1. Ubuntu Security Notices
  2. USN-4161-1

USN-4161-1: Linux kernel vulnerability

Publication date

21 October 2019

Overview

The system could be made to crash under certain conditions.

Releases

Packages

  • 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.

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

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

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

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References

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