CVE-2022-4128 : Security Advisory and Response

A NULL pointer dereference issue was discovered in the Linux kernel in the MPTCP protocol when traversing the subflow list at disconnect time. This could allow a local user to potentially crash the system, resulting in a denial of service.

Understanding CVE-2022-4128

This section will provide insight into the impact and technical details of the CVE-2022-4128.

What is CVE-2022-4128?

CVE-2022-4128 involves a NULL pointer dereference vulnerability in the Linux kernel's MPTCP protocol, specifically during the traversal of the subflow list when disconnecting. This flaw enables a local user to exploit the vulnerability and potentially crash the system, leading to a denial of service.

The Impact of CVE-2022-4128

The impact of CVE-2022-4128 is significant as it allows an attacker with local access to exploit the vulnerability and disrupt the system's functionality. By causing a system crash, a denial of service condition can be triggered, impacting the availability of services.

Technical Details of CVE-2022-4128

In this section, we will delve into the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The CVE-2022-4128 vulnerability stems from a NULL pointer dereference issue in the MPTCP protocol within the Linux kernel. It arises during the traversal of the subflow list at disconnect time, posing a risk of system crash and denial of service.

Affected Systems and Versions

The Linux kernel, particularly the MPTCP protocol, is susceptible to CVE-2022-4128. Systems running versions prior to 5.19 are affected by this vulnerability.

Exploitation Mechanism

Local users can exploit the vulnerability by manipulating the subflow list within the MPTCP protocol during disconnect operations, leading to a NULL pointer dereference and potential system crash.

Mitigation and Prevention

This section outlines the steps to mitigate the impact of CVE-2022-4128 and prevent potential exploitation.

Immediate Steps to Take

To mitigate the risk posed by CVE-2022-4128, users are advised to apply relevant security patches promptly. Additionally, limiting access privileges for local users can help reduce the likelihood of exploitation.

Long-Term Security Practices

Implementing robust security measures, such as regular security updates, security training for users, and monitoring system logs for suspicious activities, can enhance long-term security posture.

Patching and Updates

Ensuring the timely installation of patches released by Linux kernel maintainers is crucial to addressing CVE-2022-4128. Regularly updating the system to the fixed version (5.19 and above) is essential in safeguarding against potential attacks.