USN-3680-1: libvirt vulnerability and update

12 June 2018

libvirt vulnerability and update

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 18.04 LTS
  • Ubuntu 17.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


Side channel execution mitigations were added to libvirt.

Software Description

  • libvirt - Libvirt virtualization toolkit


Ken Johnson and Jann Horn independently discovered that microprocessors utilizing speculative execution of a memory read may allow unauthorized memory reads via sidechannel attacks. An attacker in the guest could use this to expose sensitive guest information, including kernel memory. This update allows libvirt to expose new CPU features added by microcode updates to guests. (CVE-2018-3639)

Daniel P. Berrange discovered that libvirt incorrectly handled the QEMU guest agent. An attacker could possibly use this issue to consume resources, leading to a denial of service. (CVE-2018-1064)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.04 LTS
libvirt-bin - 4.0.0-1ubuntu8.2
libvirt0 - 4.0.0-1ubuntu8.2
Ubuntu 17.10
libvirt-bin - 3.6.0-1ubuntu6.8
libvirt0 - 3.6.0-1ubuntu6.8
Ubuntu 16.04 LTS
libvirt-bin - 1.3.1-1ubuntu10.24
libvirt0 - 1.3.1-1ubuntu10.24
Ubuntu 14.04 LTS
libvirt-bin - 1.2.2-0ubuntu13.1.27
libvirt0 - 1.2.2-0ubuntu13.1.27

To update your system, please follow these instructions:

After a standard system update you need to reboot your computer to make all the necessary changes.