wifi: mac80211: consume only present negotiated TTLM maps

{
  "id": "ffbf95705c5f0502b17498e5bedd0f47c63250842a97c5c5a20b6049fdfb2803",
  "url": "https://osv.dev/vulnerability/CVE-2026-64223",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2026-64223",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.92",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.34",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-64223",
      "aliases": [
        "CVE-2026-64223"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "8f500fbc6c655976c8062b1f1e55bd0b3095d6c2"
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                {
                  "fixed": "f7d395dc5008168ac5b9c1ac2791e59a6078cca1"
                },
                {
                  "fixed": "2dd9304727c7041df0a599595910bdbe02ad03c5"
                },
                {
                  "fixed": "2becaaeebe230ade1fcd5d0f1cde4d6ee93ec78f"
                },
                {
                  "fixed": "a6e6ccd5bd07155c2add6c74ce1a5e68ad3b95ea"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64223.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.9.0"
                },
                {
                  "fixed": "6.12.92"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.34"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.11"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64223.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.864566374Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2becaaeebe230ade1fcd5d0f1cde4d6ee93ec78f",
        "https://git.kernel.org/stable/c/2dd9304727c7041df0a599595910bdbe02ad03c5",
        "https://git.kernel.org/stable/c/a6e6ccd5bd07155c2add6c74ce1a5e68ad3b95ea",
        "https://git.kernel.org/stable/c/f7d395dc5008168ac5b9c1ac2791e59a6078cca1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64223.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64223",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64223.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64223",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493533,
  "published_at": "2026-07-24T15:23:08.629+00:00"
}