Ubuntu 19.10: USN-4161-1 Critical: Linux Kernel Crash Risk

ubuntu

October 21, 2019

The system could be made to crash under certain conditions.

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.

Topics Covered

security advisory kernel ubuntu system crash denial-of-service use-after-free

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

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.