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CVE-2020-25599

Estado: ModificadaAlta (7)—

An issue was discovered in Xen through 4.14.x. There are evtchn_reset() race conditions. Uses of EVTCHNOP_reset (potentially by a guest on itself) or XEN_DOMCTL_soft_reset (by itself covered by XSA-77) can lead to the violation of various internal assumptions. This may lead to out of bounds memory accesses or triggering of bug checks. In particular, x86 PV guests may be able to elevate their privilege to that of the host. Host and guest crashes are also possible, leading to a Denial of Service (DoS). Information leaks cannot be ruled out. All Xen versions from 4.5 onwards are vulnerable. Xen versions 4.4 and earlier are not vulnerable.

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

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  "id": "CVE-2020-25599",
  "cveTags": [],
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          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:M/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
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        "acInsufInfo": false,
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        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.4,
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          "attackComplexity": "HIGH",
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  "published": "2020-09-23T22:15:13.477",
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      "description": [
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          "value": "CWE-119"
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          "value": "CWE-362"
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      "lang": "en",
      "value": "An issue was discovered in Xen through 4.14.x. There are evtchn_reset() race conditions. Uses of EVTCHNOP_reset (potentially by a guest on itself) or XEN_DOMCTL_soft_reset (by itself covered by XSA-77) can lead to the violation of various internal assumptions. This may lead to out of bounds memory accesses or triggering of bug checks. In particular, x86 PV guests may be able to elevate their privilege to that of the host. Host and guest crashes are also possible, leading to a Denial of Service (DoS). Information leaks cannot be ruled out. All Xen versions from 4.5 onwards are vulnerable. Xen versions 4.4 and earlier are not vulnerable."
    },
    {
      "lang": "es",
      "value": "Se detectó un problema en Xen versiones hasta 4.14.x. Se presentan condiciones de carrera de la función evtchn_reset(). Los usos de EVTCHNOP_reset (potencialmente por parte de un invitado en sí mismo) o XEN_DOMCTL_soft_reset (por sí mismo cubierto por XSA-77) pueden conducir a la violación de varias suposiciones internas. Esto puede conllevar a accesos a memoria fuera de los límites o a la activación de comprobaciones de errores. En particular, los invitados de PV x86 pueden elevar su privilegio al del anfitrión. También es posible que el host y el invitado se bloqueen, conllevando a una Denegación de Servicio (DoS). El filtrado de información no se puede descartar. Todas las versiones de Xen desde la 4.5 en adelante son vulnerables. Las versiones 4.4 y anteriores de Xen no son vulnerables."
    }
  ],
  "lastModified": "2026-06-17T03:06:57.280",
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