CVE-2026-98340 (GCVE-0-2026-98340)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:46 – Updated: 2026-10-06 08:46
VLAI
Title
wifi: cfg80211: only group hidden BSSes with beacon entries
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc , < 4cd6a518ce7527284bbc9baab5fa2453a7d477c2 (git)
Affected: 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc , < 74ed0d992f392c75e1969415527e06df3f7a4034 (git)
Affected: 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc , < 3658093df69849daf4f813a8f087f358e13be203 (git)
Affected: 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc , < 73365b81630b57e1a1f9d50dc87281797855c2ac (git)
Affected: 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc , < 7405dd19bda4537a2843637d8d7bed1efd4776cf (git)
Affected: 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc , < 86235be788094131912e9bd8412b358d91d99f49 (git)
Affected: 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc , < 332ea1502c46f53375cb109fa82bfaff818f3a41 (git)
Affected: 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc , < 068843ed0902c552a13860c5ec6b2ca65b57a065 (git)
Create a notification for this product.
Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.54 , ≤ 6.18.* (semver)
Unaffected: 7.2.8 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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          "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."
        }
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    "dateReserved": "2026-09-25T10:25:14.342Z",
    "dateUpdated": "2026-10-06T08:46:30.796Z",
    "state": "PUBLISHED"
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            "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."
          }
        ],
        "id": "CVE-2026-98340",
        "lastModified": "2026-10-06T09:18:26.720",
        "metrics": {},
        "published": "2026-10-06T09:18:26.720",
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            "url": "https://git.kernel.org/stable/c/86235be788094131912e9bd8412b358d91d99f49"
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-08T16:47:11Z",
      "cve": "CVE-2026-98340",
      "id": "CVE-2026-98340",
      "initial_release_date": "2026-10-08T16:47:11Z",
      "product_status:known_affected": "297",
      "product_status:known_not_affected": "50",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98340",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-98340.json",
      "version": "2"
    }
  }
}



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