addressed in version v4.19.191. It is crucial to update the Linux Kernel to this version or later to ensure the system remains secure. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The default TCP congestion control algorithm determines how network congestion is detected and managed in the Kernel's networking subsystem. It plays a crucial role in maintaining network performance and stability.
Restricting the modification of the default TCP congestion control algorithm to only the initial network namespace ensures consistent behavior across network namespaces and reduces the risk of potential vulnerabilities or performance issues.
You can check the version of the Linux Kernel on your system by running the command 'uname -r' in a terminal.
As of now, there is no known exploit for this vulnerability. However, it is still important to update the Kernel to the fixed version to ensure security.
You can find more information about the fix and the vulnerability in the references provided in the vulnerability details section.
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