1. Ubuntu Security Notices
  2. USN-3846-1

USN-3846-1: Linux kernel vulnerability

Publication date

20 December 2018

Overview

The system could be made to expose sensitive information.

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 an integer overflow vulnerability existed in the
CDROM driver of the Linux kernel. A local attacker could use this to expose
sensitive information (kernel memory).

It was discovered that an integer overflow vulnerability existed in the
CDROM driver of the Linux kernel. A local attacker could use this to expose
sensitive information (kernel memory).

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
18.10 cosmic linux-image-gke –  4.18.0.1005.5
linux-image-4.18.0-1007-aws –  4.18.0-1007.9
linux-image-4.18.0-1005-gcp –  4.18.0-1005.6
linux-image-4.18.0-13-generic –  4.18.0-13.14
linux-image-generic –  4.18.0.13.14
linux-image-4.18.0-1007-azure –  4.18.0-1007.7
linux-image-gcp –  4.18.0.1005.5
linux-image-4.18.0-13-snapdragon –  4.18.0-13.14
linux-image-4.18.0-13-lowlatency –  4.18.0-13.14
linux-image-snapdragon –  4.18.0.13.14
linux-image-4.18.0-1008-raspi2 –  4.18.0-1008.10
linux-image-4.18.0-13-generic-lpae –  4.18.0-13.14
linux-image-generic-lpae –  4.18.0.13.14
linux-image-4.18.0-1006-kvm –  4.18.0-1006.6
linux-image-aws –  4.18.0.1007.7
linux-image-kvm –  4.18.0.1006.6
linux-image-lowlatency –  4.18.0.13.14
linux-image-azure –  4.18.0.1007.8
linux-image-raspi2 –  4.18.0.1008.5

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.

Get Ubuntu Pro

References

Have additional questions?

Talk to a member of the team ›