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CVE-2020-25604

Estado: ModificadaMedia (4.7)—

An issue was discovered in Xen through 4.14.x. There is a race condition when migrating timers between x86 HVM vCPUs. When migrating timers of x86 HVM guests between its vCPUs, the locking model used allows for a second vCPU of the same guest (also operating on the timers) to release a lock that it didn't acquire. The most likely effect of the issue is a hang or crash of the hypervisor, i.e., a Denial of Service (DoS). All versions of Xen are affected. Only x86 systems are vulnerable. Arm systems are not vulnerable. Only x86 HVM guests can leverage the vulnerability. x86 PV and PVH cannot leverage the vulnerability. Only guests with more than one vCPU can exploit 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-2020-25604",
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          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:M/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
        "impactScore": 2.9,
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        "obtainAllPrivilege": false,
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  "published": "2020-09-23T22:15:13.930",
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      "value": "An issue was discovered in Xen through 4.14.x. There is a race condition when migrating timers between x86 HVM vCPUs. When migrating timers of x86 HVM guests between its vCPUs, the locking model used allows for a second vCPU of the same guest (also operating on the timers) to release a lock that it didn't acquire. The most likely effect of the issue is a hang or crash of the hypervisor, i.e., a Denial of Service (DoS). All versions of Xen are affected. Only x86 systems are vulnerable. Arm systems are not vulnerable. Only x86 HVM guests can leverage the vulnerability. x86 PV and PVH cannot leverage the vulnerability. Only guests with more than one vCPU can exploit the vulnerability."
    },
    {
      "lang": "es",
      "value": "Se detectó un problema en Xen versiones hasta 4.14.x. Se presenta una condición de carrera cuando se migran temporizadores entre x86 HVM vCPUs. Al migrar temporizadores de invitados de x86 HVM  entre sus vCPU, el modelo de bloqueo utilizado permite que una segunda vCPU del mismo invitado (que también opera en los temporizadores) para liberar un bloqueo que no adquirió. El efecto más probable del problema es un bloqueo o bloqueo del hypervisor, es decir, una Denegación de Servicio (DoS). Todas las versiones de Xen están afectadas. Solo los sistemas x86 son vulnerables. Los sistemas Arm no son vulnerables. Solo los invitados x86 HVM pueden aprovechar la vulnerabilidad. x86 PV y PVH no pueden aprovechar la vulnerabilidad. Solo los invitados con más de una vCPU pueden explotar la vulnerabilidad"
    }
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  "lastModified": "2026-06-17T03:06:58.053",
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