Vulnerability in Kernel: neighbour: allow NUD_NOARP entries to be forced GCed
Summary
GSD-2021-1000761: neighbour: allow NUD_NOARP entries to be forced GCed. Affects Kernel versions >= 58956317c8de52009d1a38a721474c24aef74fe7, < d99029e6aab62aef0a0251588b2867e77e83b137. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionalities and acts as an interface between hardware and software. It manages system resources, facilitates communication between processes, and ensures the security and stability of the system. 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 (Neighbor Unreachable Detection with No ARP) entries to be forcibly garbage collected, potentially leading to network connectivity issues and security vulnerabilities.
Vulnerability Detail
The vulnerability arises from a flaw in the neighbour subsystem of the Kernel. Specifically, it allows NUD_NOARP entries to be prematurely garbage collected. NUD_NOARP entries are used to indicate that a neighbor is unreachable without using the Address Resolution Protocol (ARP). By forcing the garbage collection of these entries, an attacker could disrupt network connectivity and potentially launch further attacks. The impact and attack plausibility of this vulnerability have not been proven yet, but it is essential to address it to maintain the integrity and security 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. However, applying the recommended fix by updating the Kernel to the patched version is the most effective solution.
Conclusion
The vulnerability in the Kernel's neighbour subsystem, allowing NUD_NOARP entries to be forced garbage collected, poses a risk to network connectivity and system security. It is crucial to update the Kernel to the patched version (v5.4.125 or later) to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The Kernel is a critical component of the Linux operating system that provides core functionalities and acts as an interface between hardware and software.
The neighbour subsystem is responsible for managing the neighbor cache, which stores information about neighboring devices on the network.
NUD_NOARP entries are used to indicate that a neighbor is unreachable without using the Address Resolution Protocol (ARP).
This vulnerability could lead to network connectivity issues and potential security vulnerabilities.
To fix this vulnerability, update the Linux Kernel to version v5.4.125 or later.
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