Ubuntu 16.10: USN-3256-1 Critical: Kernel Denial Of Service

ubuntu

April 5, 2017

The system could be made to crash under certain conditions.

Summary

The system could be made to crash under certain conditions.

Software Description:

- linux: Linux kernel

- linux-raspi2: Linux kernel for Raspberry Pi 2

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

- linux-gke: Linux kernel for Google Container Engine (GKE) systems

- 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).

Topics Covered

security advisory denial of service critical Ubuntu kernel system crash

Update Instructions

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

Ubuntu 16.10:
  linux-image-4.8.0-1033-raspi2   4.8.0-1033.36
  linux-image-4.8.0-46-generic    4.8.0-46.49
  linux-image-4.8.0-46-generic-lpae  4.8.0-46.49
  linux-image-4.8.0-46-lowlatency  4.8.0-46.49
  linux-image-4.8.0-46-powerpc-e500mc  4.8.0-46.49
  linux-image-4.8.0-46-powerpc-smp  4.8.0-46.49
  linux-image-4.8.0-46-powerpc64-emb  4.8.0-46.49
  linux-image-generic             4.8.0.46.58
  linux-image-generic-lpae        4.8.0.46.58
  linux-image-lowlatency          4.8.0.46.58
  linux-image-powerpc-e500mc      4.8.0.46.58
  linux-image-powerpc-smp         4.8.0.46.58
  linux-image-powerpc64-smp       4.8.0.46.58
  linux-image-raspi2              4.8.0.1033.37

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1010-gke      4.4.0-1010.10
  linux-image-4.4.0-1013-aws      4.4.0-1013.22
  linux-image-4.4.0-1052-raspi2   4.4.0-1052.59
  linux-image-4.4.0-1055-snapdragon  4.4.0-1055.59
  linux-image-4.4.0-72-generic    4.4.0-72.93
  linux-image-4.4.0-72-generic-lpae  4.4.0-72.93
  linux-image-4.4.0-72-lowlatency  4.4.0-72.93
  linux-image-4.4.0-72-powerpc-e500mc  4.4.0-72.93
  linux-image-4.4.0-72-powerpc-smp  4.4.0-72.93
  linux-image-4.4.0-72-powerpc64-smp  4.4.0-72.93
  linux-image-aws                 4.4.0.1013.16
  linux-image-generic             4.4.0.72.78
  linux-image-generic-lpae        4.4.0.72.78
  linux-image-gke                 4.4.0.1010.12
  linux-image-lowlatency          4.4.0.72.78
  linux-image-powerpc-e500mc      4.4.0.72.78
  linux-image-powerpc-smp         4.4.0.72.78
  linux-image-powerpc64-smp       4.4.0.72.78
  linux-image-powerpc64-smp-lts-utopic  4.4.0.72.78
  linux-image-powerpc64-smp-lts-vivid  4.4.0.72.78
  linux-image-powerpc64-smp-lts-wily  4.4.0.72.78
  linux-image-powerpc64-smp-lts-xenial  4.4.0.72.78
  linux-image-raspi2              4.4.0.1052.53
  linux-image-snapdragon          4.4.0.1055.48

Ubuntu 14.04 LTS:
  linux-image-3.13.0-116-generic  3.13.0-116.163
  linux-image-3.13.0-116-generic-lpae  3.13.0-116.163
  linux-image-3.13.0-116-lowlatency  3.13.0-116.163
  linux-image-3.13.0-116-powerpc-e500  3.13.0-116.163
  linux-image-3.13.0-116-powerpc-e500mc  3.13.0-116.163
  linux-image-3.13.0-116-powerpc-smp  3.13.0-116.163
  linux-image-3.13.0-116-powerpc64-smp  3.13.0-116.163
  linux-image-generic             3.13.0.116.126
  linux-image-generic-lpae        3.13.0.116.126
  linux-image-lowlatency          3.13.0.116.126
  linux-image-powerpc-e500        3.13.0.116.126
  linux-image-powerpc-e500mc      3.13.0.116.126
  linux-image-powerpc-smp         3.13.0.116.126
  linux-image-powerpc64-smp       3.13.0.116.126

Ubuntu 12.04 LTS:
  linux-image-3.2.0-126-generic   3.2.0-126.169
  linux-image-3.2.0-126-generic-pae  3.2.0-126.169
  linux-image-3.2.0-126-highbank  3.2.0-126.169
  linux-image-3.2.0-126-omap      3.2.0-126.169
  linux-image-3.2.0-126-powerpc-smp  3.2.0-126.169
  linux-image-3.2.0-126-powerpc64-smp  3.2.0-126.169
  linux-image-3.2.0-126-virtual   3.2.0-126.169
  linux-image-3.2.0-1504-omap4    3.2.0-1504.131
  linux-image-generic             3.2.0.126.141
  linux-image-generic-pae         3.2.0.126.141
  linux-image-highbank            3.2.0.126.141
  linux-image-omap                3.2.0.126.141
  linux-image-omap4               3.2.0.1504.99
  linux-image-powerpc-smp         3.2.0.126.141
  linux-image-powerpc64-smp       3.2.0.126.141
  linux-image-virtual             3.2.0.126.141

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.