CVE-2022-42721 Explained : Impact and Mitigation

A list management bug in BSS handling in the mac80211 stack in the Linux kernel 5.1 through 5.19.x before 5.19.16 could be used by local attackers to corrupt a linked list and potentially execute code.

Understanding CVE-2022-42721

This CVE involves a vulnerability in the mac80211 stack in certain versions of the Linux kernel that could allow local attackers to trigger code execution.

What is CVE-2022-42721?

CVE-2022-42721 is a list management bug in BSS handling in the Linux kernel 5.1 through 5.19.x before version 5.19.16. Attackers with the ability to inject WLAN frames can exploit this vulnerability to corrupt a linked list, leading to potential code execution.

The Impact of CVE-2022-42721

The impact of this CVE is significant as it allows local attackers to manipulate the mac80211 stack in the affected Linux kernel versions, potentially leading to arbitrary code execution and compromising system integrity.

Technical Details of CVE-2022-42721

This section provides a deeper insight into the technical aspects of CVE-2022-42721.

Vulnerability Description

The vulnerability arises from an issue in BSS handling within the mac80211 stack, which can be abused by attackers to tamper with a linked list and exploit it for executing malicious code.

Affected Systems and Versions

The Linux kernel versions 5.1 through 5.19.x before 5.19.16 are impacted by this vulnerability. Systems running these versions are at risk of exploitation by local attackers with WLAN frame injection capabilities.

Exploitation Mechanism

Attackers with local access and the ability to inject WLAN frames can exploit the bug in BSS handling to corrupt the linked list, potentially achieving code execution on the target system.

Mitigation and Prevention

Protecting systems from CVE-2022-42721 requires a combination of immediate actions and long-term security practices.

Immediate Steps to Take

Immediately apply patches or updates provided by Linux distributions and kernel maintainers to address the vulnerability. Network segmentation and access control can also limit the exposure of vulnerable systems.

Long-Term Security Practices

Regularly monitor for security advisories and updates related to the Linux kernel and implement a proactive security posture that includes regular vulnerability assessments and security training for IT personnel.

Patching and Updates

Stay informed about patches released by official sources to address CVE-2022-42721. Timely patching is crucial to remediate the vulnerability and strengthen the security of Linux systems.