Explore top 10 tips to secure your open-source projects now. Read More

×
Alerts This Week
Warning Icon 1 428
Alerts This Week
Warning Icon 1 428

Ubuntu 18.04 LTS: USN-5073-2 Critical: KVM Memory Issues

ubuntu
Calendar Grey September 17, 2021
Dist Ubuntu Esm H88
Multiple security issues in Linux kernel for GCP were fixed. Update your systems now!
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

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. ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu linux kernel kvm gcp

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1108-gcp     4.15.0-1108.122
  linux-image-gcp-lts-18.04       4.15.0.1108.127

Ubuntu 16.04 ESM:
  linux-image-4.15.0-1108-gcp     4.15.0-1108.122~16.04.1
  linux-image-gcp                 4.15.0.1108.109
  linux-image-gke                 4.15.0.1108.109

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-5073-2

https://ubuntu.com/security/notices/USN-5073-1

CVE-2021-34693, CVE-2021-3612, CVE-2021-3653, CVE-2021-3656,

CVE-2021-38160

Severity
critical
Lowest
Low
Medium
High
Critical

September 17, 2021

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu linux kernel kvm gcp

Package Information

https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1108.122

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.