This update for xen fixes the following issues:

- CVE-2018-12207: Untrusted virtual machines on Intel CPUs could exploit a race
condition in the Instruction Fetch Unit of the Intel CPU to cause a Machine
Exception during Page Size Change, causing the CPU core to be non-functional.
(bsc#1155945)
- CVE-2019-11135: Aborting an asynchronous TSX operation on Intel CPUs with
Transactional Memory support could be used to facilitate sidechannel
information leaks out of microarchitectural buffers, similar to the
previously described "Microarchitectural Data Sampling" attack. (bsc#1152497).
- CVE-2019-18425: 32-bit PV guest user mode could elevate its privileges to that
of the guest kernel. (bsc#1154456).
- CVE-2019-18421: A malicious PV guest administrator may have been able to
escalate their privilege to that of the host. (bsc#1154458).
- CVE-2019-18420: Malicious x86 PV guests may have caused a hypervisor crash,
resulting in a Denial of Service (Dos). (bsc#1154448)

This update was imported from the SUSE:SLE-15:Update update project.