CVE-2025-71127

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

wifi: mac80211: Discard Beacon frames to non-broadcast address

Beacon frames are required to be sent to the broadcast address, see IEEE

Std 802.11-2020, 11.1.3.1 ("The Address 1 field of the Beacon .. frame

shall be set 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 (e.g., using CSA to move it to another channel). As such, it

is better have strict filtering for this on the received side and

discard all Beacon frames that are sent to an unexpected address.

This is even more important for cases where beacon protection is used.

The current implementation in mac80211 is correctly discarding 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. If the driver does not

have logic for dropping

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References