Security update for xen

SUSE Security Update: Security update for xen
Announcement ID: SUSE-SU-2019:1248-1
Rating: important
References: #1027519 #1079730 #1098403 #1111025 #1111331 #1120067 #1120095
Cross-References: CVE-2018-12126 CVE-2018-12127 CVE-2018-12130 CVE-2019-11091
Affected Products:
  • SUSE Linux Enterprise Module for Server Applications 15
  • SUSE Linux Enterprise Module for Basesystem 15

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)

Patch Instructions:

To install this SUSE 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:

  • SUSE Linux Enterprise Module for Server Applications 15:
    zypper in -t patch SUSE-SLE-Module-Server-Applications-15-2019-1248=1
  • SUSE Linux Enterprise Module for Basesystem 15:
    zypper in -t patch SUSE-SLE-Module-Basesystem-15-2019-1248=1

Package List:

  • SUSE Linux Enterprise Module for Server Applications 15 (x86_64):
    • xen-4.10.3_04-3.19.1
    • xen-debugsource-4.10.3_04-3.19.1
    • xen-devel-4.10.3_04-3.19.1
    • xen-tools-4.10.3_04-3.19.1
    • xen-tools-debuginfo-4.10.3_04-3.19.1
  • SUSE Linux Enterprise Module for Basesystem 15 (x86_64):
    • xen-debugsource-4.10.3_04-3.19.1
    • xen-libs-4.10.3_04-3.19.1
    • xen-libs-debuginfo-4.10.3_04-3.19.1
    • xen-tools-domU-4.10.3_04-3.19.1
    • xen-tools-domU-debuginfo-4.10.3_04-3.19.1

References: