USN-3444-1: Linux kernel vulnerabilities

10 October 2017

Several security issues were fixed in the Linux kernel.

Releases

Packages

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