Ubuntu 16.04 LTS: USN-3444-1 Critical: Kernel Denial Of Service Threat

ubuntu

October 11, 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-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

Details:

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

proper...

Read the Full Advisory

Topics Covered

security advisory denial of service kernel system update ubuntu issue fix linux software

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1008-kvm      4.4.0-1008.13
  linux-image-4.4.0-1032-gke      4.4.0-1032.32
  linux-image-4.4.0-1038-aws      4.4.0-1038.47
  linux-image-4.4.0-1075-raspi2   4.4.0-1075.83
  linux-image-4.4.0-1077-snapdragon  4.4.0-1077.82
  linux-image-4.4.0-97-generic    4.4.0-97.120
  linux-image-4.4.0-97-generic-lpae  4.4.0-97.120
  linux-image-4.4.0-97-lowlatency  4.4.0-97.120
  linux-image-4.4.0-97-powerpc-e500mc  4.4.0-97.120
  linux-image-4.4.0-97-powerpc-smp  4.4.0-97.120
  linux-image-4.4.0-97-powerpc64-emb  4.4.0-97.120
  linux-image-4.4.0-97-powerpc64-smp  4.4.0-97.120
  linux-image-aws                 4.4.0.1038.40
  linux-image-generic             4.4.0.97.102
  linux-image-generic-lpae        4.4.0.97.102
  linux-image-gke                 4.4.0.1032.33
  linux-image-kvm                 4.4.0.1008.8
  linux-image-lowlatency          4.4.0.97.102
  linux-image-powerpc-e500mc      4.4.0.97.102
  linux-image-powerpc-smp         4.4.0.97.102
  linux-image-powerpc64-emb       4.4.0.97.102
  linux-image-powerpc64-smp       4.4.0.97.102
  linux-image-raspi2              4.4.0.1075.75
  linux-image-snapdragon          4.4.0.1077.69

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.