USN-3531-2: Intel Microcode regression

22 January 2018

intel-microcode regression

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

  • Ubuntu 17.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


USN-3531-1 introduced regressions in intel-microcode.

Software Description

  • intel-microcode - Processor microcode for Intel CPUs


USN-3531-1 updated Intel microcode to the 20180108 release. Regressions were discovered in the microcode updates which could cause system instability on certain hardware platforms. At the request of Intel, we have reverted to the previous packaged microcode version, the 20170707 release.

Original advisory details:

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 versions:

Ubuntu 17.10
intel-microcode - 3.20180108.0+really20170707ubuntu17.10.1
Ubuntu 16.04 LTS
intel-microcode - 3.20180108.0+really20170707ubuntu16.04.1
Ubuntu 14.04 LTS
intel-microcode - 3.20180108.0+really20170707ubuntu14.04.1

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.