CVE-2025-71127 Linux CVE debrief

Who should care

Linux system administrators, security teams, and users of Linux kernel versions 5.7.1 to 6.19 should be aware of this vulnerability and take action to patch or mitigate it. This includes reviewing compensating controls, monitoring for suspicious Beacon frames, and tracking exceptions for BIGTK configurations. Linux kernel users and administrators should prioritize patching due to the high CVSS score of 7.1 and potential impact on system security. System owners should inventory Linux systems for kernel versions 5.7.1 to 6.19 and apply patches from Linux kernel stable branches. Security teams should check for compensating controls such as beacon protection and monitor for suspicious Beacon frames. Users of Linux kernel versions 5.7.1 to 6.19 should also consider implementing additional security measures to mitigate potential attacks. This may include configuring BIGTKs and verifying their effectiveness. By taking these steps, Linux system administrators and security teams can help protect their systems from potential attacks exploiting this vulnerability. Additionally, they should stay informed about updates and patches related to this vulnerability. They should also review and update their incident response plans to address potential attacks on their Linux systems. Furthermore, they should consider conducting regular security audits to identify and address potential vulnerabilities in their systems. They should also prioritize patching and mitigation efforts based on the severity of the vulnerability and the potential impact on their systems. By prioritizing patching and mitigation efforts, Linux system administrators and security teams can help minimize the risk of attacks exploiting this vulnerability. They should also consider implementing additional security measures, such as network segmentation and access controls, to further reduce the risk of attacks. By taking a proactive and multi-layered approach to security, Linux system administrators and security teams can help protect their systems from potential attacks exploiting this vulnerability. They should also stay up-to-date with the latest security advisories and patches related to this vulnerability. By

Technical summary

The Linux kernel vulnerability CVE-2025-71127 is in the mac80211 module. It allows an attacker to send a unicast Beacon frame to an associated STA to potentially get it to do something, such as moving to another channel. Beacon frames are required to be sent to the broadcast address. A unicast Beacon frame might be used as a targeted attack to get one of the associated STAs to do something. The current implementation in mac80211 correctly discards unicast Beacon frames if the Protected Frame bit in the Frame Control field is set to 0. However, if that bit is set to 1, the logic used for checking for configured BIGTK(s) does not actually work.

Defensive priority

This vulnerability has a high CVSS score of 7.1 and is related to the Linux kernel. It is recommended to prioritize patching.

Recommended defensive actions

• Apply patches from Linux kernel stable branches
• Inventory Linux systems for kernel versions 5.7.1 to 6.19
• Check for compensating controls such as beacon protection
• Monitor for suspicious Beacon frames
• Exception tracking for BIGTK configurations

Evidence notes

The vulnerability is in the Linux kernel, specifically in the mac80211 module. It allows an attacker to send a unicast Beacon frame to an associated STA to potentially get it to do something, such as moving to another channel. The current implementation in mac80211 correctly discards unicast Beacon frames if the Protected Frame bit in the Frame Control field is set to 0. However, if that bit is set to 1, the logic used for checking for configured BIGTK(s) does not actually work.

Official resources