Advisory Published

USN-3531-1: Intel Microcode update

First published: Thu Jan 11 2018(Updated: )

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.

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/intel-microcode<3.20180108.0~ubuntu17.10.1
3.20180108.0~ubuntu17.10.1
Ubuntu Ubuntu=17.10
All of
ubuntu/intel-microcode<3.20180108.0~ubuntu17.04.1
3.20180108.0~ubuntu17.04.1
Ubuntu Ubuntu=17.04
All of
ubuntu/intel-microcode<3.20180108.0~ubuntu16.04.2
3.20180108.0~ubuntu16.04.2
Ubuntu Ubuntu=16.04
All of
ubuntu/intel-microcode<3.20180108.0~ubuntu14.04.2
3.20180108.0~ubuntu14.04.2
Ubuntu Ubuntu=14.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is USN-3531-1?

    USN-3531-1 is a security notice issued by Ubuntu, addressing a vulnerability in the Intel Microcode.

  • What is the vulnerability addressed by USN-3531-1?

    USN-3531-1 addresses the Spectre vulnerability (CVE-2017-5715), which allows unauthorized memory reads via side-channel attacks.

  • How does the Spectre vulnerability (CVE-2017-5715) affect microprocessors?

    The Spectre vulnerability affects microprocessors utilizing speculative execution and branch prediction, allowing unauthorized memory reads.

  • What is the impact of the Spectre vulnerability (CVE-2017-5715)?

    The Spectre vulnerability can be exploited by a local attacker to expose sensitive information, including kernel memory.

  • How can I mitigate the Spectre vulnerability addressed in USN-3531-1?

    To mitigate the Spectre vulnerability, it is recommended to install the latest version (3.20180108.0~ubuntuXX.XX.X) of the intel-microcode package provided by Ubuntu.

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