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CVE-2018-12893

Estado: ModificadaMedia (6.5)—

Se ha descubierto un problema en Xen hasta las versiones 4.10.x. Una de las correcciones en XSA-260 agregó algunas comprobaciones de seguridad para ayudar a evitar el livelocking de Xen con excepciones de depuración. Desafortunadamente, debido a un descuido, al menos uno de estos controles de seguridad puede ser activado por un invitado. Un invitado PV malicioso puede bloquear Xen, lo que conduce a una denegación de servicio (DoS). Todos los sistemas Xen que han aplicado la corrección XSA-260 son vulnerables. Sólo los sistemas x86 son vulnerables. Los sistemas ARM no son vulnerables.

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Sólo los invitados PV x86 pueden explotar la vulnerabilidad. Los invitados HVM y PVH x86 no pueden explotar la vulnerabilidad. Un atacante necesita ser capaz de controlar las instalaciones de depuración de hardware para explotar la vulnerabilidad, pero estos permisos suelen estar disponibles para usuarios no privilegiados.

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 (2)

Debian — Debian LinuxXEN — XEN

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2018-12893",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 2.1,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.0",
          "baseScore": 6.5,
          "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"
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  ],
  "published": "2018-07-02T17:29:00.583",
  "references": [
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      "tags": [
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        "VDB Entry"
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    },
    {
      "url": "http://www.securitytracker.com/id/1041202",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
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      "source": "cve@mitre.org"
    },
    {
      "url": "http://xenbits.xen.org/xsa/advisory-265.html",
      "tags": [
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        "Patch",
        "Vendor Advisory"
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    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1590979",
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    {
      "url": "https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html",
      "source": "cve@mitre.org"
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    {
      "url": "https://security.gentoo.org/glsa/201810-06",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://support.citrix.com/article/CTX235748",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://www.debian.org/security/2018/dsa-4236",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2018/06/27/11",
      "tags": [
        "Mailing List",
        "Mitigation",
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
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      "url": "http://www.securityfocus.com/bid/104572",
      "tags": [
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        "VDB Entry"
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    },
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        "Mitigation",
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    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://security.gentoo.org/glsa/201810-06",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://support.citrix.com/article/CTX235748",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.debian.org/security/2018/dsa-4236",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in Xen through 4.10.x. One of the fixes in XSA-260 added some safety checks to help prevent Xen livelocking with debug exceptions. Unfortunately, due to an oversight, at least one of these safety checks can be triggered by a guest. A malicious PV guest can crash Xen, leading to a Denial of Service. All Xen systems which have applied the XSA-260 fix are vulnerable. Only x86 systems are vulnerable. ARM systems are not vulnerable. Only x86 PV guests can exploit the vulnerability. x86 HVM and PVH guests cannot exploit the vulnerability. An attacker needs to be able to control hardware debugging facilities to exploit the vulnerability, but such permissions are typically available to unprivileged users."
    },
    {
      "lang": "es",
      "value": "Se ha descubierto un problema en Xen hasta las versiones 4.10.x. Una de las correcciones en XSA-260 agregó algunas comprobaciones de seguridad para ayudar a evitar el livelocking de Xen con excepciones de depuración. Desafortunadamente, debido a un descuido, al menos uno de estos controles de seguridad puede ser activado por un invitado. Un invitado PV malicioso puede bloquear Xen, lo que conduce a una denegación de servicio (DoS). Todos los sistemas Xen que han aplicado la corrección XSA-260 son vulnerables. Sólo los sistemas x86 son vulnerables. Los sistemas ARM no son vulnerables. Sólo los invitados PV x86 pueden explotar la vulnerabilidad. Los invitados HVM y PVH x86 no pueden explotar la vulnerabilidad. Un atacante necesita ser capaz de controlar las instalaciones de depuración de hardware para explotar la vulnerabilidad, pero estos permisos suelen estar disponibles para usuarios no privilegiados."
    }
  ],
  "lastModified": "2026-06-17T01:38:31.640",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:x86",
              "vulnerable": true,
              "matchCriteriaId": "C060EAC6-B637-4E6A-AA09-B868E50A6665",
              "versionEndIncluding": "4.10.0"
            }
          ],
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
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              "vulnerable": true,
              "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252"
            }
          ],
          "operator": "OR"
        }
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  ],
  "sourceIdentifier": "cve@mitre.org"
}