Advisory Published

USN-5072-1: Linux kernel vulnerabilities

First published: Wed Sep 08 2021(Updated: )

Maxim Levitsky and Paolo Bonzini discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel allowed a guest VM to disable restrictions on VMLOAD/VMSAVE in a nested guest. An attacker in a guest VM could use this to read or write portions of the host's physical memory. (CVE-2021-3656) Maxim Levitsky discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel did not properly prevent a guest VM from enabling AVIC in nested guest VMs. An attacker in a guest VM could use this to write to portions of the host's physical memory. (CVE-2021-3653)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-oem-20.04b<5.10.0.1045.47
5.10.0.1045.47
=20.04
All of
ubuntu/linux-image-5.10.0-1045-oem<5.10.0-1045.47
5.10.0-1045.47
=20.04
All of
ubuntu/linux-image-oem-20.04<5.10.0.1045.47
5.10.0.1045.47
=20.04
All of
ubuntu/linux-image-5.8.0-1041-azure<5.8.0-1041.44~20.04.1
5.8.0-1041.44~20.04.1
=20.04
All of
ubuntu/linux-image-azure<5.8.0.1041.44~20.04.13
5.8.0.1041.44~20.04.13
=20.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this security notice?

    The vulnerability ID for this security notice is USN-5072-1.

  • What is the title of this security notice?

    The title of this security notice is USN-5072-1: Linux kernel vulnerabilities.

  • Who discovered the vulnerabilities mentioned in this security notice?

    The vulnerabilities mentioned in this security notice were discovered by Maxim Levitsky and Paolo Bonzini.

  • What can an attacker do with this vulnerability?

    An attacker in a guest VM could use this vulnerability to read or write portions of the host's physical memory.

  • How can I fix this vulnerability?

    To fix this vulnerability, update the affected software to version 5.10.0.1045.47 or later.

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