wifi: mt76: mt7996: fix out-of-bounds link array access in mt7996_tx()

{
  "id": "48901d1bd6d3ca7a6fb9a3fa28bd768eb28be76bcce97d16055aa14f6cb13228",
  "url": "https://osv.dev/vulnerability/CVE-2026-90349",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: mt76: mt7996: fix out-of-bounds link array access in mt7996_tx()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7996: fix out-of-bounds link array access in mt7996_tx() When mac80211 leaves the link unspecified, mt7996_tx() substitutes the primary link id of the station or vif. That value is IEEE80211_LINK_UNSPECIFIED (0xf) until the first link has been added, and it is then used unchecked to index vif->link_conf[], mvif->mt76.link[] and sta->link[], all of which hold IEEE80211_MLD_MAX_NUM_LINKS (15) entries. Clamp the primary link id to the default link before using it, and use the clamped value for the link_sta fallback as well.",
    "evidence": "osv:CVE-2026-90349",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-90349",
      "aliases": [
        "CVE-2026-90349"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1609b014aa29f9a2bf3aaa93f71de4a06725845e"
                },
                {
                  "fixed": "637bb99cc766a858d744905e46638459ca128b6c"
                },
                {
                  "fixed": "aff81505a84d27f83b4db8e039e813930cb23c2c"
                },
                {
                  "fixed": "4330a0ef9f75a54fde3548432a9a698f06bab635"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90349.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.18.0"
                },
                {
                  "fixed": "6.18.52"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90349.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.870193957Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4330a0ef9f75a54fde3548432a9a698f06bab635",
        "https://git.kernel.org/stable/c/637bb99cc766a858d744905e46638459ca128b6c",
        "https://git.kernel.org/stable/c/aff81505a84d27f83b4db8e039e813930cb23c2c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90349.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90349",
        "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/2026/90xxx/CVE-2026-90349.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90349",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 491600,
  "published_at": "2026-09-17T16:08:57.539+00:00"
}