SUSE-SU-2018:1479-1: important: Security update for kvm

[sle-security-updates at lists.suse.com]

   SUSE Security Update: Security update for kvm
______________________________________________________________________________

Announcement ID:    SUSE-SU-2018:1479-1
Rating:             important
References:         #1092885 
Cross-References:   CVE-2018-3639
Affected Products:
                    SUSE Linux Enterprise Server 11-SP4
______________________________________________________________________________

   An update that fixes one vulnerability is now available.

Description:

   This update for kvm fixes one security issues.

   This security issue was fixed:

   - CVE-2018-3639: Spectre v4 vulnerability mitigation support for KVM
     guests (bsc#1092885).

     Systems with microprocessors utilizing speculative execution and
   speculative execution of memory reads before the addresses of all prior
   memory writes are known may allow unauthorized disclosure of information
   to an attacker with local user access via a side-channel analysis.

     This patch permits the new x86 cpu feature flag named "ssbd" to be
   presented to the guest, given that the host has this feature, and KVM
   exposes it to the guest as well.

     For this feature to be enabled please use the qemu commandline
     -cpu $MODEL,+spec-ctrl,+ssbd so the guest OS can take advantage of the
      feature.

     spec-ctrl and ssbd support is also required in the host.


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 Server 11-SP4:

      zypper in -t patch slessp4-kvm-13634=1



Package List:

   - SUSE Linux Enterprise Server 11-SP4 (i586 s390x x86_64):

      kvm-1.4.2-60.12.1


References:

   https://www.suse.com/security/cve/CVE-2018-3639.html
   https://bugzilla.suse.com/1092885