1. Ubuntu Security Notices
  2. USN-3819-1

USN-3819-1: Linux kernel vulnerability

Publication date

14 November 2018

Overview

The system could be made to crash or run programs as an administrator.

Releases

Packages

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) 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

Felix Wilhelm discovered that the Xen netback driver in the Linux kernel
did not properly perform input validation in some situations. An attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code.

Felix Wilhelm discovered that the Xen netback driver in the Linux kernel
did not properly perform input validation in some situations. An 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
18.10 cosmic linux-image-4.18.0-11-generic-lpae –  4.18.0-11.12
linux-image-gke –  4.18.0.1003.3
linux-image-4.18.0-1003-gcp –  4.18.0-1003.4
linux-image-4.18.0-1004-aws –  4.18.0-1004.5
linux-image-4.18.0-1004-kvm –  4.18.0-1004.4
linux-image-generic-lpae –  4.18.0.11.12
linux-image-4.18.0-1006-raspi2 –  4.18.0-1006.8
linux-image-4.18.0-11-lowlatency –  4.18.0-11.12
linux-image-4.18.0-11-generic –  4.18.0-11.12
linux-image-generic –  4.18.0.11.12
linux-image-snapdragon –  4.18.0.11.12
linux-image-aws –  4.18.0.1004.4
linux-image-kvm –  4.18.0.1004.4
linux-image-gcp –  4.18.0.1003.3
linux-image-lowlatency –  4.18.0.11.12
linux-image-raspi2 –  4.18.0.1006.3
linux-image-4.18.0-11-snapdragon –  4.18.0-11.12

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References

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