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CVE-2019-18422

Estado: ModificadaAlta (8.8)—

Se detectó un problema en Xen versiones hasta 4.12.x, permitiendo a usuarios del sistema operativo invitado ARM causar una denegación de servicio o alcanzar privilegios mediante el aprovechamiento de la habilitación errónea de interrupciones. Las interrupciones se desenmascaran incondicionalmente en los controladores de excepciones. Cuando se produce una excepción en un sistema ARM que es manejado sin cambiar el nivel del procesador, algunas interrupciones son habilitadas incondicionalmente durante la entrada de la excepción.

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Por lo tanto, las excepciones que se presentan cuando se enmascaran las interrupciones desenmascararán efectivamente las interrupciones. Un invitado malicioso podría lograr que el código Xen crítico sea ejecutado con interrupciones habilitadas erróneamente. Esto podría conllevar a una corrupción de datos, una denegación de servicio o, posiblemente, una escalada de privilegios. Sin embargo, no se ha identificado una técnica de ataque precisa.

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-2019-18422",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 8.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:S/C:C/I:C/A:C",
          "authentication": "SINGLE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
        },
        "acInsufInfo": false,
        "impactScore": 10,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 6.8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
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          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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  "affected": [
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      "affectedData": [
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          "versions": [
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  "published": "2019-10-31T14:15:10.790",
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  "vulnStatus": "Modified",
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-732"
        }
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  ],
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    {
      "lang": "en",
      "value": "An issue was discovered in Xen through 4.12.x allowing ARM guest OS users to cause a denial of service or gain privileges by leveraging the erroneous enabling of interrupts. Interrupts are unconditionally unmasked in exception handlers. When an exception occurs on an ARM system which is handled without changing processor level, some interrupts are unconditionally enabled during exception entry. So exceptions which occur when interrupts are masked will effectively unmask the interrupts. A malicious guest might contrive to arrange for critical Xen code to run with interrupts erroneously enabled. This could lead to data corruption, denial of service, or possibly even privilege escalation. However a precise attack technique has not been identified."
    },
    {
      "lang": "es",
      "value": "Se detectó un problema en Xen versiones hasta 4.12.x, permitiendo a usuarios del sistema operativo invitado ARM causar una denegación de servicio o alcanzar privilegios mediante el aprovechamiento de la habilitación errónea de interrupciones. Las interrupciones se desenmascaran incondicionalmente en los controladores de excepciones. Cuando se produce una excepción en un sistema ARM que es manejado sin cambiar el nivel del procesador, algunas interrupciones son habilitadas incondicionalmente durante la entrada de la excepción. Por lo tanto, las excepciones que se presentan cuando se enmascaran las interrupciones desenmascararán efectivamente las interrupciones. Un invitado malicioso podría lograr que el código Xen crítico sea ejecutado con interrupciones habilitadas erróneamente. Esto podría conllevar a una corrupción de datos, una denegación de servicio o, posiblemente, una escalada de privilegios. Sin embargo, no se ha identificado una técnica de ataque precisa."
    }
  ],
  "lastModified": "2026-06-17T02:25:00.523",
  "configurations": [
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}