Advisory Published

USN-5486-1: Intel Microcode vulnerabilities

First published: Mon Jun 20 2022(Updated: )

It was discovered that some Intel processors did not implement sufficient control flow management. A local attacker could use this to cause a denial of service. (CVE-2021-0127) Joseph Nuzman discovered that some Intel processors did not properly initialise shared resources. A local attacker could use this to obtain sensitive information. (CVE-2021-0145) Mark Ermolov, Dmitry Sklyarov and Maxim Goryachy discovered that some Intel processors did not prevent test and debug logic from being activated at runtime. A local attacker could use this to escalate privileges. (CVE-2021-0146) It was discovered that some Intel processors did not properly restrict access in some situations. A local attacker could use this to obtain sensitive information. (CVE-2021-33117) Brandon Miller discovered that some Intel processors did not properly restrict access in some situations. A local attacker could use this to obtain sensitive information or a remote attacker could use this to cause a denial of service. (CVE-2021-33120) It was discovered that some Intel processors did not completely perform cleanup actions on multi-core shared buffers. A local attacker could possibly use this to expose sensitive information. (CVE-2022-21123, CVE-2022-21127) Alysa Milburn, Jason Brandt, Avishai Redelman and Nir Lavi discovered that some Intel processors improperly optimised security-critical code. A local attacker could possibly use this to expose sensitive information. (CVE-2022-21151) It was discovered that some Intel processors did not properly perform cleanup during specific special register write operations. A local attacker could possibly use this to expose sensitive information. (CVE-2022-21166)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/intel-microcode<3.20220510.0ubuntu0.22.04.1
3.20220510.0ubuntu0.22.04.1
=22.04
All of
ubuntu/intel-microcode<3.20220510.0ubuntu0.21.10.1
3.20220510.0ubuntu0.21.10.1
=21.10
All of
ubuntu/intel-microcode<3.20220510.0ubuntu0.20.04.1
3.20220510.0ubuntu0.20.04.1
=20.04
All of
ubuntu/intel-microcode<3.20220510.0ubuntu0.18.04.1
3.20220510.0ubuntu0.18.04.1
=18.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID of this Intel Microcode vulnerability?

    The vulnerability ID of this Intel Microcode vulnerability is CVE-2021-0127.

  • How can a local attacker exploit this vulnerability?

    A local attacker can exploit this vulnerability to cause a denial of service.

  • Which processors are affected by this vulnerability?

    Some Intel processors are affected by this vulnerability.

  • What is the recommended remedy for this vulnerability on Ubuntu 22.04?

    The recommended remedy for this vulnerability on Ubuntu 22.04 is to update to version 3.20220510.0ubuntu0.22.04.1 of the intel-microcode package.

  • Where can I find more information about this vulnerability?

    You can find more information about this vulnerability on the Ubuntu Security Advisory page for CVE-2021-0127.

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