Ubuntu Security Notices
USN-3256-1

USN-3256-1: Linux kernel vulnerability

Publication date

5 April 2017

Overview

The system could be made to crash under certain conditions.

Releases

16.10 16.04 LTS 14.04 LTS 12.04

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

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release	Package Version
16.10 yakkety	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
16.04 xenial	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
14.04 trusty	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
12.04 precise	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