CWE
416
Advisory Published

USN-5071-2: Linux kernel (HWE) vulnerabilities

First published: Thu Sep 16 2021(Updated: )

USN-5071-1 fixed vulnerabilities in the Linux kernel for Ubuntu 20.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 20.04 LTS for Ubuntu 18.04 LTS. 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) It was discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel did not ensure enough processing time was given to perform cleanups of large SEV VMs. A local attacker could use this to cause a denial of service (soft lockup). (CVE-2020-36311) It was discovered that the KVM hypervisor implementation in the Linux kernel did not properly perform reference counting in some situations, leading to a use-after-free vulnerability. An attacker who could start and control a VM could possibly use this to expose sensitive information or execute arbitrary code. (CVE-2021-22543) Murray McAllister discovered that the joystick device interface in the Linux kernel did not properly validate data passed via an ioctl(). A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code on systems with a joystick device registered. (CVE-2021-3612)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-5.4.0-84-generic-lpae<5.4.0-84.94~18.04.1
5.4.0-84.94~18.04.1
=18.04
All of
ubuntu/linux-image-5.4.0-84-generic<5.4.0-84.94~18.04.1
5.4.0-84.94~18.04.1
=18.04
All of
ubuntu/linux-image-oem-osp1<5.4.0.84.94~18.04.75
5.4.0.84.94~18.04.75
=18.04
All of
ubuntu/linux-image-snapdragon-hwe-18.04<5.4.0.84.94~18.04.75
5.4.0.84.94~18.04.75
=18.04
All of
ubuntu/linux-image-generic-hwe-18.04<5.4.0.84.94~18.04.75
5.4.0.84.94~18.04.75
=18.04
All of
ubuntu/linux-image-lowlatency-hwe-18.04<5.4.0.84.94~18.04.75
5.4.0.84.94~18.04.75
=18.04
All of
ubuntu/linux-image-virtual-hwe-18.04<5.4.0.84.94~18.04.75
5.4.0.84.94~18.04.75
=18.04
All of
ubuntu/linux-image-oem<5.4.0.84.94~18.04.75
5.4.0.84.94~18.04.75
=18.04
All of
ubuntu/linux-image-5.4.0-84-lowlatency<5.4.0-84.94~18.04.1
5.4.0-84.94~18.04.1
=18.04
All of
ubuntu/linux-image-generic-lpae-hwe-18.04<5.4.0.84.94~18.04.75
5.4.0.84.94~18.04.75
=18.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-5071-2?

    The severity of USN-5071-2 is not specified.

  • How do I fix USN-5071-2?

    To fix USN-5071-2, update the Linux kernel to version 5.4.0-84.94~18.04.1 or later.

  • What software versions are affected by USN-5071-2?

    USN-5071-2 affects Ubuntu 18.04 LTS with Linux kernel versions 5.4.0-84-generic-lpae, 5.4.0-84-generic, 5.4.0.84.94~18.04.75, 5.4.0.84.94~18.04.75, 5.4.0.84.94~18.04.75, 5.4.0.84.94~18.04.75, 5.4.0.84.94~18.04.75, 5.4.0.84.94~18.04.75, 5.4.0.84.94~18.04.75, 5.4.0-84-lowlatency, and 5.4.0.84.94~18.04.75.

  • What vulnerabilities are fixed by USN-5071-2?

    USN-5071-2 fixes the vulnerabilities CVE-2021-3656, CVE-2021-3612, and CVE-2021-3653.

  • Where can I find more information about USN-5071-2?

    More information about USN-5071-2 can be found at the following references: [CVE-2021-3656](https://ubuntu.com/security/CVE-2021-3656), [CVE-2021-3612](https://ubuntu.com/security/CVE-2021-3612), [CVE-2021-3653](https://ubuntu.com/security/CVE-2021-3653).

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