CVE-2022-42720 : What You Need to Know

Various refcounting bugs in the multi-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 (able to inject WLAN frames) to trigger use-after-free conditions to potentially execute code.

Understanding CVE-2022-42720

This CVE involves refcounting bugs in the multi-BSS handling in the mac80211 stack in specific versions of the Linux kernel, allowing local attackers to potentially execute code.

What is CVE-2022-42720?

CVE-2022-42720 pertains to vulnerabilities in the Linux kernel versions 5.1 through 5.19.x, enabling local attackers to exploit use-after-free conditions by leveraging certain bugs in the multi-BSS handling within the mac80211 stack.

The Impact of CVE-2022-42720

The impact of this vulnerability is significant as it allows local attackers to inject WLAN frames, leading to the execution of potentially malicious code, posing a serious threat to system security.

Technical Details of CVE-2022-42720

This section delves deeper into the technical aspects of the CVE.

Vulnerability Description

The vulnerability arises from refcounting bugs within the multi-BSS handling in the mac80211 stack, paving the way for local attackers to exploit use-after-free conditions.

Affected Systems and Versions

Linux kernel versions 5.1 through 5.19.x before 5.19.16 are affected by this vulnerability, impacting systems utilizing these specific versions.

Exploitation Mechanism

Local attackers with the capability to inject WLAN frames can exploit the refcounting bugs to trigger use-after-free conditions, subsequently enabling the execution of arbitrary code.

Mitigation and Prevention

To safeguard systems from CVE-2022-42720, immediate actions and long-term security practices are essential.

Immediate Steps to Take

It is crucial to apply the necessary patches and updates provided by Linux distributors to mitigate the risk associated with this vulnerability.

Long-Term Security Practices

Employing robust network security measures, restricting access rights, and maintaining up-to-date security protocols are crucial for long-term protection against potential threats.

Patching and Updates

Regularly updating the Linux kernel to version 5.19.16 or newer is paramount, along with staying informed about security advisories and promptly applying patches to address known vulnerabilities.