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CVE-2026-98339

Estado: RecibidaAlta (8.8)—

In the Linux kernel, the following vulnerability has been resolved:

wifi: cfg80211: don't filter by BSS type when removing stale entries

When an assoc AP switches to a channel that already has a BSS entry, cfg80211_update_assoc_bss_entry() removes that entry before rehashing the real one, since the two would otherwise collide in the BSS rbtree.

The lookup for that entry also required it to match the connection's BSS type, so an entry advertising e.g. the IBSS capability bit was left in place, and the following cfg80211_rehash_bss() then ran into it:

Changing the type shouldn't really happen, but can be triggered by a rogue AP/device, so drop the check and remove any entries matching the comparison.

Detalles técnicos trazas, registros y código del informe original
  WARN_ON(!cmp)

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:A requiere red adyacente (T1210). Un AP rogue en el mismo segmento desencadena un WARN_ON que causa inestabilidad del kernel (DoS) o potencial escalada si explota la condición de carrera en el rbtree.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramApplication Isolation and SandboxingExploit ProtectionUpdate SoftwareVulnerability ScanningPrivileged Account Management

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-98339",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      }
    ]
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  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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        {
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              "version": "5.4"
            },
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            {
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            {
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              "version": "5.15.222",
              "versionType": "semver",
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            },
            {
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver",
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            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
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            },
            {
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              "version": "6.12.112",
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            },
            {
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              "version": "6.18.54",
              "versionType": "semver",
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            },
            {
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver",
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            },
            {
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/wireless/scan.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-10-06T09:18:26.560",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0aa44982125c86b47961be5ac1c82eddab8080f3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: don't filter by BSS type when removing stale entries\n\nWhen an assoc AP switches to a channel that already has a BSS entry,\ncfg80211_update_assoc_bss_entry() removes that entry before rehashing\nthe real one, since the two would otherwise collide in the BSS rbtree.\n\nThe lookup for that entry also required it to match the connection's BSS\ntype, so an entry advertising e.g. the IBSS capability bit was left in\nplace, and the following cfg80211_rehash_bss() then ran into it:\n\n  WARN_ON(!cmp)\n\nChanging the type shouldn't really happen, but can be triggered by a\nrogue AP/device, so drop the check and remove any entries matching\nthe comparison."
    }
  ],
  "lastModified": "2026-10-07T07:17:09.540",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}