Hash Collision Vulnerability in Linux Kernel IPv6 Connections

CVE-2023-1206

What is CVE-2023-1206?

CVE-2023-1206 is a significant vulnerability found within the Linux kernel's IPv6 functionality, specifically in the IPv6 connection lookup table. This flaw presents a hash collision issue that can be exploited during SYN flood attacks. When an attacker, either situated on the local network or possessing a high bandwidth connection, targets a server that accepts IPv6 connections, they can cause a substantial increase in CPU usage—up to 95%. This excessive resource consumption can lead to performance degradation, service interruptions, and potentially make the system unresponsive, effectively disrupting any operations dependent on the affected Linux server.

Potential impact of CVE-2023-1206

1. Denial of Service (DoS): The primary impact of CVE-2023-1206 is the risk of a denial of service. By utilizing this vulnerability, attackers can overwhelm the server, leading to significant slowdowns or complete unavailability of services that rely on IPv6 connections.

2. Resource Exhaustion: The flaw can cause critical resource exhaustion on the server's CPU. As CPU usage spikes to excessive levels (up to 95%), other legitimate processes may be starved of necessary resources, affecting overall system stability and potentially crashing essential applications.

3. Increased Attack Surface: With the potential for successful exploitation, organizations running vulnerable systems may face heightened risk. Attackers could leverage this vulnerability as a stepping stone to conduct further attacks, such as gaining access to sensitive data or executing additional malicious operations within the network.

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