wifi: mac80211: disconnect on CSA to channel 0

{
  "id": "33013819990022336aa635e22faaf6eb8c3fb3bc9f112d567612cbf16ec8a0d6",
  "url": "https://osv.dev/vulnerability/CVE-2026-90344",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: mac80211: disconnect on CSA to channel 0",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: disconnect on CSA to channel 0 The refactor for the CSA parsing erroneously equates channel zero and no information present, leading it to ignore a CSA on an AP that advertises a switch to that (invalid) channel. This leads to not disconnecting, which we should. For Intel devices, this can lead to a firmware crash. Fix this by using an int type for the channel number as well as the opclass, and using a (negative) value that cannot be encoded in the element to indicate it's not present.",
    "evidence": "osv:CVE-2026-90344",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-90344",
      "aliases": [
        "CVE-2026-90344"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "21c3f8f95554feff9bed15703e89adbe582e0383"
                },
                {
                  "fixed": "099aadb2012d7490bc584cc5075ef11cbc33f2c3"
                },
                {
                  "fixed": "e7bc5ab93acd1c3f54feeb9fa19ead3530168090"
                },
                {
                  "fixed": "eef374088450bb91626e133c7172b8a0e969a522"
                },
                {
                  "fixed": "cf57f0a674cc3e3cda1a789359cc1238b61b9d7d"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90344.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.9.0"
                },
                {
                  "fixed": "6.12.110"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "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-2026-90344.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.165405039Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/099aadb2012d7490bc584cc5075ef11cbc33f2c3",
        "https://git.kernel.org/stable/c/cf57f0a674cc3e3cda1a789359cc1238b61b9d7d",
        "https://git.kernel.org/stable/c/e7bc5ab93acd1c3f54feeb9fa19ead3530168090",
        "https://git.kernel.org/stable/c/eef374088450bb91626e133c7172b8a0e969a522",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90344.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90344",
        "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-2026-90344.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90344",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 489712,
  "published_at": "2026-09-17T16:08:54.311+00:00"
}