USN-3531-1: Intel Microcode update

Ubuntu Security Notice USN-3531-1

11th January, 2018

intel-microcode update

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

  • Ubuntu 17.10
  • Ubuntu 17.04
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


The system could be made to expose sensitive information.

Software description

  • intel-microcode - Processor microcode for Intel CPUs


It was discovered that microprocessors utilizing speculative execution
and branch prediction may allow unauthorized memory reads via sidechannel
attacks. This flaw is known as Spectre. A local attacker could use this to
expose sensitive information, including kernel memory. (CVE-2017-5715)

This update provides the microcode updates required for the corresponding
Linux kernel updates.

Update instructions

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

Ubuntu 17.10:
intel-microcode 3.20180108.0~ubuntu17.10.1
Ubuntu 17.04:
intel-microcode 3.20180108.0~ubuntu17.04.1
Ubuntu 16.04 LTS:
intel-microcode 3.20180108.0~ubuntu16.04.2
Ubuntu 14.04 LTS:
intel-microcode 3.20180108.0~ubuntu14.04.2

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.