7.2 - USN-3509-3

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

- Ubuntu 16.04 LTS

Summary:

USN-3509-1 introduced a regression in the Linux kernel for Ubuntu 16.04 LTS.

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

Details:

USN-3509-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 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 16.04 LTS:
linux-image-4.4.0-1013-kvm 4.4.0-1013.18
linux-image-4.4.0-104-generic 4.4.0-104.127
linux-image-4.4.0-104-generic-lpae 4.4.0-104.127
linux-image-4.4.0-104-lowlatency 4.4.0-104.127
linux-image-4.4.0-104-powerpc-e500mc 4.4.0-104.127
linux-image-4.4.0-104-powerpc-smp 4.4.0-104.127
linux-image-4.4.0-104-powerpc64-emb 4.4.0-104.127
linux-image-4.4.0-104-powerpc64-smp 4.4.0-104.127
linux-image-4.4.0-1044-aws 4.4.0-1044.53
linux-image-4.4.0-1080-raspi2 4.4.0-1080.88
linux-image-aws 4.4.0.1044.46
linux-image-generic 4.4.0.104.109
linux-image-generic-lpae 4.4.0.104.109
linux-image-kvm 4.4.0.1013.13
linux-image-lowlatency 4.4.0.104.109
linux-image-powerpc-e500mc 4.4.0.104.109
linux-image-powerpc-smp 4.4.0.104.109
linux-image-powerpc64-emb 4.4.0.104.109
linux-image-powerpc64-smp 4.4.0.104.109
linux-image-raspi2 4.4.0.1080.80

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-3509-3
https://www.ubuntu.com/usn/usn-3509-1
https://launchpad.net/bugs/1737033

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.4.0-104.127
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1044.53
https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1013.18
https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1080.88