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wifi: prevent A-MSDU attacks in mesh networks (Linux Linux)

CVE-2025-38512
HIGH 8.8

At a glance

Source
NVD
EPSS
EPSS 0.24 % · percentile 15 ()
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: prevent A-MSDU attacks in mesh networks This patch is a mitigation to prevent the A-MSDU spoofing vulnerability for mesh networks. The initial update to the IEEE 802.11 standard, in response to the FragAttacks, missed this case (CVE-2025-27558). It can be considered a variant of CVE-2020-24588 but for mesh networks. This patch tries to detect if a standard MSDU was turned into an A-MSDU by an adversary. This is done by parsing a received A-MSDU as a standard MSDU, calculating the length of the Mesh Control header, and seeing if the 6 bytes after this header equal the start of an rfc1042 header. If equal, this is a strong indication of an ongoing attack attempt. This defense was tested with mac80211_hwsim against a mesh network that uses an empty Mesh Address Extension field, i.e., when four addresses are used, and when using a 12-byte Mesh Address Extension field, i.e., when six addresses are used. Functionality of normal MSDUs and A-MSDUs was also tested, and confirmed working, when using both an empty and 12-byte Mesh Address Extension field. It was also tested with mac80211_hwsim that A-MSDU attacks in non-mesh networks keep being detected and prevented. Note that the vulnerability being patched, and the defense being implemented, was also discussed in the following paper and in the following IEEE 802.11 presentation: https://papers.mathyvanhoef.com/wisec2025.pdf https://mentor.ieee.org/802.11/dcn/25/11-25-0949-00-000m-a-msdu-mesh-spoof-protection.docx

References

Scores

VersionScoreVectorScored by
CVSS 3.1HIGH 8.8CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HLinux
CVSS 3.1HIGH 8.8CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · nvd@nist.gov (Primary)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Linux · Linuxaffected 79720743421753ff72bfa0d79976c534645b81c1 < e2c8a3c0388aef6bfc4aabfba07bc7dff16eea80 ; affected 986e43b19ae9176093da35e0a844e65c8bf9ede7 < ec6392061de6681148b63ee6c8744da833498cdd ; affected 986e43b19ae9176093da35e0a844e65c8bf9ede7 < e01851f6e9a665a6011b14714b271d3e6b0b8d32 ; affected 986e43b19ae9176093da35e0a844e65c8bf9ede7 < 6e3b09402cc6c3e3474fa548e8adf6897dda05de ; affected 986e43b19ae9176093da35e0a844e65c8bf9ede7 < 737bb912ebbe4571195c56eba557c4d7315b26fb ; affected 6.1.107 < 6.1.146
Linux · Linuxaffected 6.3 ; unaffected 0 < 6.3 ; unaffected 6.1.146 ≤ 6.1.* ; unaffected 6.6.99 ≤ 6.6.* ; unaffected 6.12.39 ≤ 6.12.* ; unaffected 6.15.7 ≤ 6.15.*

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