Ubuntu 16.04 LTS: USN-3509-1 Critical: Kernel Denial Of Service

ubuntu

December 8, 2017

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:

Mohamed Ghannam discovered that a use-after-free vulnerability existed in

the Netlink subsystem (XFRM) in the Linux kernel. A local attacker could

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

arbitrary code. (CVE-2017-16939)

It was discovered that the Linux kernel did not properly handle copy-on-

write of transparent huge pages. A local attacker could use this to cause a

denial of service (application crashes) or possibly gain administrative

privileges. (CVE-2017-1000405)

Fan Wu, Haoran Qiu, and Shixiong Zhao discovered that the associative array

implementation in the Linux kernel sometimes did not properly handle adding

a new ...

Read the Full Advisory

Topics Covered

security advisory denial of service security fix kernel system update ubuntu

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1012-kvm      4.4.0-1012.17
  linux-image-4.4.0-103-generic   4.4.0-103.126
  linux-image-4.4.0-103-generic-lpae  4.4.0-103.126
  linux-image-4.4.0-103-lowlatency  4.4.0-103.126
  linux-image-4.4.0-103-powerpc-e500mc  4.4.0-103.126
  linux-image-4.4.0-103-powerpc-smp  4.4.0-103.126
  linux-image-4.4.0-103-powerpc64-emb  4.4.0-103.126
  linux-image-4.4.0-103-powerpc64-smp  4.4.0-103.126
  linux-image-4.4.0-1043-aws      4.4.0-1043.52
  linux-image-4.4.0-1079-raspi2   4.4.0-1079.87
  linux-image-4.4.0-1081-snapdragon  4.4.0-1081.86
  linux-image-aws                 4.4.0.1043.45
  linux-image-generic             4.4.0.103.108
  linux-image-generic-lpae        4.4.0.103.108
  linux-image-kvm                 4.4.0.1012.12
  linux-image-lowlatency          4.4.0.103.108
  linux-image-powerpc-e500mc      4.4.0.103.108
  linux-image-powerpc-smp         4.4.0.103.108
  linux-image-powerpc64-emb       4.4.0.103.108
  linux-image-powerpc64-smp       4.4.0.103.108
  linux-image-raspi2              4.4.0.1079.79
  linux-image-snapdragon          4.4.0.1081.73

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.