Security update for the Linux Kernel (Live Patch 4 for SLE 12 SP3) (important)

This update for the Linux Kernel 4.4.90-6_12 fixes several issues.

The following security issues were fixed:

• CVE-2017-1000405: Problematic use of pmd_mkdirty() in the touch_pmd()
  function allowed users to overwrite read-only huge pages (e.g. the zero
  huge page and sealed shmem files) (bsc#1070307).
• CVE-2017-16939: The XFRM dump policy implementation in
  net/xfrm/xfrm_user.c kernel allowed local users to gain privileges or
  cause a denial of service (use-after-free) via a crafted SO_RCVBUF
  setsockopt system call in conjunction with XFRM_MSG_GETPOLICY Netlink
  messages (bsc#1069708).