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CVSS: 7.0EPSS: 0%CPEs: 3EXPL: 0

An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service or gain privileges by leveraging a race condition that arose when XENMEM_exchange was introduced. Se detectó un problema en Xen versiones hasta 4.11.x, permitiendo a usuarios del sistema operativo invitado PV de x86, causar una denegación de servicio u alcanzar privilegios mediante el aprovechamiento de una condición de carrera que surgió cuando se introdujo XENMEM_exchange. • http://www.openwall.com/lists/oss-security/2019/10/25/2 http://xenbits.xen.org/xsa/advisory-287.html https://seclists.org/bugtraq/2020/Jan/21 https://www.debian.org/security/2020/dsa-4602 https://xenbits.xen.org/xsa/advisory-287.html • CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') •

CVSS: 6.8EPSS: 0%CPEs: 3EXPL: 0

An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service or gain privileges by leveraging incorrect use of the HVM physmap concept for PV domains. Se detectó un problema en Xen versiones hasta 4.11.x, permitiendo a usuarios del sistema operativo invitado PV de x86, causar una denegación de servicio u alcanzar privilegios mediante el aprovechamiento del uso incorrecto del concepto physmap de HVM para dominios PV. • http://www.openwall.com/lists/oss-security/2019/10/25/10 http://xenbits.xen.org/xsa/advisory-288.html https://seclists.org/bugtraq/2020/Jan/21 https://www.debian.org/security/2020/dsa-4602 https://xenbits.xen.org/xsa/advisory-288.html • CWE-667: Improper Locking •

CVSS: 6.5EPSS: 0%CPEs: 3EXPL: 0

An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service by leveraging a long-running operation that exists to support restartability of PTE updates. Se detectó un problema en Xen versiones hasta 4.11.x, permitiendo a usuarios del sistema operativo invitado PV de x86, causar una denegación de servicio mediante el aprovechamiento de una operación de larga ejecución que se presenta para soportar la reiniciabilidad de las actualizaciones PTE. • http://www.openwall.com/lists/oss-security/2019/10/25/3 http://xenbits.xen.org/xsa/advisory-290.html https://seclists.org/bugtraq/2020/Jan/21 https://www.debian.org/security/2020/dsa-4602 https://xenbits.xen.org/xsa/advisory-290.html • CWE-662: Improper Synchronization •

CVSS: 8.8EPSS: 0%CPEs: 3EXPL: 0

An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service or gain privileges because of an incompatibility between Process Context Identifiers (PCID) and TLB flushes. Se detectó un problema en Xen versiones hasta 4.11.x, permitiendo a usuarios del sistema operativo invitado PV de x86, causar una denegación de servicio u alcanzar privilegios debido a una incompatibilidad entre los Identificadores de Contexto del Proceso (PCID) y las descargas de TLB. • http://www.openwall.com/lists/oss-security/2019/10/25/5 http://xenbits.xen.org/xsa/advisory-292.html https://seclists.org/bugtraq/2020/Jan/21 https://www.debian.org/security/2020/dsa-4602 https://xenbits.xen.org/xsa/advisory-292.html • CWE-20: Improper Input Validation •

CVSS: 7.8EPSS: 0%CPEs: 3EXPL: 0

An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service or gain privileges because a guest can manipulate its virtualised %cr4 in a way that is incompatible with Linux (and possibly other guest kernels). Se detectó un problema en Xen versiones hasta 4.11.x, permitiendo a usuarios del sistema operativo invitado PV de x86, causar una denegación de servicio u alcanzar privilegios porque un invitado puede manipular su %cr4 virtualizado en una manera que es incompatible con Linux (y posiblemente otros kernels invitados). • http://www.openwall.com/lists/oss-security/2019/10/25/8 http://xenbits.xen.org/xsa/advisory-293.html https://seclists.org/bugtraq/2020/Jan/21 https://www.debian.org/security/2020/dsa-4602 https://xenbits.xen.org/xsa/advisory-293.html • CWE-20: Improper Input Validation •