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Ubuntu Security Notice USN-5073-1

Ubuntu Security Notice USN-5073-1
Posted Sep 11, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5073-1 - 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. 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. Various other issues were also addressed.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2021-34693, CVE-2021-3612, CVE-2021-3653, CVE-2021-3656, CVE-2021-38160
SHA-256 | d47f70ebd1eef93cc6bda3c8c110382f63a6d1079b05d6e7253e584a3a764072

Ubuntu Security Notice USN-5073-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5073-1
September 09, 2021

linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15,
linux-dell300x, linux-hwe, linux-kvm, linux-oracle, linux-snapdragon
vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure-4.15: Linux kernel for Microsoft Azure Cloud systems
- linux-dell300x: Linux kernel for Dell 300x platforms
- linux-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

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 that the CAN broadcast manger (bcm) protocol
implementation in the Linux kernel did not properly initialize memory in
some situations. A local attacker could use this to expose sensitive
information (kernel memory). (CVE-2021-34693)

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)

It was discovered that the Virtio console implementation in the Linux
kernel did not properly validate input lengths in some situations. A local
attacker could possibly use this to cause a denial of service (system
crash). (CVE-2021-38160)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS:
linux-image-4.15.0-1027-dell300x 4.15.0-1027.32
linux-image-4.15.0-1080-oracle 4.15.0-1080.88
linux-image-4.15.0-1099-kvm 4.15.0-1099.101
linux-image-4.15.0-1111-aws 4.15.0-1111.118
linux-image-4.15.0-1112-snapdragon 4.15.0-1112.121
linux-image-4.15.0-1123-azure 4.15.0-1123.136
linux-image-4.15.0-156-generic 4.15.0-156.163
linux-image-4.15.0-156-generic-lpae 4.15.0-156.163
linux-image-4.15.0-156-lowlatency 4.15.0-156.163
linux-image-aws-lts-18.04 4.15.0.1111.114
linux-image-azure-lts-18.04 4.15.0.1123.96
linux-image-dell300x 4.15.0.1027.29
linux-image-generic 4.15.0.156.145
linux-image-generic-lpae 4.15.0.156.145
linux-image-kvm 4.15.0.1099.95
linux-image-lowlatency 4.15.0.156.145
linux-image-oracle-lts-18.04 4.15.0.1080.90
linux-image-snapdragon 4.15.0.1112.115
linux-image-virtual 4.15.0.156.145

Ubuntu 16.04 ESM:
linux-image-4.15.0-1080-oracle 4.15.0-1080.88~16.04.1
linux-image-4.15.0-1111-aws 4.15.0-1111.118~16.04.1
linux-image-4.15.0-1123-azure 4.15.0-1123.136~16.04.1
linux-image-4.15.0-156-generic 4.15.0-156.163~16.04.1
linux-image-4.15.0-156-lowlatency 4.15.0-156.163~16.04.1
linux-image-aws-hwe 4.15.0.1111.102
linux-image-azure 4.15.0.1123.114
linux-image-generic-hwe-16.04 4.15.0.156.149
linux-image-lowlatency-hwe-16.04 4.15.0.156.149
linux-image-oem 4.15.0.156.149
linux-image-oracle 4.15.0.1080.68
linux-image-virtual-hwe-16.04 4.15.0.156.149

Ubuntu 14.04 ESM:
linux-image-4.15.0-1123-azure 4.15.0-1123.136~14.04.1
linux-image-azure 4.15.0.1123.96

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References:
https://ubuntu.com/security/notices/USN-5073-1
CVE-2021-34693, CVE-2021-3612, CVE-2021-3653, CVE-2021-3656,
CVE-2021-38160

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-156.163
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1111.118
https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1123.136
https://launchpad.net/ubuntu/+source/linux-dell300x/4.15.0-1027.32
https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1099.101
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1080.88
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1112.121

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