Advisory Published

USN-3977-2: Intel Microcode update

First published: Wed May 22 2019(Updated: )

USN-3977-1 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 Intel Cherry Trail and Bay Trail processor families. Original advisory details: 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<3.20190514.0ubuntu0.19.04.3
3.20190514.0ubuntu0.19.04.3
=19.04
All of
ubuntu/intel-microcode<3.20190514.0ubuntu0.18.10.2
3.20190514.0ubuntu0.18.10.2
=18.10
All of
ubuntu/intel-microcode<3.20190514.0ubuntu0.18.04.3
3.20190514.0ubuntu0.18.04.3
=18.04
All of
ubuntu/intel-microcode<3.20190514.0ubuntu0.16.04.2
3.20190514.0ubuntu0.16.04.2
=16.04
All of
ubuntu/intel-microcode<3.20190514.0ubuntu0.14.04.2
3.20190514.0ubuntu0.14.04.2
=14.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this update?

    The vulnerability ID for this update is USN-3977-2.

  • What is the purpose of this update?

    This update provides microcode mitigations for Intel Cherry Trail and Bay Trail processor families for Microarchitectural Data Sampling (MDS) vulnerabilities.

  • Which processor families are affected by the vulnerabilities?

    The Intel Cherry Trail and Bay Trail processor families are affected by the vulnerabilities.

  • What is the recommended version of the intel-microcode package to fix the vulnerability?

    The recommended version of the intel-microcode package to fix the vulnerability is 3.20190514.0ubuntu0.19.04.3 for Ubuntu 19.04, 3.20190514.0ubuntu0.18.10.2 for Ubuntu 18.10, 3.20190514.0ubuntu0.18.04.3 for Ubuntu 18.04, 3.20190514.0ubuntu0.16.04.2 for Ubuntu 16.04, and 3.20190514.0ubuntu0.14.04.2 for Ubuntu 14.04.

  • Where can I find more information about the vulnerabilities?

    You can find more information about the vulnerabilities on the Ubuntu Security Notices website: [CVE-2018-12126](https://ubuntu.com/security/CVE-2018-12126), [CVE-2018-12127](https://ubuntu.com/security/CVE-2018-12127), [CVE-2018-12130](https://ubuntu.com/security/CVE-2018-12130).

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