Ubuntu Security Update USN-3531-3: intel-microcode update

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intel-microcode update


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

  • Ubuntu 17.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS
Summary


The system could be made to expose sensitive information.

Software Description

  • intel-microcode - Processor microcode for Intel CPUs
Details


Jann Horn 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 corrected 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 - 3.20180312.0~ubuntu17.10.1
Ubuntu 16.04 LTS
intel-microcode - 3.20180312.0~ubuntu16.04.1
Ubuntu 14.04 LTS
intel-microcode - 3.20180312.0~ubuntu14.04.1

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References


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