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USN-3819-1: Linux kernel vulnerability

14 November 2018

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



  • 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


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

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

Ubuntu 18.10

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.


Related notices

  • USN-3820-3: linux-image-unsigned-4.15.0-1031-azure, linux-azure
  • USN-3820-2: linux-gcp, linux-image-unsigned-4.15.0-1031-azure, linux-hwe, linux-image-4.15.0-39-generic, linux-image-unsigned-4.15.0-1024-gcp, linux-image-4.15.0-39-generic-lpae, linux-image-4.15.0-39-lowlatency, linux-azure, linux-image-unsigned-4.15.0-39-generic, linux-image-unsigned-4.15.0-39-lowlatency
  • USN-3820-1: linux-image-unsigned-4.15.0-1031-azure, linux-image-unsigned-4.15.0-1024-gcp, linux-image-4.15.0-39-lowlatency, linux-gcp, linux-azure, linux-image-unsigned-4.15.0-39-generic, linux-image-unsigned-4.15.0-1026-oem, linux-image-4.15.0-1028-raspi2, linux-raspi2, linux-image-4.15.0-39-generic-lpae, linux-image-4.15.0-1026-kvm, linux-image-4.15.0-39-snapdragon, linux-kvm, linux, linux-aws, linux-oem, linux-image-4.15.0-1027-aws, linux-image-4.15.0-39-generic, linux-image-unsigned-4.15.0-39-lowlatency