Ubuntu 18.10 USN-3846-1 Critical: Linux Kernel Integer Overflow

ubuntu

December 20, 2018

The system could be made to expose sensitive information.

Summary

The system could be made to expose sensitive information.

Software Description:

- 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).

Topics Covered

security advisory Ubuntu update instructions integer overflow linux kernel sensitive information exposure cloud environments

Update Instructions

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

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

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.