CVE-2026-64223 (GCVE-0-2026-64223)
Vulnerability from cvelistv5 – Published: 2026-07-24 15:23 – Updated: 2026-10-19 20:28
VLAI
EPSS
VEX
Title
wifi: mac80211: consume only present negotiated TTLM maps
Summary
In the Linux kernel, the following vulnerability has been resolved:
wifi: mac80211: consume only present negotiated TTLM maps
ieee80211_tid_to_link_map_size_ok() validates negotiated TTLM elements
against the number of link-map entries indicated by link_map_presence.
ieee80211_parse_neg_ttlm() must consume the same layout.
The parser advanced its cursor for every TID, including TIDs whose
presence bit is clear and therefore have no map bytes in the element.
A sparse map can then make a later present TID read past the validated
element.
The bad bytes land in neg_ttlm->{up,down}link[tid] but are gated by
valid_links before being applied to driver state, so a peer cannot
turn the read into a policy change. Under KUnit + KASAN with an
exact-sized element allocation the OOB read is reported as a
slab-out-of-bounds; whether the same trigger fires under the
production RX path depends on surrounding allocator state.
Advance the cursor only when the current TID has a map present.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:37 UTC
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 , < f7d395dc5008168ac5b9c1ac2791e59a6078cca1
(git)
Affected: 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 , < 2dd9304727c7041df0a599595910bdbe02ad03c5 (git) Affected: 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 , < 2becaaeebe230ade1fcd5d0f1cde4d6ee93ec78f (git) Affected: 8f500fbc6c655976c8062b1f1e55bd0b3095d6c2 , < a6e6ccd5bd07155c2add6c74ce1a5e68ad3b95ea (git) |
guessed | |
| Linux | Linux |
Affected:
6.9
Unaffected: 0 , < 6.9 (semver) Unaffected: 6.12.92 , ≤ 6.12.* (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
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"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.92",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.34",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0.11",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1",
"versionStartIncluding": "6.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: consume only present negotiated TTLM maps\n\nieee80211_tid_to_link_map_size_ok() validates negotiated TTLM elements\nagainst the number of link-map entries indicated by link_map_presence.\nieee80211_parse_neg_ttlm() must consume the same layout.\n\nThe parser advanced its cursor for every TID, including TIDs whose\npresence bit is clear and therefore have no map bytes in the element.\nA sparse map can then make a later present TID read past the validated\nelement.\n\nThe bad bytes land in neg_ttlm-\u003e{up,down}link[tid] but are gated by\nvalid_links before being applied to driver state, so a peer cannot\nturn the read into a policy change. Under KUnit + KASAN with an\nexact-sized element allocation the OOB read is reported as a\nslab-out-of-bounds; whether the same trigger fires under the\nproduction RX path depends on surrounding allocator state.\n\nAdvance the cursor only when the current TID has a map present."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - A malicious or spoofed Wi-Fi 7 MLO peer can trigger the parser using an over-the-air Protected EHT TTLM request, requiring radio-network adjacency.\nAC:L - A crafted sparse link_map_presence deterministically causes the invalid cursor advancement and OOB read; no race or condition outside the attacker\u2019s control is required to reach the flaw.\nPR:N - The attacker needs no local account, capability, or target-system privilege; an associated malicious AP/MLD peer can supply the frame.\nUI:N - Once the station is connected to the malicious or compromised AP, the crafted management frame is processed automatically without user action.\nS:U - The vulnerable parser and resulting impacts remain within the host kernel\u2019s existing security authority and do not cross a VM, IOMMU, or sandbox boundary.\nC:H - Sparse maps cause multiple one- or two-byte reads beyond the validated element into surrounding kernel allocation state. Applying the required higher-severity choice for an OOB kernel read, potential disclosure of adjacent kernel memory is scored High.\nI:N - All writes remain within the bounded neg_ttlm arrays, and parsed link values are checked against valid_links before driver-state application; there is no OOB write or control-flow corruption primitive.\nA:H - An exact-sized allocation produces a KASAN slab-out-of-bounds report, which can panic sanitizer-enabled kernels, and the peer can repeatedly send the trigger. Although production behavior depends on RX-buffer allocation state, the required higher-severity choice supports High."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:40:10.599Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/f7d395dc5008168ac5b9c1ac2791e59a6078cca1"
},
{
"url": "https://git.kernel.org/stable/c/2dd9304727c7041df0a599595910bdbe02ad03c5"
},
{
"url": "https://git.kernel.org/stable/c/2becaaeebe230ade1fcd5d0f1cde4d6ee93ec78f"
},
{
"url": "https://git.kernel.org/stable/c/a6e6ccd5bd07155c2add6c74ce1a5e68ad3b95ea"
}
],
"title": "wifi: mac80211: consume only present negotiated TTLM maps",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64223",
"datePublished": "2026-07-24T15:23:08.629Z",
"dateReserved": "2026-07-19T15:36:31.770Z",
"dateUpdated": "2026-10-16T15:42:26.703Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.