Security update for xen

Open Source Vulnerabilities SUSE-SU-2020:14444-1

This update for xen fixes the following issues: - bsc#1174543 - secure boot related fixes - bsc#1163019 - CVE-2020-8608: potential OOB access due to unsafe snprintf() usages - bsc#1169392 - CVE-2020-11742: Bad continuation handling in GNTTABOP_copy - bsc#1168140 - CVE-2020-11740, CVE-2020-11741: multiple xenoprof issues - bsc#1161181 - CVE-2020-7211: potential directory traversal using relative paths via tftp server on Windows host - bsc#1157888 - CVE-2019-19579: Device quarantine for alternate pci assignment methods - bsc#1158004 - CVE-2019-19583: VMX: VMentry failure with debug exceptions and blocked states - bsc#1158005 - CVE-2019-19578: Linear pagetable use / entry miscounts - bsc#1158006 - CVE-2019-19580: Further issues with restartable PV type change operations - bsc#1158007 - CVE-2019-19577: dynamic height for the IOMMU pagetables - bsc#1154448 - CVE-2019-18420: VCPUOP_initialise DoS - bsc#1154456 - CVE-2019-18425: missing descriptor table limit checking in x86 PV emulation - bsc#1154458 - CVE-2019-18421: Issues with restartable PV type change operations - bsc#1154461 - CVE-2019-18424: passed through PCI devices may corrupt host memory after deassignment - bsc#1155945 - CVE-2018-12207: Machine Check Error Avoidance on Page Size Change (aka IFU issue) - bsc#1152497 - CVE-2019-11135: TSX Asynchronous Abort (TAA) issue