USN-3256-1: Linux kernel vulnerability

05 April 2017

The system could be made to crash under certain conditions.

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-raspi2 - Linux kernel for Raspberry Pi 2
  • linux-snapdragon - Linux kernel for Snapdragon Processors
  • linux-ti-omap4 - Linux kernel for OMAP4

Details

Andrey Konovalov discovered that the AF_PACKET implementation in the Linux
kernel did not properly validate certain block-size data. A local attacker
could use this to cause a denial of service (system crash).

Update instructions

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

Ubuntu 16.10
Ubuntu 16.04
Ubuntu 14.04
Ubuntu 12.04

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.

References

Related notices

  • USN-3256-2: linux-image-4.4.0-72-powerpc-smp, linux-image-4.4.0-72-powerpc64-smp, linux-image-generic-hwe-16.04, linux-image-4.4.0-72-powerpc-e500mc, linux-lts-xenial, linux-image-generic-lpae-hwe-16.04, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.8.0-46-generic, linux-image-4.8.0-46-lowlatency, linux-image-4.4.0-72-lowlatency, linux-image-generic-lpae-lts-trusty, linux-image-4.4.0-72-generic-lpae, linux-image-powerpc64-smp-lts-xenial, linux-image-generic-lts-trusty, linux-image-3.13.0-116-generic, linux-image-3.13.0-116-generic-lpae, linux-image-4.4.0-72-generic, linux-image-generic-lts-xenial, linux-hwe, linux-image-powerpc-smp-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-image-lowlatency-lts-xenial, linux-lts-trusty, linux-image-4.8.0-46-generic-lpae, linux-image-lowlatency-hwe-16.04