Do as Greg says [1]:
> All users of the 4.9 kernel series must upgrade.
Changes for Linux 4.9.17 [2][3]:
> Immediately after announcing the release of the Linux 4.10.5
> kernel, Greg Kroah-Hartman informed us about the immediate
> availability of the seventeenth maintenance update to the
> long-term supported Linux 4.9 kernel series.
>
> Just like Linux kernel 4.10.5, the Linux 4.9.17 LTS kernel is
> here only four days after the previous maintenance release, in
> this case Linux kernel 4.9.16 LTS. But this one is a major
> release adding changes to a total of 112 files, with 1815
> insertions and 1271 deletions, according to the appended shortlog.
> Therefore, it is recommended that you update your systems to
> the new version as soon as possible.
>
> "I'm announcing the release of the 4.9.17 kernel. All users of
> the 4.9 kernel series must upgrade. The updated 4.9.y git treexi
> can be found at:
> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
> linux-4.9.y and can be browsed at the normal kernel.org gitxi
> web browser:
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=summary,"
> said Greg Kroah-Hartman.
>
> "Nouveau updates, networking improvements"
>
> Among the changes included in the Linux 4.9.17 LTS kernel, we can
> notice lots of improvements to the Nouveau open-source graphics
> driver for Nvidia GPUs, along with various other fixes to the
> Ethernet (IBM, Intel, Mellanox), PCI, s390, SCSI, TTY, USB, VFIO,
> DMA, CLK, and ACPI drivers. Some issues were also resolved for the
> x86, PowerPC (PPC), and AArch64 (ARM64) architectures.
>
> Besides the usual core kernel and mm changes, Linux kernel 4.9.17 LTS
> updates the networking stack with various improvements to things
> like IPv4, IPv6, Bridge, Datagram Congestion Control Protocol (DCCP),
> Layer 2 Tunneling Protocol (L2TP), Multiprotocol Label Switching
> (MPLS), Open vSwitch, StrParser, and the packet scheduler. You can
> download the Linux kernel 4.9.17 LTS source tarball right now from
> kernel.org.
[1] https://lkml.org/lkml/2017/3/22/275
[2] http://news.softpedia.com/news/linux-kernel-4-9-17-lts-is-out-with-dozen-of-nouveau-and-networking-improvements-514183.shtml
[3] https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.17