Ubuntu 16.04 LTS: USN-3631-1 Moderate: Kernel Security Issues Report

ubuntu

April 24, 2018

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

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

- linux-kvm: Linux kernel for cloud environments

- linux-raspi2: Linux kernel for Raspberry Pi 2

- linux-snapdragon: Linux kernel for Snapdragon processors

Details:

It was discovered that a buffer overread vulnerability existed in the

keyring subsystem of the Linux kernel. A local attacker could possibly use

this to expose sensitive information (kernel memory). (CVE-2017-13305)

It was discovered that the DM04/QQBOX USB driver in the Linux kernel did

not properly handle device attachment and warm-start. A physically

proximate attacker could use this to cause a denial of service (system

crash) or possibly execute arbitrary code. (CVE-2017-16538)

Luo Quan and Wei Yang discovered that a race condition existed in the

Advanced Linux Sound Architecture (ALSA) subsystem of the Linux kernel when

handli...

Read the Full Advisory

Topics Covered

security advisory denial of service kernel update instructions ubuntu system crash buffer overread

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1021-kvm      4.4.0-1021.26
  linux-image-4.4.0-1055-aws      4.4.0-1055.64
  linux-image-4.4.0-1087-raspi2   4.4.0-1087.95
  linux-image-4.4.0-1090-snapdragon  4.4.0-1090.95
  linux-image-4.4.0-121-generic   4.4.0-121.145
  linux-image-4.4.0-121-generic-lpae  4.4.0-121.145
  linux-image-4.4.0-121-lowlatency  4.4.0-121.145
  linux-image-4.4.0-121-powerpc-e500mc  4.4.0-121.145
  linux-image-4.4.0-121-powerpc-smp  4.4.0-121.145
  linux-image-4.4.0-121-powerpc64-emb  4.4.0-121.145
  linux-image-4.4.0-121-powerpc64-smp  4.4.0-121.145
  linux-image-aws                 4.4.0.1055.57
  linux-image-generic             4.4.0.121.127
  linux-image-generic-lpae        4.4.0.121.127
  linux-image-kvm                 4.4.0.1021.20
  linux-image-lowlatency          4.4.0.121.127
  linux-image-powerpc-e500mc      4.4.0.121.127
  linux-image-powerpc-smp         4.4.0.121.127
  linux-image-powerpc64-emb       4.4.0.121.127
  linux-image-powerpc64-smp       4.4.0.121.127
  linux-image-raspi2              4.4.0.1087.87
  linux-image-snapdragon          4.4.0.1090.82

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.