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USN-4303-1: Linux kernel vulnerability

17 March 2020

The system could be made to expose sensitive information.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Releases

Packages

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-kvm - Linux kernel for cloud environments

Details

Paulo Bonzini discovered that the KVM hypervisor implementation in the
Linux kernel could improperly let a nested (level 2) guest access the
resources of a parent (level 1) guest in certain situations. An attacker
could use this to expose sensitive information.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 16.04

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

Related notices

  • USN-4303-2: linux-image-powerpc64-emb-lts-xenial, linux-image-virtual-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-aws, linux-lts-xenial, linux-image-4.4.0-176-generic, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-176-powerpc-e500mc, linux-image-4.4.0-176-lowlatency, linux-image-4.4.0-176-powerpc-smp, linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-176-powerpc64-smp, linux-image-powerpc64-smp-lts-xenial, linux-image-aws, linux-image-generic-lts-xenial, linux-image-4.4.0-176-generic-lpae, linux-image-4.4.0-176-powerpc64-emb, linux-image-4.4.0-1064-aws
  • USN-4301-1: linux-image-oem-osp1, linux-image-5.0.0-1043-oem-osp1, linux-oem-osp1, linux-azure, linux-gcp, linux-image-azure, linux-image-5.0.0-1032-gke, linux-oracle-5.0, linux-image-aws-edge, linux-gke-5.0, linux-image-oracle, linux-image-5.0.0-1033-gcp, linux-image-5.0.0-1035-azure, linux-image-gke-5.0, linux-aws-5.0, linux-image-gcp, linux-image-5.0.0-1027-aws, linux-image-5.0.0-1013-oracle
  • USN-4300-1: linux-hwe, linux-kvm, linux-image-generic-hwe-18.04, linux-image-generic-lpae-hwe-18.04-edge, linux-image-gke-5.3, linux-image-5.3.0-1013-aws, linux-image-lowlatency, linux-image-5.3.0-1011-oracle, linux-image-virtual-hwe-18.04-edge, linux-aws, linux-image-5.3.0-1016-azure, linux-gcp-5.3, linux-azure-5.3, linux-image-gke, linux-image-gcp, linux-image-5.3.0-42-generic, linux-raspi2, linux-image-azure-edge, linux, linux-image-5.3.0-1014-gke, linux-image-lowlatency-hwe-18.04-edge, linux-image-snapdragon-hwe-18.04, linux-image-generic-hwe-18.04-edge, linux-image-kvm, linux-image-gcp-edge, linux-image-5.3.0-1012-kvm, linux-image-raspi2, linux-image-oracle, linux-image-snapdragon-hwe-18.04-edge, linux-gke-5.3, linux-image-5.3.0-1019-raspi2, linux-image-azure, linux-gcp, linux-image-5.3.0-42-generic-lpae, linux-image-generic, linux-image-5.3.0-42-snapdragon, linux-oracle, linux-image-virtual, linux-raspi2-5.3, linux-image-snapdragon, linux-image-raspi2-hwe-18.04, linux-image-5.3.0-42-lowlatency, linux-image-generic-lpae, linux-azure, linux-image-5.3.0-1014-gcp, linux-image-virtual-hwe-18.04, linux-image-generic-lpae-hwe-18.04, linux-image-lowlatency-hwe-18.04, linux-image-aws
  • USN-4302-1: linux-hwe, linux-image-generic-hwe-16.04, linux-image-generic-lpae-hwe-16.04, linux-kvm, linux-image-lowlatency, linux-image-lowlatency-hwe-16.04-edge, linux-image-gke-4.15, linux-aws, linux-image-4.15.0-1075-azure, linux-image-4.15.0-1074-snapdragon, linux-image-gke, linux-image-4.15.0-1063-aws, linux-image-4.15.0-91-lowlatency, linux-image-gcp, linux-image-oracle-lts-18.04, linux-image-generic-lpae-hwe-16.04-edge, linux-raspi2, linux-image-4.15.0-1055-gke, linux-image-4.15.0-1058-gcp, linux-image-azure-edge, linux, linux-image-4.15.0-1057-raspi2, linux-image-aws-lts-18.04, linux-image-lowlatency-hwe-16.04, linux-image-kvm, linux-snapdragon, linux-image-4.15.0-91-generic-lpae, linux-image-oracle, linux-image-raspi2, linux-image-generic-hwe-16.04-edge, linux-image-4.15.0-1056-kvm, linux-image-azure, linux-gcp, linux-oracle, linux-image-generic, linux-oem, linux-image-oem, linux-image-virtual-hwe-16.04-edge, linux-image-virtual, linux-image-snapdragon, linux-image-virtual-hwe-16.04, linux-image-generic-lpae, linux-azure, linux-aws-hwe, linux-image-4.15.0-1074-azure, linux-gke-4.15, linux-image-aws, linux-image-aws-hwe, linux-image-4.15.0-1076-oem, linux-image-4.15.0-91-generic, linux-image-4.15.0-1035-oracle