This kernel update is based on the upstream 4.14.104 and fixes at least the following security issue:
Linux Linux kernel version at least v4.8 onwards, probably well before contains a Insufficient input validation vulnerability in bnx2x network card driver that can result in DoS: Network card firmware assertion takes card off-line. This attack appear to be exploitable via An attacker on a must pass a very large, specially crafted packet to the bnx2x card. This can be done from an untrusted guest VM (CVE-2018-1000026).
It also fixes signal handling issues causing powertop to crash and some tracing tools to fail on execve tests.
For other uptstream fixes in this update, see the referenced changelogs.