openSUSE Leap 42.3 Advisory: Important Xen Security Fix

This update for xen fixes the following security issues:

- CVE-2018-3646: Systems with microprocessors utilizing speculative

execution and address translations may have allowed unauthorized

disclosure of information residing in the L1 data cache to an attacker

with local user access with guest OS privilege via a terminal page fault

and a side-channel analysis (bsc#1091107, bsc#1027519).

- Incorrect MSR_DEBUGCTL handling let guests enable BTS allowing a

malicious or buggy guest administrator can lock up the entire host

(bsc#1103276)

This update was imported from the SUSE:SLE-12-SP3:Update update project.