CVE-2026-98810 (GCVE-0-2026-98810)
Vulnerability from cvelistv5
Published
2026-10-18 15:48
Modified
2026-10-19 09:26
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9b8a74e3482f9fc077a88c13fa0ceca8feb0b772
Version: 9b8a74e3482f9fc077a88c13fa0ceca8feb0b772
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mac80211/iface.c",
            "net/mac80211/tx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "63e7064b4c1c4b540bf2f0cba47384f92ab95307",
              "status": "affected",
              "version": "9b8a74e3482f9fc077a88c13fa0ceca8feb0b772",
              "versionType": "git"
            },
            {
              "lessThan": "6f63e919fe1e335b8abcb3a28bfd4804a98d875a",
              "status": "affected",
              "version": "9b8a74e3482f9fc077a88c13fa0ceca8feb0b772",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/mac80211/iface.c",
            "net/mac80211/tx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.24"
            },
            {
              "lessThan": "2.6.24",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.10",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: fix slab-out-of-bounds read in ieee80211_monitor_select_queue()\n\nieee80211_monitor_select_queue() validates the skb length using skb-\u003elen\nbefore dereferencing pointers into skb-\u003edata to access the 802.11 header.\nHowever, skb-\u003elen includes data in both the linear head buffer and\nnon-linear fragments/pages. When AF_PACKET sends a packet large enough to\nbecome non-linear, the 802.11 header at skb-\u003edata + len_rthdr may extend\npast the linear head buffer even though skb-\u003elen appears sufficient.\n\nThis leads to a slab-out-of-bounds read when accessing hdr-\u003eframe_control,\nas the kernel reads beyond the allocated skb head buffer:\n\n  BUG: KASAN: slab-out-of-bounds in ieee80211_monitor_select_queue+0x1ed/0x220\n\nsyzbot has hit the same issues.\n\nFix this by checking skb_headlen(skb) (which gives the length of the\nlinear data region) instead of skb-\u003elen before dereferencing skb-\u003edata\npointers. This ensures the required bytes are actually present in the\nlinear portion of the skb.\n\nApply the same fix to ieee80211_validate_radiotap_len() which has the\nsame class of bug: it uses skb-\u003elen to validate accesses to skb-\u003edata,\nand to the corresponding checks in ieee80211_monitor_start_xmit(): for\ndrivers advertising NETIF_F_SG the skb is not linearized before\nndo_start_xmit, so the 802.11 header can be read past the linear\nbuffer there as well."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:26:03.626Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/63e7064b4c1c4b540bf2f0cba47384f92ab95307"
        },
        {
          "url": "https://git.kernel.org/stable/c/6f63e919fe1e335b8abcb3a28bfd4804a98d875a"
        }
      ],
      "title": "wifi: mac80211: fix slab-out-of-bounds read in ieee80211_monitor_select_queue()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98810",
    "datePublished": "2026-10-18T15:48:56.733Z",
    "dateReserved": "2026-09-25T10:25:14.371Z",
    "dateUpdated": "2026-10-19T09:26:03.626Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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