=========================================================================Ubuntu Security Notice USN-3909-1
March 14, 2019

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

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

libvirt could be made to crash under certain conditions.

Software Description:
- libvirt: Libvirt virtualization toolkit

Details:

It was discovered that libvirt incorrectly handled waiting for certain
agent events. An attacker inside a guest could possibly use this issue to
cause libvirtd to stop responding, resulting in a denial of service.

Update instructions:

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

Ubuntu 18.10:
  libvirt-clients                 4.6.0-2ubuntu3.4
  libvirt-daemon                  4.6.0-2ubuntu3.4
  libvirt0                        4.6.0-2ubuntu3.4

Ubuntu 18.04 LTS:
  libvirt-clients                 4.0.0-1ubuntu8.8
  libvirt-daemon                  4.0.0-1ubuntu8.8
  libvirt0                        4.0.0-1ubuntu8.8

Ubuntu 16.04 LTS:
  libvirt-bin                     1.3.1-1ubuntu10.25
  libvirt0                        1.3.1-1ubuntu10.25

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

References:
  https://ubuntu.com/security/notices/USN-3909-1
  CVE-2019-3840

Package Information:
  https://launchpad.net/ubuntu/+source/libvirt/4.6.0-2ubuntu3.4
  https://launchpad.net/ubuntu/+source/libvirt/4.0.0-1ubuntu8.8
  https://launchpad.net/ubuntu/+source/libvirt/1.3.1-1ubuntu10.25