Security update for xen (important)

An update that solves four vulnerabilities and has three
fixes is now available.

Description:

This update for xen fixes the following issues:

Four new speculative execution information leak issues have been
identified in Intel CPUs. (bsc#1111331)

• CVE-2018-12126: Microarchitectural Store Buffer Data Sampling (MSBDS)
• CVE-2018-12127: Microarchitectural Fill Buffer Data Sampling (MFBDS)
• CVE-2018-12130: Microarchitectural Load Port Data Samling (MLPDS)
• CVE-2019-11091: Microarchitectural Data Sampling Uncacheable Memory
  (MDSUM)

These updates contain the XEN Hypervisor adjustments, that additionaly
also use CPU Microcode updates.

The mitigation can be controlled via the “mds” commandline option, see the
documentation.

For more information on this set of vulnerabilities, check out
https://www.suse.com/support/kb/doc/?id=7023736

Other fixes:

• Added code to change LIBXL_HOTPLUG_TIMEOUT at runtime.

  The included README has details about the impact of this change
  (bsc#1120095)

• Fixes in Live migrating PV domUs

  An earlier change broke live migration of PV domUs without a device
  model. The migration would stall for 10 seconds while the domU was paused,
  which caused network connections to drop. Fix this by tracking the need
  for a device model within libxl. (bsc#1079730, bsc#1098403, bsc#1111025)

• Libvirt segfault when crash triggered on top of HVM guest (bsc#1120067)

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

Patch Instructions:

To install this openSUSE Security Update use the SUSE recommended installation methods
like YaST online_update or “zypper patch”.

Alternatively you can run the command listed for your product:

• openSUSE Leap 15.0:

  zypper in -t patch openSUSE-2019-1403=1