USN-4161-1: Linux kernel vulnerability

linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-raspi2 vulnerability

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

Ubuntu 19.10

Summary

The system could be made to crash under certain conditions.

Software Description

linux – Linux kernel
linux-aws – Linux kernel for Amazon Web Services (AWS) systems
linux-azure – Linux kernel for Microsoft Azure Cloud systems
linux-gcp – Linux kernel for Google Cloud Platform (GCP) systems
linux-kvm – Linux kernel for cloud environments
linux-raspi2 – Linux kernel for Raspberry Pi 2

Details

It was discovered that the IPv6 routing implementation in the Linux kernel
contained a reference counting error leading to a use-after-free
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code.

Update instructions

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

Ubuntu 19.10: linux-image-5.3.0-1004-aws – 5.3.0-1004.4; linux-image-5.3.0-1004-azure – 5.3.0-1004.4; linux-image-5.3.0-1004-kvm – 5.3.0-1004.4; linux-image-5.3.0-1005-gcp – 5.3.0-1005.5; linux-image-5.3.0-1008-raspi2 – 5.3.0-1008.9; linux-image-5.3.0-19-generic – 5.3.0-19.20; linux-image-5.3.0-19-generic-lpae – 5.3.0-19.20; linux-image-5.3.0-19-lowlatency – 5.3.0-19.20; linux-image-5.3.0-19-snapdragon – 5.3.0-19.20; linux-image-aws – 5.3.0.1004.5; linux-image-azure – 5.3.0.1004.21; linux-image-gcp – 5.3.0.1005.5; linux-image-generic – 5.3.0.19.22; linux-image-generic-lpae – 5.3.0.19.22; linux-image-gke – 5.3.0.1005.5; linux-image-kvm – 5.3.0.1004.4; linux-image-lowlatency – 5.3.0.19.22; linux-image-raspi2 – 5.3.0.1008.4; linux-image-snapdragon – 5.3.0.19.22; linux-image-virtual – 5.3.0.19.22

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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.