Security update for Linux Kernel Live Patch 21 for SLE 12 SP1 (important)

This update for the Linux Kernel 3.12.74-60_64_60 fixes several issues.

The following security bugs were fixed:

• CVE-2017-15274: security/keys/keyctl.c in the Linux kernel did not
  consider the case of a NULL payload in conjunction with a nonzero length
  value, which allowed local users to cause a denial of service (NULL
  pointer dereference and OOPS) via a crafted add_key or keyctl system
  call (bsc#1045327).
• CVE-2017-1000112: Updated patch for this issue to be in sync with the
  other livepatches. Description of the issue: Prevent race condition in
  net-packet code that could have been exploited by unprivileged users to
  gain root access (bsc#1052368, bsc#1052311).
• CVE-2017-9242: The __ip6_append_data function in net/ipv6/ip6_output.c
  was too late in checking whether an overwrite of an skb data structure
  may occur, which allowed local users to cause a denial of service
  (system crash) via crafted system calls (bsc#1042892).
• CVE-2017-8890: The inet_csk_clone_lock function in
  net/ipv4/inet_connection_sock.c allowed attackers to cause a denial of
  service (double free) or possibly have unspecified other impact by
  leveraging use of the accept system call (bsc#1038564).