wifi: mac80211: fix slab-out-of-bounds read in ieee80211_monitor_select_queue()

{
  "id": "939ecb7f30d437ca9e846873faf37f73fb0cc84fb1014efb733a014d507ef214",
  "url": "https://osv.dev/vulnerability/CVE-2026-98810",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: mac80211: fix slab-out-of-bounds read in ieee80211_monitor_select_queue()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: fix slab-out-of-bounds read in ieee80211_monitor_select_queue() ieee80211_monitor_select_queue() validates the skb length using skb->len before dereferencing pointers into skb->data to access the 802.11 header. However, skb->len includes data in both the linear head buffer and non-linear fragments/pages. When AF_PACKET sends a packet large enough to become non-linear, the 802.11 header at skb->data + len_rthdr may extend past the linear head buffer even though skb->len appears sufficient. This leads to a slab-out-of-bounds read when accessing hdr->frame_control, as the kernel reads beyond the allocated skb head buffer: BUG: KASAN: slab-out-of-bounds in ieee80211_monitor_select_queue+0x1ed/0x220 syzbot has hit the same issues. Fix this by checking skb_headlen(skb) (which gives the length of the linear data region) instead of skb->len before dereferencing skb->data pointers. This ensures the required bytes are actually present in the linear portion of the skb. Apply the same fix to ieee80211_validate_radiotap_len() which has the same class of bug: it uses skb->len to validate accesses to skb->data, and to the corresponding checks in ieee80211_monitor_start_xmit(): for drivers advertising NETIF_F_SG the skb is not linearized before ndo_start_xmit, so the 802.11 header can be read past the linear buffer there as well.",
    "evidence": "osv:CVE-2026-98810",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.2.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98810",
      "aliases": [
        "CVE-2026-98810"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9b8a74e3482f9fc077a88c13fa0ceca8feb0b772"
                },
                {
                  "fixed": "63e7064b4c1c4b540bf2f0cba47384f92ab95307"
                },
                {
                  "fixed": "6f63e919fe1e335b8abcb3a28bfd4804a98d875a"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98810.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "2.6.24"
                },
                {
                  "fixed": "7.2.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98810.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.270966857Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/63e7064b4c1c4b540bf2f0cba47384f92ab95307",
        "https://git.kernel.org/stable/c/6f63e919fe1e335b8abcb3a28bfd4804a98d875a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98810.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98810",
        "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-2026-98810.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98810",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 496321,
  "published_at": "2026-10-18T15:48:56.733+00:00"
}