wifi: rtw89: add bounds check on firmware mac_id in link lookup

{
  "id": "a03e07bae1429422b1cbdd2de805826094bc96fab798ef68d958b99568eb025f",
  "url": "https://osv.dev/vulnerability/CVE-2026-74409",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: rtw89: add bounds check on firmware mac_id in link lookup",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: rtw89: add bounds check on firmware mac_id in link lookup The mac_id field in RX descriptors is 8 bits wide (0-255), but assoc_link_on_macid[] has only RTW89_MAX_MAC_ID_NUM (128) entries. While the driver currently assigns mac_id values below 128, the descriptor value comes from firmware and is not validated before use as an array index. Add a defensive bounds check in rtw89_assoc_link_rcu_dereference() to guard against out-of-range firmware values.",
    "evidence": "osv:CVE-2026-74409",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.40",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-74409",
      "aliases": [
        "CVE-2026-74409"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "144c6cd24b3556e6e7a14271cee57a42ebf97450"
                },
                {
                  "fixed": "ad445de67359f24088d4305c05fbd7e34c4e35e3"
                },
                {
                  "fixed": "920101305e7601a33b9e01019f4ca526af2526ae"
                },
                {
                  "fixed": "6d88244bb129755acca696f9227200f4a2d106a6"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74409.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.14.0"
                },
                {
                  "fixed": "6.18.40"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74409.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.521527553Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/6d88244bb129755acca696f9227200f4a2d106a6",
        "https://git.kernel.org/stable/c/920101305e7601a33b9e01019f4ca526af2526ae",
        "https://git.kernel.org/stable/c/ad445de67359f24088d4305c05fbd7e34c4e35e3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74409.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74409",
        "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/2026/74xxx/CVE-2026-74409.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-74409",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496407,
  "published_at": "2026-08-15T05:59:17.361+00:00"
}