Advisory Published

USN-3977-3: Intel Microcode update

First published: Thu Jun 20 2019(Updated: )

USN-3977-1 and USN-3977-2 provided mitigations for Microarchitectural Data Sampling (MDS) vulnerabilities in Intel Microcode for a large number of Intel processor families. This update provides the corresponding updated microcode mitigations for the Intel Sandy Bridge processor family Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Giorgi Maisuradze, Dan Horea Lutas, Andrei Lutas, Volodymyr Pikhur, Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, Cristiano Giuffrida, Moritz Lipp, Michael Schwarz, and Daniel Gruss discovered that memory previously stored in microarchitectural fill buffers of an Intel CPU core may be exposed to a malicious process that is executing on the same CPU core. A local attacker could use this to expose sensitive information. (CVE-2018-12130) Brandon Falk, Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, and Cristiano Giuffrida discovered that memory previously stored in microarchitectural load ports of an Intel CPU core may be exposed to a malicious process that is executing on the same CPU core. A local attacker could use this to expose sensitive information. (CVE-2018-12127) Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Marina Minkin, Daniel Moghimi, Moritz Lipp, Michael Schwarz, Jo Van Bulck, Daniel Genkin, Daniel Gruss, Berk Sunar, Frank Piessens, and Yuval Yarom discovered that memory previously stored in microarchitectural store buffers of an Intel CPU core may be exposed to a malicious process that is executing on the same CPU core. A local attacker could use this to expose sensitive information. (CVE-2018-12126) Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Volodrmyr Pikhur, Moritz Lipp, Michael Schwarz, Daniel Gruss, Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, and Cristiano Giuffrida discovered that uncacheable memory previously stored in microarchitectural buffers of an Intel CPU core may be exposed to a malicious process that is executing on the same CPU core. A local attacker could use this to expose sensitive information. (CVE-2019-11091)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/intel-microcode<3.20190618.0ubuntu0.19.04.1
3.20190618.0ubuntu0.19.04.1
=19.04
All of
ubuntu/intel-microcode<3.20190618.0ubuntu0.18.10.1
3.20190618.0ubuntu0.18.10.1
=18.10
All of
ubuntu/intel-microcode<3.20190618.0ubuntu0.18.04.1
3.20190618.0ubuntu0.18.04.1
=18.04
All of
ubuntu/intel-microcode<3.20190618.0ubuntu0.16.04.1
3.20190618.0ubuntu0.16.04.1
=16.04
All of
ubuntu/intel-microcode<3.20190618.0ubuntu0.14.04.1
3.20190618.0ubuntu0.14.04.1
=14.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is USN-3977-3?

    USN-3977-3 is a security update that provides mitigations for Microarchitectural Data Sampling (MDS) vulnerabilities in Intel Microcode for the Intel Sandy Bridge processor family.

  • How do I fix USN-3977-3?

    To fix USN-3977-3, update the Intel Microcode package to version 3.20190618.0ubuntu0.19.04.1 on Ubuntu 19.04, version 3.20190618.0ubuntu0.18.10.1 on Ubuntu 18.10, version 3.20190618.0ubuntu0.18.04.1 on Ubuntu 18.04, version 3.20190618.0ubuntu0.16.04.1 on Ubuntu 16.04, or version 3.20190618.0ubuntu0.14.04.1 on Ubuntu 14.04.

  • What are the affected versions of Intel Microcode?

    The affected versions of Intel Microcode are 3.20190618.0ubuntu0.19.04.1 for Ubuntu 19.04, 3.20190618.0ubuntu0.18.10.1 for Ubuntu 18.10, 3.20190618.0ubuntu0.18.04.1 for Ubuntu 18.04, 3.20190618.0ubuntu0.16.04.1 for Ubuntu 16.04, and 3.20190618.0ubuntu0.14.04.1 for Ubuntu 14.04.

  • What are the vulnerabilities fixed by USN-3977-3?

    USN-3977-3 provides mitigations for the following vulnerabilities: CVE-2018-12126, CVE-2018-12127, and CVE-2018-12130.

  • Where can I find more information about USN-3977-3?

    You can find more information about USN-3977-3 on the Ubuntu Security website at: https://ubuntu.com/security/CVE-2018-12126, https://ubuntu.com/security/CVE-2018-12127, and https://ubuntu.com/security/CVE-2018-12130.

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