Do as Greg sayss [1]:
> All users of the 4.9 kernel series must upgrade.
Changes for Linux 4.9.13 [2][3]:
> Immediately after announcing the release of the first maintenance update
> to the Linux 4.10 kernel series, renowned kernel maintainer Greg
> Kroah-Hartman announced the availability of the Linux 4.9.13 and 4.4.52
> LTS kernels.
>
> This is a bit unexpected because it's been only three days since the
> Linux 4.9.12 and 4.4.51 LTS kernels have been released, so you can
> imagine that the changes implemented in today's Linux kernel 4.9.13,
> which was finally marked as longterm on kernel.org, and Linux kernel
> 4.4.52 LTS are kept to a minimum. According to their appended shortlogs,
> a total of 31 files were changed in Linux 4.9.13 LTS, with 365
> insertions and 122 deletions, and 24 files in Linux 4.4.52 LTS, with 218
> insertions and 121 deletions.
>
> "I'm announcing the release of the 4.9.13 [and 4.4.52] kernel. All users
> of the 4.9 [and 4.4.y] kernel series must upgrade. The updated 4.9.y git
> tree can be found at:
> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
> linux-4.9.y
>
> and the updated 4.4.y git tree can be found at:
> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
> linux-4.4.y, and can be browsed at the normal kernel.org git web
> browser:
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=summary,"
> said Greg Kroah-Hartman.
>
> ### Various networking improvements, updated drivers ###
>
> Both Linux 4.9.13 and 4.4.52 LTS kernels include a bunch of updated USB
> (ark3116, cp210x, mos7840, spcp8x5, opticon, and ftdi_sio), networking
> (Realtek rtlwifi, Mellanox mlx5 Ethernet), RTC and TTY drivers. A couple
> of small fixes have been implemented for the x86 architecture and XFS
> file system, and the networking stack was updated with various Datagram
> Congestion Control Protocol (DCCP), IrDA (Infrared Data Association),
> kernel connection multiplexer (KCM), Logical Link Control (LLC), and
> Netfilter improvements.
>
> If you're using a GNU/Linux distribution powered by a kernel from the
> long-term supported Linux 4.9 or 4.4 series, you are urged to update as
> soon as possible to the Linux kernel 4.9.13 LTS or Linux kernel 4.4.52
> LTS, which you can download from the stable repositories of your
> operating system when they become available there. OS vendors using
> these kernels are also urged to download the source tarballs right now
> from kernel.org or via our website and update their systems.
[1] https://lkml.org/lkml/2017/2/26/46
[2] http://news.softpedia.com/news/linux-kernels-4-9-13-and-4-4-52-lts-bring-updated-usb-drivers-networking-fixes-513333.shtml
[3] https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.13