This update is based on upstream 4.4.39 and fixes at least the following security issues:
Due to lack of size checking on ICMP header length, it is possible to cause out-of-bounds read on stack (CVE-2016-8399)
A use-after-free vulnerability in the SCSI generic driver allows users with write access to /dev/sg* or /dev/bsg* to elevate their privileges (CVE-2016-9576).
A use-after-free vulnerability was found in ALSA pcm layer, which allows local users to cause a denial of service, memory corruption, or possibly other unspecified impact (CVE-2016-9794).
Other fixes in this update: - fix for HID gamepad DragonRise (mga#19853) - fix for radeon driver crashing on Dell Precision M4800 (mga#19892)
For other upstream fixes in this update, see the referenced changelogs.