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CVE-2018-7540

Estado: ModificadaMedia (6.5)—
Gravedad6.5Media · CVSS 3.0
Probabilidad de explotación0.43 %mayor que el 36 % de las CVE
Explotación activaNono figura en el catálogo de CISA
Exploit públicoNo conocidosin código público localizado

Se ha descubierto un problema en Xen hasta las versiones 4.10.x que permite que usuarios invitados del sistema operativo x86 PV provoquen una denegación de servicio (bloqueo de la CPU del sistema operativo del host) mediante la liberación de una página de tabla L3/L4 de tipo non-preemptable.

CVSS

Puntuación base
6.5
Versión
3.0
Vector
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días
0.43 %
Percentil entre todas las CVEs puntuadas
36
Fecha de la puntuación
20/10/2026

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 (2)

Debian — Debian LinuxXEN — XEN

CWE

Referencias

Mostrar las 18 referencias

JSON original (NVD)

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{
  "id": "CVE-2018-7540",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.9,
          "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"
        },
        "acInsufInfo": false,
        "impactScore": 6.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
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          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 4,
        "exploitabilityScore": 2
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2018-02-27T19:29:00.607",
  "references": [
    {
      "url": "http://www.securityfocus.com/bid/103174",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securitytracker.com/id/1040773",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2018/03/msg00003.html",
      "tags": [
        "Third Party Advisory"
      ],
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    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://security.gentoo.org/glsa/201810-06",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://support.citrix.com/article/CTX232096",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://support.citrix.com/article/CTX232655",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://www.debian.org/security/2018/dsa-4131",
      "tags": [
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      "source": "cve@mitre.org"
    },
    {
      "url": "https://xenbits.xen.org/xsa/advisory-252.html",
      "tags": [
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      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securityfocus.com/bid/103174",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2018/03/msg00003.html",
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    },
    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://support.citrix.com/article/CTX232096",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://support.citrix.com/article/CTX232655",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
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    },
    {
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      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in Xen through 4.10.x allowing x86 PV guest OS users to cause a denial of service (host OS CPU hang) via non-preemptable L3/L4 pagetable freeing."
    },
    {
      "lang": "es",
      "value": "Se ha descubierto un problema en Xen hasta las versiones 4.10.x que permite que usuarios invitados del sistema operativo x86 PV provoquen una denegación de servicio (bloqueo de la CPU del sistema operativo del host) mediante la liberación de una página de tabla L3/L4 de tipo non-preemptable."
    }
  ],
  "lastModified": "2026-06-17T02:03:20.120",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CCDFE96D-9999-441D-ACD6-74C3A2FDD8EF",
              "versionEndIncluding": "4.10.0"
            }
          ],
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
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          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}