[USN-3509-4] Linux kernel (Xenial HWE) regression

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3509-4
December 15, 2017

linux-lts-xenial, linux-aws regression
==========================================================================

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

- Ubuntu 14.04 LTS

Summary:

USN-3509-2 introduced a regression in the Linux HWE kernel for Ubuntu 14.04 LTS.

Software Description:
- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

Details:

USN-3509-2 fixed vulnerabilities in the Linux Hardware Enablement
kernel for Ubuntu 14.04 LTS.  Unfortunately, it also introduced a
regression that prevented the Ceph network filesystem from being
used. This update fixes the problem.

We apologize for the inconvenience.

Original advisory 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 14.04 LTS:
  linux-image-4.4.0-1006-aws      4.4.0-1006.6
  linux-image-4.4.0-104-generic   4.4.0-104.127~14.04.1
  linux-image-4.4.0-104-generic-lpae  4.4.0-104.127~14.04.1
  linux-image-4.4.0-104-lowlatency  4.4.0-104.127~14.04.1
  linux-image-4.4.0-104-powerpc-e500mc  4.4.0-104.127~14.04.1
  linux-image-4.4.0-104-powerpc-smp  4.4.0-104.127~14.04.1
  linux-image-4.4.0-104-powerpc64-emb  4.4.0-104.127~14.04.1
  linux-image-4.4.0-104-powerpc64-smp  4.4.0-104.127~14.04.1
  linux-image-aws                 4.4.0.1006.6
  linux-image-generic-lpae-lts-xenial  4.4.0.104.87
  linux-image-generic-lts-xenial  4.4.0.104.87
  linux-image-lowlatency-lts-xenial  4.4.0.104.87
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.104.87
  linux-image-powerpc-smp-lts-xenial  4.4.0.104.87
  linux-image-powerpc64-emb-lts-xenial  4.4.0.104.87
  linux-image-powerpc64-smp-lts-xenial  4.4.0.104.87

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-3509-4
  https://www.ubuntu.com/usn/usn-3509-2
  https://www.ubuntu.com/usn/usn-3509-1
  https://launchpad.net/bugs/1737033

Package Information:
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1006.6
  https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-104.127~14.04.1

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