CWE
416 362
Advisory Published

USN-5082-1: Linux kernel (OEM) vulnerabilities

First published: Thu Sep 16 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) Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code. (CVE-2021-3609)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-oem-20.04c<5.13.0.1012.16
5.13.0.1012.16
=20.04
All of
ubuntu/linux-image-5.13.0-1012-oem<5.13.0-1012.16
5.13.0-1012.16
=20.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-5082-1?

    The severity of USN-5082-1 is high.

  • What is the description of USN-5082-1?

    USN-5082-1 describes a vulnerability in the Linux kernel that allows an attacker to read or write portions of the host's physical memory.

  • How can an attacker exploit USN-5082-1?

    An attacker can exploit USN-5082-1 by running a malicious guest VM and using it to disable restrictions on VMLOAD/VMSAVE in a nested guest.

  • What software is affected by USN-5082-1?

    The affected software includes the Linux kernel images linux-image-oem-20.04c and linux-image-5.13.0-1012-oem on Ubuntu 20.04.

  • How do I fix USN-5082-1?

    To fix USN-5082-1, update the affected software to version 5.13.0.1012.16 or later.

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