CVE-2026-83834

Estado: Pendiente de análisisAlta (7)—PoC

Gravedad7Alta · CVSS 3.1

Probabilidad de explotación0.21 %mayor que el 10 % de las CVE

Explotación activaNono figura en el catálogo de CISA

Exploit públicoDisponiblePrueba de concepto en GitHub (no verificada)

Uso de memoria después de liberarla (use after free) en los controladores en modo kernel de Windows permite a un atacante autorizado elevar privilegios de forma local.

Traducción automática del texto original de NVD (en inglés).

CVSS

Puntuación base: 7
Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.21 %
Percentil entre todas las CVEs puntuadas: 10
Fecha de la puntuación: 20/10/2026

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).

Exploits públicos

Hay código de explotación o plantillas de detección públicos. No es lo mismo que explotación activa confirmada (KEV), pero aumenta el riesgo: parchee con prioridad.

Prueba de concepto en GitHub (no verificada) · Lista de pruebas de concepto en GitHub

⚠️ Las pruebas de concepto de GitHub no están verificadas: algunas son falsas o contienen malware. No las ejecute nunca fuera de un laboratorio aislado.

Técnicas ATT&CK

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

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation90 %

El vector AV:L con UI:N y la descripción de escalada local de privilegios en drivers del kernel sustentan T1068; el texto no menciona ejecución de comandos, así que no se asigna T1059.

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 Program Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software

Tecnologías afectadas (1)

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

Microsoft — Windows^AI

CWE

CWE-367, CWE-416

Referencias

Mostrar las 1 referencias

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83834

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-83834",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-83834",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-10-13T20:26:01.046444Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "secure@microsoft.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1
      }
    ]
  },
  "affected": [
    {
      "source": "secure@microsoft.com",
      "affectedData": [
        {
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          ],
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        {
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        {
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          ],
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        {
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          ],
          "platforms": [
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        {
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          ],
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        {
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            }
          ],
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        {
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        {
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          ],
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        {
          "vendor": "Microsoft",
          "product": "Windows Server 2022",
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              "lessThan": "10.0.20348.5761",
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            }
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        {
          "vendor": "Microsoft",
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              "versionType": "custom"
            }
          ],
          "platforms": [
            "x64-based Systems"
          ]
        },
        {
          "vendor": "Microsoft",
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          "versions": [
            {
              "status": "affected",
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              "lessThan": "10.0.26100.33650",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "x64-based Systems"
          ]
        }
      ]
    }
  ],
  "published": "2026-10-13T19:20:31.227",
  "references": [
    {
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83834",
      "source": "secure@microsoft.com"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secure@microsoft.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-367"
        },
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to elevate privileges locally."
    }
  ],
  "lastModified": "2026-10-16T16:21:35.010",
  "sourceIdentifier": "secure@microsoft.com"
}