USN-3509-4: Linux kernel (Xenial HWE) regression

15 December 2017

linux-lts-xenial, linux-aws regression

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

  • Ubuntu 14.04 LTS


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

Software Description

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


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 -
linux-image-generic-lpae-lts-xenial -
linux-image-generic-lts-xenial -
linux-image-lowlatency-lts-xenial -
linux-image-powerpc-e500mc-lts-xenial -
linux-image-powerpc-smp-lts-xenial -
linux-image-powerpc64-emb-lts-xenial -
linux-image-powerpc64-smp-lts-xenial -

To update your system, please follow these instructions:

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.