=========================================================================Ubuntu Security Notice USN-3891-1
February 18, 2019

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

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

systemd could be made to crash if it received specially a crafted
D-Bus message.

Software Description:
- systemd: system and service manager

Details:

It was discovered that systemd incorrectly handled certain D-Bus messages.
A local unprivileged attacker could exploit this in order to crash the
init process, resulting in a system denial-of-service (kernel panic).

Update instructions:

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

Ubuntu 18.10:
  libsystemd0                     239-7ubuntu10.8
  systemd                         239-7ubuntu10.8

Ubuntu 18.04 LTS:
  libsystemd0                     237-3ubuntu10.13
  systemd                         237-3ubuntu10.13

Ubuntu 16.04 LTS:
  libsystemd0                     229-4ubuntu21.16
  systemd                         229-4ubuntu21.16

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

References:
  
  CVE-2019-6454

Package Information:
  https://launchpad.net/ubuntu/+source/systemd/239-7ubuntu10.8
  https://launchpad.net/ubuntu/+source/systemd/237-3ubuntu10.13
  https://launchpad.net/ubuntu/+source/systemd/229-4ubuntu21.16