Ubuntu 16.04 LTS: USN-3847-2 Critical: Kernel Denial of Service

ubuntu

December 20, 2018

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

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

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

Details:

USN-3847-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04

LTS. This update provides the corresponding updates for the Linux

Hardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu

16.04 LTS.

It was discovered that a race condition existed in the raw MIDI driver for

the Linux kernel, leading to a double free vulnerability. A local attacker

could use this to cause a denial of service (system crash) or possibly

execute arbitrary code. (CVE-2018-10902)

It was discovered that an integer overrun vulnerability existed in the

POSIX timers implementation in the Linux kernel. A local attacker could use

this to cause a denial of serv...

Read the Full Advisory

Topics Covered

security advisory denial of service Ubuntu system update kernel issues CVE details HWE release

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1026-gcp     4.15.0-1026.27~16.04.1
  linux-image-4.15.0-1031-aws     4.15.0-1031.33~16.04.1
  linux-image-4.15.0-1036-azure   4.15.0-1036.38~16.04.1
  linux-image-4.15.0-43-generic   4.15.0-43.46~16.04.1
  linux-image-4.15.0-43-generic-lpae  4.15.0-43.46~16.04.1
  linux-image-4.15.0-43-lowlatency  4.15.0-43.46~16.04.1
  linux-image-aws-hwe             4.15.0.1031.32
  linux-image-azure               4.15.0.1036.41
  linux-image-gcp                 4.15.0.1026.40
  linux-image-generic-hwe-16.04   4.15.0.43.64
  linux-image-generic-lpae-hwe-16.04  4.15.0.43.64
  linux-image-gke                 4.15.0.1026.40
  linux-image-lowlatency-hwe-16.04  4.15.0.43.64

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.