CVE-2022-47518 : Security Advisory and Response

An issue was discovered in the Linux kernel before 6.0.11. Missing validation of the number of channels in drivers/net/wireless/microchip/wilc1000/cfg80211.c in the WILC1000 wireless driver can trigger a heap-based buffer overflow when copying the list of operating channels from Wi-Fi management frames.

Understanding CVE-2022-47518

This section will delve into the details of CVE-2022-47518, its impact, technical details, and mitigation strategies.

What is CVE-2022-47518?

CVE-2022-47518 is a vulnerability found in the Linux kernel before version 6.0.11. It arises from missing validation of the number of channels in the WILC1000 wireless driver, potentially leading to a heap-based buffer overflow.

The Impact of CVE-2022-47518

The impact of this vulnerability is significant as it can be exploited to trigger a heap-based buffer overflow by copying the list of operating channels from Wi-Fi management frames.

Technical Details of CVE-2022-47518

Let's explore the technical aspects of CVE-2022-47518 in detail.

Vulnerability Description

The vulnerability stems from the lack of proper validation of the number of channels in the WILC1000 wireless driver, allowing for a heap-based buffer overflow.

Affected Systems and Versions

The issue affects the Linux kernel versions prior to 6.0.11, specifically in the WILC1000 wireless driver module.

Exploitation Mechanism

The exploit occurs when copying the list of operating channels from Wi-Fi management frames, leading to the triggering of a heap-based buffer overflow.

Mitigation and Prevention

To safeguard systems from CVE-2022-47518, it is vital to adopt appropriate mitigation strategies.

Immediate Steps to Take

Update the Linux kernel to version 6.0.11 or newer to patch the vulnerability.
Monitor vendor security advisories for any patches or workarounds.

Long-Term Security Practices

Regularly update system components to ensure security patches are applied promptly.
Implement network segmentation and access controls to limit the impact of potential exploits.

Patching and Updates

Stay informed about security updates released by the Linux kernel maintainers.
Test patches in a controlled environment before applying them to production systems.