This update for xen fixes the following issues: - CVE-2020-25604: Fixed a race condition when migrating timers between x86 HVM vCPU-s - CVE-2020-25595: Fixed an issue where PCI passthrough code was reading back hardware registers - CVE-2020-25597: Fixed an issue where a valid event channels may not turn invalid - CVE-2020-25596: Fixed a potential denial of service in x86 pv guest kernel via SYSENTER - CVE-2020-25603: Fixed an issue due to missing barriers when accessing/allocating an event channel - CVE-2020-25600: Fixed out of bounds event channels available to 32-bit x86 domains - CVE-2020-25599: Fixed race conditions with evtchn_reset - CVE-2020-25601: Fixed an issue due to lack of preemption in evtchn_reset / evtchn_destroy - CVE-2020-14364: Fixed an out-of-bounds read/write access while processing usb packets . - CVE-2020-0543: Fixed a leak of Special Register Buffer Data Sampling aka quot;CrossTalkquot; - CVE-2020-15565: Fixed an issue cache write . - CVE-2020-15567: Fixed an issue with non-atomic modification of live EPT PTE