USN-3444-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-3444-1

10th October, 2017

linux, linux-aws, linux-gke, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 16.04 LTS


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-gke - Linux kernel for Google Container Engine (GKE) systems
  • linux-kvm - Linux kernel for cloud environments
  • linux-raspi2 - Linux kernel for Raspberry Pi 2
  • linux-snapdragon - Linux kernel for Snapdragon processors


Jan H. Schönherr discovered that the Xen subsystem did not properly handle
block IO merges correctly in some situations. An attacker in a guest vm
could use this to cause a denial of service (host crash) or possibly gain
administrative privileges in the host. (CVE-2017-12134)

Andrey Konovalov discovered that a divide-by-zero error existed in the TCP
stack implementation in the Linux kernel. A local attacker could use this
to cause a denial of service (system crash). (CVE-2017-14106)

Otto Ebeling discovered that the memory manager in the Linux kernel did not
properly check the effective UID in some situations. A local attacker could
use this to expose sensitive information. (CVE-2017-14140)

Update instructions

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

Ubuntu 16.04 LTS:
linux-image-4.4.0-97-lowlatency 4.4.0-97.120
linux-image-4.4.0-1032-gke 4.4.0-1032.32
linux-image-4.4.0-97-generic 4.4.0-97.120
linux-image-4.4.0-1075-raspi2 4.4.0-1075.83
linux-image-4.4.0-1008-kvm 4.4.0-1008.13
linux-image-4.4.0-97-powerpc-smp 4.4.0-97.120
linux-image-4.4.0-97-powerpc64-smp 4.4.0-97.120
linux-image-4.4.0-97-powerpc-e500mc 4.4.0-97.120
linux-image-4.4.0-97-generic-lpae 4.4.0-97.120
linux-image-4.4.0-1077-snapdragon 4.4.0-1077.82
linux-image-4.4.0-97-powerpc64-emb 4.4.0-97.120
linux-image-4.4.0-1038-aws 4.4.0-1038.47

To update your system, please follow these instructions:

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.


CVE-2017-12134, CVE-2017-14106, CVE-2017-14140