The FreeBSD Security Team have issued a notice regarding the Meltdown and Spectre vulnerability, known to affect many Intel systems around the world. A fix is in progress and will be announced soon.You may view the report from various websites below.

By now, we're sure most everyone have heard of the Meltdown and Spectre
attacks. If not, head over to https://meltdownattack.com/ and get an
overview. Additional technical details are available from Google
Project Zero.
https://googleprojectzero.blogspot.com/2018/01/reading-privileged-memory-with-side.html

The FreeBSD Security Team was notified of the issue in late December
and received a briefing under NDA with the original embargo date of
January 9th. Since we received relatively late notice of the issue, our
ability to provide fixes is delayed.

Original announcement: https://lists.freebsd.org/pipermail/freebsd-security/2018-January/009719.html

FreeBSD Patches for Meltdown and Spectre Coming

Official FreeBSD Security Officer Response to Meltdown and Spectre, outlook on timeline for patches from freebsd

FreeBSD developers posted they were notified about the Meltdown and Spectre attacks in late December. They are currently still figuring out their plans for fending off these possible attacks and have no estimates yet when patches may be available.

Phoronix: https://www.phoronix.com/scan.php?page=news_item&px=BSD-Spectre-Response

NVIDIA FreeBSD driver patch: http://www.hackbusters.com/news/stories/2470639-nvidia-releases-meltdown-and-spectre-updates