4.9 - USN-3128-1

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

- Ubuntu 16.04 LTS

Summary:

The system could be made to crash under certain conditions.

Software Description: - linux: Linux kernel

Details:

Ondrej Kozina discovered that the keyring interface in the Linux kernel contained a buffer overflow when displaying timeout events via the /proc/keys interface. A local attacker could use this to cause a denial of service (system crash).

Update instructions:

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

Ubuntu 16.04 LTS:
linux-image-4.4.0-47-generic 4.4.0-47.68
linux-image-4.4.0-47-generic-lpae 4.4.0-47.68
linux-image-4.4.0-47-lowlatency 4.4.0-47.68
linux-image-4.4.0-47-powerpc-e500mc 4.4.0-47.68
linux-image-4.4.0-47-powerpc-smp 4.4.0-47.68
linux-image-4.4.0-47-powerpc64-emb 4.4.0-47.68
linux-image-4.4.0-47-powerpc64-smp 4.4.0-47.68
linux-image-generic 4.4.0.47.50
linux-image-generic-lpae 4.4.0.47.50
linux-image-lowlatency 4.4.0.47.50
linux-image-powerpc-e500mc 4.4.0.47.50
linux-image-powerpc-smp 4.4.0.47.50
linux-image-powerpc64-emb 4.4.0.47.50
linux-image-powerpc64-smp 4.4.0.47.50
linux-image-virtual 4.4.0.47.50

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:
http://www.ubuntu.com/usn/usn-3128-1
CVE-2016-7042

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.4.0-47.68