CVE-2026-98340 (GCVE-0-2026-98340)
Vulnerability from cvelistv5
Published
2026-10-06 08:46
Modified
2026-10-19 09:17
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: only group hidden BSSes with beacon entries When a probe response for an unknown BSS comes in, __cfg80211_bss_update() looks for an existing entry with the same BSSID and a hidden (zero-length or NUL-filled) SSID, and if it finds one it groups them, using the beacon IEs from the existing entry. But that could find another entry without a beacon, if it was also from a probe response (with SSID), so there's a group without beacon elements. If a beacon with a hidden SSID for that BSSID arrives later, cfg80211_combine_bsses() goes looking for the probe response entries that belong to it - i.e. entries with the same BSSID and channel that have no beacon IEs - and finds those two. They are already grouped with each other, so it hits its WARN_ON_ONCE(bss->pub.hidden_beacon_bss) WARN_ON_ONCE(!list_empty(&bss->hidden_list)) which are there because an entry without beacon elements is not supposed to be part of a group yet. Only combine entries when a beacon was already received, ones that are kept separate will be combined when a beacon arrives.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc
Version: 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc
Version: 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc
Version: 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc
Version: 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc
Version: 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc
Version: 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc
Version: 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/wireless/scan.c"
          ],
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          "product": "Linux",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.9"
            },
            {
              "lessThan": "3.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "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:*:*:*:*:*:*:*:*",
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                {
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                  "versionEndExcluding": "7.3",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: only group hidden BSSes with beacon entries\n\nWhen a probe response for an unknown BSS comes in, __cfg80211_bss_update()\nlooks for an existing entry with the same BSSID and a hidden (zero-length\nor NUL-filled) SSID, and if it finds one it groups them, using the beacon\nIEs from the existing entry.\n\nBut that could find another entry without a beacon, if it was also from a\nprobe response (with SSID), so there\u0027s a group without beacon elements.\n\nIf a beacon with a hidden SSID for that BSSID arrives later,\ncfg80211_combine_bsses() goes looking for the probe response entries that\nbelong to it - i.e. entries with the same BSSID and channel that have no\nbeacon IEs - and finds those two. They are already grouped with each\nother, so it hits its\n\n  WARN_ON_ONCE(bss-\u003epub.hidden_beacon_bss)\n  WARN_ON_ONCE(!list_empty(\u0026bss-\u003ehidden_list))\n\nwhich are there because an entry without beacon elements is not supposed\nto be part of a group yet.\n\nOnly combine entries when a beacon was already received, ones that are\nkept separate will be combined when a beacon arrives."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:17:51.387Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4cd6a518ce7527284bbc9baab5fa2453a7d477c2"
        },
        {
          "url": "https://git.kernel.org/stable/c/74ed0d992f392c75e1969415527e06df3f7a4034"
        },
        {
          "url": "https://git.kernel.org/stable/c/3658093df69849daf4f813a8f087f358e13be203"
        },
        {
          "url": "https://git.kernel.org/stable/c/73365b81630b57e1a1f9d50dc87281797855c2ac"
        },
        {
          "url": "https://git.kernel.org/stable/c/7405dd19bda4537a2843637d8d7bed1efd4776cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/86235be788094131912e9bd8412b358d91d99f49"
        },
        {
          "url": "https://git.kernel.org/stable/c/332ea1502c46f53375cb109fa82bfaff818f3a41"
        },
        {
          "url": "https://git.kernel.org/stable/c/068843ed0902c552a13860c5ec6b2ca65b57a065"
        }
      ],
      "title": "wifi: cfg80211: only group hidden BSSes with beacon entries",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98340",
    "datePublished": "2026-10-06T08:46:30.796Z",
    "dateReserved": "2026-09-25T10:25:14.342Z",
    "dateUpdated": "2026-10-19T09:17:51.387Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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