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wifi: mac80211: Discard Beacon frames to non-broadcast address (Linux Linux)

CVE-2025-71127
HIGH 7.1

At a glance

Source
NVD
EPSS
EPSS 0.23 % · percentile 14 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Modified

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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 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.

Weaknesses (CWE)

  • CWE-20 — Improper Input Validation

References

Scores

VersionScoreVectorScored by
CVSS 3.1HIGH 7.1CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:HLinux
CVSS 3.1HIGH 7.1CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)
CVSS 3.1MEDIUM 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Linux · Linuxaffected af2d14b01c32d7cba65f73503586e5b621afb139 < be0974be5c42584e027883ac2af7dab5e950098c ; affected af2d14b01c32d7cba65f73503586e5b621afb139 < 0a59a3895f804469276d188effa511c72e752f35 ; affected af2d14b01c32d7cba65f73503586e5b621afb139 < 88aab153d1528bc559292a12fb5105ee97528e1f ; affected af2d14b01c32d7cba65f73503586e5b621afb139 < 6e5bff40bb38741e40c33043ba0816fba5f93661 ; affected af2d14b01c32d7cba65f73503586e5b621afb139 < 7b240a8935d554ad36a52c2c37c32039f9afaef2 ; affected af2d14b01c32d7cba65f73503586e5b621afb139 < a21704df4024708be698fb3fd5830d5b113b70e0
Linux · Linuxaffected 5.7 ; unaffected 0 < 5.7 ; unaffected 5.10.248 ≤ 5.10.* ; unaffected 5.15.198 ≤ 5.15.* ; unaffected 6.1.160 ≤ 6.1.* ; unaffected 6.6.120 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD