Security update for xen

Open Source Vulnerabilities SUSE-SU-2020:3945-1

This update for xen fixes the following issues: - CVE-2020-29480: Fixed an issue which could have allowed leak of non-sensitive data to administrator guests (bsc#117949 XSA-115). - CVE-2020-29481: Fixed an issue which could have allowd to new domains to inherit existing node permissions (bsc#1179498 XSA-322). - CVE-2020-29483: Fixed an issue where guests could disturb domain cleanup (bsc#1179502 XSA-325). - CVE-2020-29484: Fixed an issue where guests could crash xenstored via watchs (bsc#1179501 XSA-324). - CVE-2020-29566: Fixed an undue recursion in x86 HVM context switch code (bsc#1179506 XSA-348). - CVE-2020-29570: Fixed an issue where FIFO event channels control block related ordering (bsc#1179514 XSA-358). - CVE-2020-29571: Fixed an issue where FIFO event channels control structure ordering (bsc#1179516 XSA-359). - CVE-2020-29130: Fixed an out-of-bounds access while processing ARP packets (bsc#1179477). - Fixed an issue where dump-core shows missing nr_pages during core (bsc#1176782). - Multiple other bugs (bsc#1027519)