wifi: prevent A-MSDU attacks in mesh networks
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
CVE-2025-38512
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-38512
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "79720743421753ff72bfa0d79976c534645b81c1",
"lessThan": "e2c8a3c0388aef6bfc4aabfba07bc7dff16eea80",
"versionType": "git"
},
{
"status": "affected",
"version": "986e43b19ae9176093da35e0a844e65c8bf9ede7",
"lessThan": "ec6392061de6681148b63ee6c8744da833498cdd",
"versionType": "git"
},
{
"status": "affected",
"version": "986e43b19ae9176093da35e0a844e65c8bf9ede7",
"lessThan": "e01851f6e9a665a6011b14714b271d3e6b0b8d32",
"versionType": "git"
},
{
"status": "affected",
"version": "986e43b19ae9176093da35e0a844e65c8bf9ede7",
"lessThan": "6e3b09402cc6c3e3474fa548e8adf6897dda05de",
"versionType": "git"
},
{
"status": "affected",
"version": "986e43b19ae9176093da35e0a844e65c8bf9ede7",
"lessThan": "737bb912ebbe4571195c56eba557c4d7315b26fb",
"versionType": "git"
},
{
"status": "affected",
"version": "6.1.107",
"lessThan": "6.1.146",
"versionType": "semver"
}
],
"programFiles": [
"net/wireless/util.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.146",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.99",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.39",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.15.7",
"versionType": "semver",
"lessThanOrEqual": "6.15.*"
},
{
"status": "unaffected",
"version": "6.16",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/wireless/util.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-38512
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30584 · Revision 1
- Added to Heist Feed
- Publisher date