[USN-3509-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3509-1
December 07, 2017

linux, linux-aws, linux-kvm, 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-kvm: Linux kernel for cloud environments
- linux-raspi2: Linux kernel for Raspberry Pi 2
- linux-snapdragon: Linux kernel for Snapdragon processors

Details:

Mohamed Ghannam discovered that a use-after-free vulnerability existed in
the Netlink subsystem (XFRM) in the Linux kernel. A local attacker could
use this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2017-16939)

It was discovered that the Linux kernel did not properly handle copy-on-
write of transparent huge pages. A local attacker could use this to cause a
denial of service (application crashes) or possibly gain administrative
privileges. (CVE-2017-1000405)

Fan Wu, Haoran Qiu, and Shixiong Zhao discovered that the associative array
implementation in the Linux kernel sometimes did not properly handle adding
a new entry. A local attacker could use this to cause a denial of service
(system crash). (CVE-2017-12193)

Andrey Konovalov discovered an out-of-bounds read in the GTCO digitizer USB
driver for the Linux kernel. A physically proximate attacker could use this
to cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2017-16643)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1012-kvm      4.4.0-1012.17
  linux-image-4.4.0-103-generic   4.4.0-103.126
  linux-image-4.4.0-103-generic-lpae  4.4.0-103.126
  linux-image-4.4.0-103-lowlatency  4.4.0-103.126
  linux-image-4.4.0-103-powerpc-e500mc  4.4.0-103.126
  linux-image-4.4.0-103-powerpc-smp  4.4.0-103.126
  linux-image-4.4.0-103-powerpc64-emb  4.4.0-103.126
  linux-image-4.4.0-103-powerpc64-smp  4.4.0-103.126
  linux-image-4.4.0-1043-aws      4.4.0-1043.52
  linux-image-4.4.0-1079-raspi2   4.4.0-1079.87
  linux-image-4.4.0-1081-snapdragon  4.4.0-1081.86
  linux-image-aws                 4.4.0.1043.45
  linux-image-generic             4.4.0.103.108
  linux-image-generic-lpae        4.4.0.103.108
  linux-image-kvm                 4.4.0.1012.12
  linux-image-lowlatency          4.4.0.103.108
  linux-image-powerpc-e500mc      4.4.0.103.108
  linux-image-powerpc-smp         4.4.0.103.108
  linux-image-powerpc64-emb       4.4.0.103.108
  linux-image-powerpc64-smp       4.4.0.103.108
  linux-image-raspi2              4.4.0.1079.79
  linux-image-snapdragon          4.4.0.1081.73

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-3509-1
  CVE-2017-1000405, CVE-2017-12193, CVE-2017-16643, CVE-2017-16939

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-103.126
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1043.52
  https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1012.17
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1079.87
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1081.86

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