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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 •

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 because of an incompatibility between Process Context Identifiers (PCID) and shadow-pagetable switching. 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 debido a una incompatibilidad entre los Identificadores de Contexto del Proceso (PCID) y la conmutación shadow-pagetable. • http://www.openwall.com/lists/oss-security/2019/10/25/7 http://xenbits.xen.org/xsa/advisory-294.html https://seclists.org/bugtraq/2020/Jan/21 https://www.debian.org/security/2020/dsa-4602 https://xenbits.xen.org/xsa/advisory-294.html • CWE-20: Improper Input Validation •

CVSS: 5.5EPSS: 0%CPEs: 3EXPL: 0

An issue was discovered in Xen through 4.12.x allowing Arm domU attackers to cause a denial of service (infinite loop) involving a LoadExcl or StoreExcl operation. Se detectó un problema en Xen versiones hasta 4.12.x, permitiendo a atacantes Arm domU causar una denegación de servicio (bucle infinito) involucrando una operación LoadExcl o StoreExcl. • http://xenbits.xen.org/xsa/advisory-295.html https://seclists.org/bugtraq/2020/Jan/21 https://www.debian.org/security/2020/dsa-4602 https://xenbits.xen.org/xsa/advisory-295.html • CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop') •

CVSS: 5.5EPSS: 0%CPEs: 3EXPL: 0

An issue was discovered in Xen through 4.12.x allowing Arm domU attackers to cause a denial of service (infinite loop) involving a compare-and-exchange operation. Se detectó un problema en Xen versiones hasta 4.12.x, permitiendo a atacantes Arm domU causar una denegación de servicio (bucle infinito) involucrando una operación de comparar e intercambiar. • http://xenbits.xen.org/xsa/advisory-295.html https://seclists.org/bugtraq/2020/Jan/21 https://www.debian.org/security/2020/dsa-4602 https://xenbits.xen.org/xsa/advisory-295.html • CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop') •