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Fencer Vulns
high 7.1

CVE-2025-71127 json

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

published 2026-01-14 9 mo ago modified 2026-10-19 20 d ago also EUVD-2026-2465

cvss
7.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits
0
none known

Summary

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 unicast Beacon frames with Protected Frame bit 1, these frames would be accepted in mac80211 processing as valid Beacon frames even though they are not protected. This would allow beacon protection to be bypassed. While the logic for checking beacon protection could be extended to cover this corner case, a more generic check for discard all Beacon frames based on A1=unicast address covers this without needing additional changes.

Address all these issues by dropping received Beacon frames if they are sent to a non-broadcast address.

Patch / fix

  • Linux Linux 5.10.248, 5.15.198, 6.1.160, 6.6.120, 6.12.65, 6.18.4, 6.19
  • linux Debian 12 6.1.162-1
  • linux Debian 13 6.12.69-1
  • linux Debian 14 6.18.5-1

debian advisories DEBIAN-CVE-2025-71127

  • linux Ubuntu 22.04 LTS 5.15.0-173.183
  • linux Ubuntu 24.04 LTS 6.8.0-110.110
  • linux Ubuntu 25.10 6.17.0-29.29
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1103.110
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1052.55
  • linux-aws Ubuntu 25.10 6.17.0-1015.15
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1103.112
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1054.57

ubuntu advisories UBUNTU-CVE-2025-71127

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-rt RHEL 8 4.18.0-553.163.1.rt7.504.el8_10
  • kernel-rt-kvm RHEL 8 4.18.0-553.163.1.rt7.504.el8_10
  • kernel-rt-core RHEL 8 4.18.0-553.163.1.rt7.504.el8_10
  • kernel-rt-modules RHEL 8 4.18.0-553.163.1.rt7.504.el8_10
  • kernel-rt-debug-kvm RHEL 8 4.18.0-553.163.1.rt7.504.el8_10
  • kernel-rt-debug-core RHEL 8 4.18.0-553.163.1.rt7.504.el8_10
  • kernel-rt-debug-modules RHEL 8 4.18.0-553.163.1.rt7.504.el8_10
  • kernel-rt-modules-extra RHEL 8 4.18.0-553.163.1.rt7.504.el8_10

red hat advisories RHSA-2026:67469RHSA-2026:67468

  • kernel AlmaLinux 8 4.18.0-553.163.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.163.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.163.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.163.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.163.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.163.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.163.1.el8_10
  • kernel-zfcpdump AlmaLinux 8 4.18.0-553.163.1.el8_10

almalinux advisories ALSA-2026:67468ALSA-2026:67469

  • kernel-rt Rocky Linux 8 4.18.0-553.163.1.rt7.504.el8_10
  • kernel Rocky Linux 8 4.18.0-553.163.1.el8_10

rocky linux advisories RLSA-2026:67469RLSA-2026:67468

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-71127 updated cvss 6.3

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

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernel
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.163.1.el8_10, kernel 4.18.0-553.163.1.el8_10, bpftool 4.18.0-553.163.1.el8_10, kernel-core 4.18.0-553.163.1.el8_10, kernel-tools 4.18.0-553.163.1.el8_10, python3-perf 4.18.0-553.163.1.el8_10, +15 more Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.163.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.163.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.163.1.el8_10
    fixed: vendor fix RHSA-2026:67468
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.163.1.rt7.504.el8_10, kernel-rt-kvm 4.18.0-553.163.1.rt7.504.el8_10, kernel-rt-core 4.18.0-553.163.1.rt7.504.el8_10, kernel-rt-modules 4.18.0-553.163.1.rt7.504.el8_10, kernel-rt-debug-kvm 4.18.0-553.163.1.rt7.504.el8_10, kernel-rt-debug-core 4.18.0-553.163.1.rt7.504.el8_10, +4 more Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.163.1.rt7.504.el8_10, kernel-rt-core 4.18.0-553.163.1.rt7.504.el8_10, kernel-rt-modules 4.18.0-553.163.1.rt7.504.el8_10, kernel-rt-debug-core 4.18.0-553.163.1.rt7.504.el8_10, kernel-rt-debug-modules 4.18.0-553.163.1.rt7.504.el8_10, kernel-rt-modules-extra 4.18.0-553.163.1.rt7.504.el8_10, +2 more
    fixed: vendor fix RHSA-2026:67469
  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.1 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Weakness
  • CWE-20 Improper Input Validation
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.