« Volver al listado

CVE-2026-89524

Estado: RecibidaAlta (8.1)—

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

wifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets

ath6kl_cfg80211_connect_event() subtracts fixed IE offsets from assoc_req_len (-= 4) and assoc_resp_len (-= 6), both u8, with no lower bound. The aggregate check recently added to ath6kl_wmi_connect_event_rx() bounds the declared lengths from above (their sum must fit the received event), but an assoc request/response shorter than its fixed offset still underflows here: the u8 wraps to ~250, and cfg80211_connect_result() / cfg80211_roamed() then treat that wrapped value as the IE length and copy that many bytes out of the small assoc_info buffer to user space via nl80211, disclosing adjacent slab memory.

Leer descripción completaMostrar menos

Clamp both lengths to their offsets before subtracting.

Found by 0sec (https://0sec.ai) using automated source analysis; the missing lower bound is evident from source. Compile-tested.

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.

Vulnerabilidad de integer underflow en controlador WiFi ath6kl del kernel Linux que permite a atacante en red adyacente (AV:A) leer memoria del kernel mediante disclosure de slab memory adyacente; T1210 por acceso red adyacente sin privilegios, T1005 por acceso a datos de memoria del sistema.

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

Privileged Account ManagementUpdate SoftwareActive Directory ConfigurationVulnerability ScanningUser TrainingThreat Intelligence Program

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)

Mostrar
{
  "id": "CVE-2026-89524",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.1,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
              "lessThan": "225587bdbf4b0eb5265a71ee4dc183561a1857fc",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
              "lessThan": "d337213a889705a69735079606d0b4c672b17605",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
              "lessThan": "e11d5ae96d5e52cb48fa27c6ad352d766d0322fb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
              "lessThan": "6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
              "lessThan": "e3619bed5da125713b29ac881dc66f5e06606f88",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
              "lessThan": "e1330d719c047c4d8190a16be034b29fc601a815",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
              "lessThan": "8eb73016fb3968cf2db3987a92764563a3af773a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bdcd81707973cf8aa9305337166f8ee842a050d4",
              "lessThan": "3bbd05723d15dd06f0560bcd94fbf9a91b5f5613",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/net/wireless/ath/ath6kl/cfg80211.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.2"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "3.2",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/wireless/ath/ath6kl/cfg80211.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-11T20:19:35.137",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/225587bdbf4b0eb5265a71ee4dc183561a1857fc",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3bbd05723d15dd06f0560bcd94fbf9a91b5f5613",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8eb73016fb3968cf2db3987a92764563a3af773a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d337213a889705a69735079606d0b4c672b17605",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e11d5ae96d5e52cb48fa27c6ad352d766d0322fb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e1330d719c047c4d8190a16be034b29fc601a815",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e3619bed5da125713b29ac881dc66f5e06606f88",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets\n\nath6kl_cfg80211_connect_event() subtracts fixed IE offsets from\nassoc_req_len (-= 4) and assoc_resp_len (-= 6), both u8, with no lower\nbound. The aggregate check recently added to ath6kl_wmi_connect_event_rx()\nbounds the declared lengths from above (their sum must fit the received\nevent), but an assoc request/response shorter than its fixed offset still\nunderflows here: the u8 wraps to ~250, and cfg80211_connect_result() /\ncfg80211_roamed() then treat that wrapped value as the IE length and copy\nthat many bytes out of the small assoc_info buffer to user space via\nnl80211, disclosing adjacent slab memory.\n\nClamp both lengths to their offsets before subtracting.\n\nFound by 0sec (https://0sec.ai) using automated source analysis; the\nmissing lower bound is evident from source. Compile-tested."
    }
  ],
  "lastModified": "2026-09-14T13:19:08.113",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}