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CVE-2020-15563

Estado: ModificadaMedia (6.5)—

An issue was discovered in Xen through 4.13.x, allowing x86 HVM guest OS users to cause a hypervisor crash. An inverted conditional in x86 HVM guests' dirty video RAM tracking code allows such guests to make Xen de-reference a pointer guaranteed to point at unmapped space. A malicious or buggy HVM guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Xen versions from 4.8 onwards are affected. Xen versions 4.7 and earlier are not affected. Only x86 systems are affected. Arm systems are not affected.

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Only x86 HVM guests using shadow paging can leverage the vulnerability. In addition, there needs to be an entity actively monitoring a guest's video frame buffer (typically for display purposes) in order for such a guest to be able to leverage the vulnerability. x86 PV guests, as well as x86 HVM guests using hardware assisted paging (HAP), cannot leverage the vulnerability.

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 (4)

Debian — Debian LinuxFedoraproject — FedoraOpensuse — LeapXEN — XEN

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2020-15563",
  "cveTags": [],
  "metrics": {
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          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:M/Au:N/C:N/I:N/A:C",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
        "impactScore": 6.9,
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        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.4,
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          "attackComplexity": "LOW",
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  "published": "2020-07-07T13:15:09.963",
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      "value": "An issue was discovered in Xen through 4.13.x, allowing x86 HVM guest OS users to cause a hypervisor crash. An inverted conditional in x86 HVM guests' dirty video RAM tracking code allows such guests to make Xen de-reference a pointer guaranteed to point at unmapped space. A malicious or buggy HVM guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Xen versions from 4.8 onwards are affected. Xen versions 4.7 and earlier are not affected. Only x86 systems are affected. Arm systems are not affected. Only x86 HVM guests using shadow paging can leverage the vulnerability. In addition, there needs to be an entity actively monitoring a guest's video frame buffer (typically for display purposes) in order for such a guest to be able to leverage the vulnerability. x86 PV guests, as well as x86 HVM guests using hardware assisted paging (HAP), cannot leverage the vulnerability."
    },
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      "lang": "es",
      "value": "Se detectó un problema en Xen versiones hasta 4.13.x, que permitía a usuarios del Sistema Operativo invitado x86 HVM causar un bloqueo del hipervisor. Un condicional invertido en el código de seguimiento de RAM de video sucio de los invitados x86 HVM permite a dichos invitados hacer que Xen desreferencie un puntero garantizado para apuntar a un espacio no asignado. Un invitado de HVM malicioso o con errores puede hacer que el hipervisor se bloquee, resultando en una Denegación de Servicio (DoS) que afecta a todo el host. Xen versiones desde 4.8 en adelante están afectadas. Xen versiones desde 4.7 y anteriores no están afectadas. Solo los sistemas x86 están afectados. Los sistemas de Arm no están afectados. Solo los invitados x86 HVM que usan paginación shadow pueden aprovechar la vulnerabilidad. Además, debe existir una entidad que supervise activamente el búfer de tramas de video de un invitado (generalmente para fines de visualización) para que dicho invitado pueda aprovechar la vulnerabilidad. Los invitados x86 PV, así como los invitados x86 HVM que usan paginación asistida por hardware (HAP), no pueden aprovechar la vulnerabilidad"
    }
  ],
  "lastModified": "2026-06-17T02:56:49.357",
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