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CVE-2020-29570

Estado: ModificadaMedia (6.2)—

Se detectó un problema en Xen versiones hasta 4.14.x. Se invierte la grabación de la asignación de bloques de control por vCPU mantenida por Xen y la de los punteros en el bloque de control. El consumidor asume, al visualizar el primero inicializado, que los segundos también están listos para su uso. Los kernels invitados maliciosos o con errores pueden montar un ataque de Denegación de Servicio (DoS) que afecte a todo el sistema

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).

Tecnologías afectadas (3)

Debian — Debian LinuxFedoraproject — FedoraXEN — XEN

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2020-29570",
  "cveTags": [],
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        "source": "nvd@nist.gov",
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          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:C",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
        "impactScore": 6.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
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        "impactScore": 3.6,
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  "affected": [
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      "affectedData": [
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  "published": "2020-12-15T17:15:14.753",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-770"
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  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in Xen through 4.14.x. Recording of the per-vCPU control block mapping maintained by Xen and that of pointers into the control block is reversed. The consumer assumes, seeing the former initialized, that the latter are also ready for use. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system."
    },
    {
      "lang": "es",
      "value": "Se detectó un problema en Xen versiones hasta 4.14.x. Se invierte la grabación de la asignación de bloques de control por vCPU mantenida por Xen y la de los punteros en el bloque de control. El consumidor asume, al visualizar el primero inicializado, que los segundos también están listos para su uso. Los kernels invitados maliciosos o con errores pueden montar un ataque de Denegación de Servicio (DoS) que afecte a todo el sistema"
    }
  ],
  "lastModified": "2026-06-17T03:11:27.150",
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