Ubuntu 18.10: USN-3819-1 Critical Kernel Denial Of Service

ubuntu

November 14, 2018

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

Summary

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

Software Description:

- 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.

Topics Covered

security advisory denial of service kernel update critical ubuntu system crash linux kernel

Update Instructions

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

Ubuntu 18.10:
  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-4.18.0-1006-raspi2  4.18.0-1006.8
  linux-image-4.18.0-11-generic   4.18.0-11.12
  linux-image-4.18.0-11-generic-lpae  4.18.0-11.12
  linux-image-4.18.0-11-lowlatency  4.18.0-11.12
  linux-image-4.18.0-11-snapdragon  4.18.0-11.12
  linux-image-aws                 4.18.0.1004.4
  linux-image-gcp                 4.18.0.1003.3
  linux-image-generic             4.18.0.11.12
  linux-image-generic-lpae        4.18.0.11.12
  linux-image-gke                 4.18.0.1003.3
  linux-image-kvm                 4.18.0.1004.4
  linux-image-lowlatency          4.18.0.11.12
  linux-image-raspi2              4.18.0.1006.3
  linux-image-snapdragon          4.18.0.11.12

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.