wifi: mac80211: avoid out-of-bounds read for empty PREQ elements

{
  "id": "a089358173cce7aae6df4e041441dd11078700a4006320b7ee8d28e365b2bb3f",
  "url": "https://osv.dev/vulnerability/CVE-2026-98183",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: mac80211: avoid out-of-bounds read for empty PREQ elements",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: avoid out-of-bounds read for empty PREQ elements ieee80211_mesh_preq_size_ok() derives the location of the PREQ bottom fields before checking whether the element contains even the fixed header. ieee80211_mesh_hwmp_preq_get_bottom() reads the flags byte to account for the optional Address Extension field. Consequently, an empty PREQ element causes a one-byte read beyond its declared payload. Move the helper call after both size checks, so the bottom fields are only accessed when they are present.",
    "evidence": "osv:CVE-2026-98183",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.2.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98183",
      "aliases": [
        "CVE-2026-98183"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "8b40b1d24a6099fe9fac8e207d4cb04ab5e0baae"
                },
                {
                  "fixed": "3beddbd56946577478fd5e649f556aaaebe15b0a"
                },
                {
                  "fixed": "e6031f02269c0f51cf67886d177f02bc300b47cd"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98183.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "7.2.0"
                },
                {
                  "fixed": "7.2.8"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98183.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.288726890Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3beddbd56946577478fd5e649f556aaaebe15b0a",
        "https://git.kernel.org/stable/c/e6031f02269c0f51cf67886d177f02bc300b47cd",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98183.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98183",
        "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/2026/98xxx/CVE-2026-98183.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98183",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 505809,
  "published_at": "2026-10-06T08:44:26.024+00:00"
}