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PV guests cannot leverage the vulnerability."}, {"lang": "es", "value": "Se detect\u00f3 un problema en Xen versiones hasta 4.12.x permitiendo a usuarios del Sistema Operativo invitado HVM/PVH en x86, causar una denegaci\u00f3n de servicio (bloqueo del Sistema Operativo invitado) porque las comprobaciones de VMX VMEntry manejan inapropiadamente un determinado caso. Consulte XSA-260 para antecedentes sobre el MovSS shadow. Consulte XSA-156 para obtener informaci\u00f3n sobre la necesidad de interceptar #DB. A las comprobaciones de VMX VMEntry no les gusta la combinaci\u00f3n exacta de estado que ocurre cuando #DB es interceptado, Single Stepping est\u00e1 activo y bloqueado por STI/MovSS est\u00e1 activo, a pesar de que este es un estado leg\u00edtimo. El fallo de VMEntry resultante es fatal para el invitado El c\u00f3digo de espacio de usuario invitado de HVM/PVH puede bloquear al invitado, resultando en una Denegaci\u00f3n de Servicio del invitado. Todas las versiones de Xen est\u00e1n afectadas. Solo est\u00e1n afectados los sistemas que admiten extensiones virtuales de hardware VMX (CPU Intel, Cyrix o Zhaoxin). Los sistemas de brazo y AMD no est\u00e1n afectados. Solo los invitados HVM/PVH est\u00e1n afectados. 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{"bugzilla": {"description": "xen: denial of service in HVM/PVH guest userspace code (XSA-308)", "id": "1778171", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1778171"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.2", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-400", "details": ["An issue was discovered in Xen through 4.12.x allowing x86 HVM/PVH guest OS users to cause a denial of service (guest OS crash) because VMX VMEntry checks mishandle a certain case. Please see XSA-260 for background on the MovSS shadow. Please see XSA-156 for background on the need for #DB interception. The VMX VMEntry checks do not like the exact combination of state which occurs when #DB in intercepted, Single Stepping is active, and blocked by STI/MovSS is active, despite this being a legitimate state to be in. The resulting VMEntry failure is fatal to the guest. HVM/PVH guest userspace code may be able to crash the guest, resulting in a guest Denial of Service. All versions of Xen are affected. Only systems supporting VMX hardware virtual extensions (Intel, Cyrix, or Zhaoxin CPUs) are affected. Arm and AMD systems are unaffected. Only HVM/PVH guests are affected. PV guests cannot leverage the vulnerability."], "name": "CVE-2019-19583", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "kernel-xen", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2019-12-11T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2019-19583\nhttps://nvd.nist.gov/vuln/detail/CVE-2019-19583"], "threat_severity": "Moderate"}