Monitor Mode Vulnerability in Linux Kernel Affecting Wireless Devices

CVE-2025-38642

What is CVE-2025-38642?

A vulnerability has been identified in the Linux kernel's mac80211 component, particularly impacting the handling of monitor mode on wireless devices. The issue arises when specific settings are attempted to be changed for monitor interfaces on devices lacking proper support for channel context. Instead of effectively managing link settings, a warning (WARN_ON) is triggered, indicating a problem rather than resolving it. The fix addresses the oversight by implementing checks in the link change code to facilitate smoother updates and eliminate unnecessary warnings, enhancing the stability and security of wireless operations.

References