Ubuntu 18.04 & 16.04: USN-4302-1 Moderate: Linux Kernel Issues

ubuntu

March 16, 2020

Several security issues were fixed in the Linux kernel.

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-gke-4.15: Linux kernel for Google Container Engine (GKE) systems

- linux-kvm: Linux kernel for cloud environments

- linux-raspi2: Linux kernel for Raspberry Pi 2

- linux-snapdragon: Linux kernel for Snapdragon processors- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems

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

- linux-hwe: Linux hardware enablement (HWE) kernel

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. (CVE-2020-2732)

Gregory Herrero discovered that the fix for CVE-2019-14615 to address the

Linux kernel not properly clearing data structure...

Read the Full Advisory

Topics Covered

security advisory denial of service kernel update memory management ubuntu security issues linux kernel

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1055-gke     4.15.0-1055.58
  linux-image-4.15.0-1056-kvm     4.15.0-1056.57
  linux-image-4.15.0-1057-raspi2  4.15.0-1057.61
  linux-image-4.15.0-1063-aws     4.15.0-1063.67
  linux-image-4.15.0-1074-snapdragon  4.15.0-1074.81
  linux-image-4.15.0-91-generic   4.15.0-91.92
  linux-image-4.15.0-91-generic-lpae  4.15.0-91.92
  linux-image-4.15.0-91-lowlatency  4.15.0-91.92
  linux-image-aws                 4.15.0.1063.64
  linux-image-aws-lts-18.04       4.15.0.1063.64
  linux-image-generic             4.15.0.91.83
  linux-image-generic-lpae        4.15.0.91.83
  linux-image-gke                 4.15.0.1055.59
  linux-image-gke-4.15            4.15.0.1055.59
  linux-image-kvm                 4.15.0.1056.56
  linux-image-lowlatency          4.15.0.91.83
  linux-image-powerpc-e500mc      4.15.0.91.83
  linux-image-powerpc-smp         4.15.0.91.83
  linux-image-powerpc64-emb       4.15.0.91.83
  linux-image-powerpc64-smp       4.15.0.91.83
  linux-image-raspi2              4.15.0.1057.55
  linux-image-snapdragon          4.15.0.1074.77
  linux-image-virtual             4.15.0.91.83

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1058-gcp     4.15.0-1058.62
  linux-image-4.15.0-1063-aws     4.15.0-1063.67~16.04.1
  linux-image-4.15.0-91-generic   4.15.0-91.92~16.04.1
  linux-image-4.15.0-91-generic-lpae  4.15.0-91.92~16.04.1
  linux-image-4.15.0-91-lowlatency  4.15.0-91.92~16.04.1
  linux-image-aws-hwe             4.15.0.1063.63
  linux-image-gcp                 4.15.0.1058.72
  linux-image-generic-hwe-16.04   4.15.0.91.101
  linux-image-generic-lpae-hwe-16.04  4.15.0.91.101
  linux-image-gke                 4.15.0.1058.72
  linux-image-lowlatency-hwe-16.04  4.15.0.91.101
  linux-image-oem                 4.15.0.91.101
  linux-image-virtual-hwe-16.04   4.15.0.91.101

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.