Ubuntu 16.04 LTS USN-3630-2 Moderate: Linux Kernel DoS Threat

ubuntu

April 24, 2018

The system could be made to crash under certain conditions.

Summary

The system could be made to crash under certain conditions.

Software Description:

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-hwe: Linux hardware enablement (HWE) kernel

- linux-oem: Linux kernel for OEM processors

Details:

USN-3630-1 fixed a vulnerability in the Linux kernel for Ubuntu 17.10.

This update provides the corresponding updates for the Linux Hardware

Enablement (HWE) kernel from Ubuntu 17.10 for Ubuntu 16.04 LTS.

It was discovered that the Broadcom UniMAC MDIO bus controller driver in

the Linux kernel did not properly validate device resources. A local

attacker could use this to cause a denial of service (system crash).

Topics Covered

security advisory denial of service kernel ubuntu system crash linux-hwe linux-oem

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.13.0-1013-gcp     4.13.0-1013.17
  linux-image-4.13.0-1024-oem     4.13.0-1024.27
  linux-image-4.13.0-39-generic   4.13.0-39.44~16.04.1
  linux-image-4.13.0-39-generic-lpae  4.13.0-39.44~16.04.1
  linux-image-4.13.0-39-lowlatency  4.13.0-39.44~16.04.1
  linux-image-gcp                 4.13.0.1013.15
  linux-image-generic-hwe-16.04   4.13.0.39.58
  linux-image-generic-lpae-hwe-16.04  4.13.0.39.58
  linux-image-gke                 4.13.0.1013.15
  linux-image-lowlatency-hwe-16.04  4.13.0.39.58
  linux-image-oem                 4.13.0.1024.28

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.