openSUSE 42.3: 2018:0459-1 Critical: Xen DoS Attack Resolution

This update for xen fixes several issues.

These security issues were fixed:

- CVE-2017-5753, CVE-2017-5715, CVE-2017-5754: Prevent information leaks

via side effects of speculative execution, aka "Spectre" and "Meltdown"

attacks (bsc#1074562, bsc#1068032)

- CVE-2017-15595: x86 PV guest OS users were able to cause a DoS

(unbounded recursion, stack consumption, and hypervisor crash) or

possibly gain privileges via crafted page-table stacking (bsc#1061081)

- CVE-2017-17566: Prevent PV guest OS users to cause a denial of service

(host OS crash) or gain host OS privileges in shadow mode by mapping a

certain auxiliary page (bsc#1070158).

- CVE-2017-17563: Prevent guest OS users to cause a denial of service

(host OS crash) or gain host OS privileges by leveraging an incorrect

mask for reference-count overflow checking in shadow mode (bsc#1070159).

- CVE-2017-17564: Prevent guest OS users to cause a denial of service

(host...