Vulnerability in Kernel: neighbour: allow NUD_NOARP entries to be forced GCed
Summary
GSD-2021-1000824: neighbour: allow NUD_NOARP entries to be forced GCed. Affects Kernel versions >= 58956317c8de52009d1a38a721474c24aef74fe7, < ddf088d7aaaaacfc836104f2e632b29b1d383cfc. No fix is published. How to fix ↓
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Background
The Kernel is a fundamental component of the Linux operating system that acts as a bridge between the hardware and software layers. It provides essential functionalities, such as device drivers, process management, and memory management. The vulnerability in question affects the neighbour subsystem of the Kernel. The neighbour subsystem is responsible for managing the neighbor cache, which stores information about neighboring devices on the network. This vulnerability allows NUD_NOARP entries in the neighbor cache to be forcibly garbage collected (GCed), potentially leading to unexpected behavior and security issues.
Vulnerability Detail
The vulnerability allows NUD_NOARP entries in the neighbor cache to be forcibly GCed. This means that entries representing devices that do not use ARP (Address Resolution Protocol) can be removed from the cache, even if they are still in use. This can result in incorrect network communication, as the Kernel may not have the necessary information to route packets correctly. Furthermore, an attacker could potentially exploit this vulnerability to manipulate the neighbor cache and disrupt network connectivity or launch other attacks. The vulnerability was introduced in version v5.0 of the Linux Kernel and has been fixed in version v5.12.10.
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
In conclusion, the vulnerability in the Kernel's neighbour subsystem allows NUD_NOARP entries to be forcibly GCed, potentially leading to network communication issues and security risks. It is crucial to update the Linux Kernel to version v5.12.10 or later to mitigate this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to incorrect network communication and potential security issues. It may result in disrupted network connectivity and could be exploited by attackers to launch further attacks.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground, and it will analyze the dependencies and alert you if any open-source vulnerabilities, including this one, are found.
Yes, a patch has been released in version v5.12.10 of the Linux Kernel. It is recommended to update to this version or a later one to fix the vulnerability.
The recommended approach is to update the Kernel to the fixed version. However, if updating is not immediately possible, you can consider implementing additional network security measures, such as firewall rules, to mitigate the risk to some extent.
There are no known instances of this vulnerability being actively exploited at the time of this report. However, it is important to apply the fix as soon as possible to prevent any potential security incidents.
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