[USN-3385-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3385-1
August 11, 2017

linux, linux-aws, linux-gke, linux-raspi2, linux-snapdragon vulnerabilities
==========================================================================

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

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

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

Details:

Andrey Konovalov discovered a race condition in the UDP Fragmentation
Offload (UFO) code in the Linux kernel. A local attacker could use this to
cause a denial of service or execute arbitrary code. (CVE-2017-1000112)

Andrey Konovalov discovered a race condition in AF_PACKET socket option
handling code in the Linux kernel. A local unprivileged attacker could use
this to cause a denial of service or possibly execute arbitrary code.
(CVE-2017-1000111)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1026-gke      4.4.0-1026.26
  linux-image-4.4.0-1030-aws      4.4.0-1030.39
  linux-image-4.4.0-1069-raspi2   4.4.0-1069.77
  linux-image-4.4.0-1071-snapdragon  4.4.0-1071.76
  linux-image-4.4.0-91-generic    4.4.0-91.114
  linux-image-4.4.0-91-generic-lpae  4.4.0-91.114
  linux-image-4.4.0-91-lowlatency  4.4.0-91.114
  linux-image-4.4.0-91-powerpc-e500mc  4.4.0-91.114
  linux-image-4.4.0-91-powerpc-smp  4.4.0-91.114
  linux-image-4.4.0-91-powerpc64-emb  4.4.0-91.114
  linux-image-4.4.0-91-powerpc64-smp  4.4.0-91.114
  linux-image-aws                 4.4.0.1030.32
  linux-image-generic             4.4.0.91.96
  linux-image-generic-lpae        4.4.0.91.96
  linux-image-gke                 4.4.0.1026.27
  linux-image-lowlatency          4.4.0.91.96
  linux-image-powerpc-e500mc      4.4.0.91.96
  linux-image-powerpc-smp         4.4.0.91.96
  linux-image-powerpc64-emb       4.4.0.91.96
  linux-image-powerpc64-smp       4.4.0.91.96
  linux-image-raspi2              4.4.0.1069.69
  linux-image-snapdragon          4.4.0.1071.63

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:
  https://www.ubuntu.com/usn/usn-3385-1
  CVE-2017-1000111, CVE-2017-1000112

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-91.114
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1030.39
  https://launchpad.net/ubuntu/+source/linux-gke/4.4.0-1026.26
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1069.77
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1071.76

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