Ubuntu

USN-3256-1: Linux kernel vulnerability

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Ubuntu Security Notice USN-3256-1

4th April, 2017

linux, linux-aws, linux-gke, linux-raspi2, linux-snapdragon, linux-ti-omap4 vulnerability

A security issue affects these releases of Ubuntu and its
derivatives:

  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary

The system could be made to crash under certain conditions.

Software description

  • 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 version:

Ubuntu 16.10:
linux-image-powerpc-smp 4.8.0.46.58
linux-image-powerpc-e500mc 4.8.0.46.58
linux-image-generic 4.8.0.46.58
linux-image-4.8.0-46-lowlatency

4.8.0-46.49
linux-image-4.8.0-46-generic-lpae

4.8.0-46.49
linux-image-4.8.0-46-powerpc-smp

4.8.0-46.49
linux-image-4.8.0-1033-raspi2

4.8.0-1033.36
linux-image-4.8.0-46-powerpc-e500mc

4.8.0-46.49
linux-image-generic-lpae 4.8.0.46.58
linux-image-4.8.0-46-powerpc64-emb

4.8.0-46.49
linux-image-4.8.0-46-generic

4.8.0-46.49
linux-image-lowlatency 4.8.0.46.58
linux-image-raspi2 4.8.0.1033.37
linux-image-powerpc64-smp 4.8.0.46.58
Ubuntu 16.04 LTS:
linux-image-powerpc-e500mc 4.4.0.72.78
linux-image-4.4.0-72-lowlatency

4.4.0-72.93
linux-image-4.4.0-72-powerpc-smp

4.4.0-72.93
linux-image-4.4.0-72-powerpc-e500mc

4.4.0-72.93
linux-image-4.4.0-1055-snapdragon

4.4.0-1055.59
linux-image-powerpc64-smp-lts-utopic 4.4.0.72.78
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-powerpc64-smp-lts-xenial 4.4.0.72.78
linux-image-4.4.0-72-powerpc64-smp

4.4.0-72.93
linux-image-gke 4.4.0.1010.12
linux-image-powerpc64-smp-lts-vivid 4.4.0.72.78
linux-image-generic 4.4.0.72.78
linux-image-snapdragon 4.4.0.1055.48
linux-image-aws 4.4.0.1013.16
linux-image-raspi2 4.4.0.1052.53
linux-image-powerpc-smp 4.4.0.72.78
linux-image-4.4.0-1052-raspi2

4.4.0-1052.59
linux-image-generic-lpae 4.4.0.72.78
linux-image-powerpc64-smp-lts-wily 4.4.0.72.78
linux-image-4.4.0-1013-aws

4.4.0-1013.22
linux-image-4.4.0-1010-gke

4.4.0-1010.10
linux-image-powerpc64-smp 4.4.0.72.78
linux-image-lowlatency 4.4.0.72.78
Ubuntu 14.04 LTS:
linux-image-powerpc-smp

3.13.0.116.126
linux-image-powerpc-e500mc

3.13.0.116.126
linux-image-generic

3.13.0.116.126
linux-image-generic-lpae

3.13.0.116.126
linux-image-3.13.0-116-powerpc64-smp

3.13.0-116.163
linux-image-3.13.0-116-powerpc-e500mc

3.13.0-116.163
linux-image-3.13.0-116-lowlatency

3.13.0-116.163
linux-image-powerpc-e500

3.13.0.116.126
linux-image-3.13.0-116-generic

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-smp

3.13.0-116.163
linux-image-powerpc64-smp

3.13.0.116.126
linux-image-lowlatency

3.13.0.116.126
linux-image-3.13.0-116-generic-lpae

3.13.0-116.163
Ubuntu 12.04 LTS:
linux-image-3.2.0-126-virtual

3.2.0-126.169
linux-image-3.2.0-126-highbank

3.2.0-126.169
linux-image-3.2.0-1504-omap4

3.2.0-1504.131
linux-image-3.2.0-126-generic-pae

3.2.0-126.169
linux-image-powerpc-smp 3.2.0.126.141
linux-image-generic 3.2.0.126.141
linux-image-3.2.0-126-omap

3.2.0-126.169
linux-image-3.2.0-126-generic

3.2.0-126.169
linux-image-generic-pae 3.2.0.126.141
linux-image-highbank 3.2.0.126.141
linux-image-3.2.0-126-powerpc64-smp

3.2.0-126.169
linux-image-powerpc64-smp 3.2.0.126.141
linux-image-omap4 3.2.0.1504.99
linux-image-3.2.0-126-powerpc-smp

3.2.0-126.169
linux-image-omap 3.2.0.126.141
linux-image-virtual 3.2.0.126.141

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

CVE-2017-7308

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