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USN-3444-1: Linux kernel vulnerabilities

10 October 2017

Several security issues were fixed in the Linux kernel.

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  • 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)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 16.04

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.

Related notices

  • USN-3655-1: linux-image-3.13.0-149-powerpc-e500mc, linux-image-3.13.0-149-powerpc64-emb, linux, linux-image-3.13.0-149-lowlatency, linux-image-3.13.0-149-powerpc-e500, linux-image-extra-3.13.0-149-generic, linux-image-3.13.0-149-generic-lpae, linux-image-3.13.0-149-generic, linux-image-3.13.0-149-powerpc-smp, linux-image-3.13.0-149-powerpc64-smp
  • USN-3444-2: linux-image-4.4.0-97-generic, linux-image-4.4.0-97-powerpc64-emb, linux-image-4.4.0-97-powerpc-smp, linux-image-extra-4.4.0-97-generic, linux-image-4.4.0-97-lowlatency, linux-image-4.4.0-97-powerpc64-smp, linux-image-4.4.0-97-generic-lpae, linux-image-4.4.0-97-powerpc-e500mc, linux-lts-xenial
  • USN-3655-2: linux-lts-trusty, linux-image-3.13.0-149-generic-lpae, linux-image-generic-lts-trusty, linux-image-3.13.0-149-generic, linux-image-generic-lpae-lts-trusty
  • USN-3443-2: linux-image-4.10.0-37-generic, linux-image-4.10.0-37-generic-lpae, linux-hwe, linux-image-4.10.0-37-lowlatency, linux-image-extra-4.10.0-37-generic
  • USN-3443-3: linux-image-4.10.0-1007-gcp, linux-image-extra-4.10.0-1007-gcp, linux-gcp
  • USN-3443-1: linux-image-4.10.0-1019-raspi2, linux-image-generic-lpae, linux-image-4.10.0-37-generic, linux-image-4.10.0-37-generic-lpae, linux, linux-image-powerpc-e500mc, linux-image-powerpc64-emb, linux-image-powerpc64-smp, linux-image-lowlatency, linux-image-powerpc-smp, linux-image-raspi2, linux-image-4.10.0-37-lowlatency, linux-image-generic, linux-raspi2, linux-image-virtual
  • USN-3445-1: linux-image-3.13.0-133-powerpc-e500, linux-image-3.13.0-133-powerpc-smp, linux-image-3.13.0-133-powerpc64-smp, linux, linux-image-3.13.0-133-generic-lpae, linux-image-3.13.0-133-powerpc64-emb, linux-image-extra-3.13.0-133-generic, linux-image-3.13.0-133-lowlatency, linux-image-3.13.0-133-generic, linux-image-3.13.0-133-powerpc-e500mc
  • USN-3445-2: linux-lts-trusty, linux-image-3.13.0-133-generic-lpae, linux-image-generic-lts-trusty, linux-image-3.13.0-133-generic, linux-image-generic-lpae-lts-trusty
  • USN-3583-2: linux-lts-trusty, linux-image-3.13.0-142-generic, linux-image-generic-lts-trusty, linux-image-3.13.0-142-generic-lpae, linux-image-generic-lpae-lts-trusty
  • USN-3583-1: linux-image-3.13.0-142-powerpc-smp, linux-image-3.13.0-142-powerpc64-emb, linux-image-3.13.0-142-powerpc64-smp, linux-image-3.13.0-142-lowlatency, linux, linux-image-3.13.0-142-generic, linux-image-3.13.0-142-powerpc-e500mc, linux-image-3.13.0-142-powerpc-e500, linux-image-3.13.0-142-generic-lpae, linux-image-extra-3.13.0-142-generic