Extreme has published Vulnerability Notices to provide information on two issues known as Meltdown
VN 2018-001 (CVE-2017-5715, CVE-2017-5753 - Spectre)
VN 2018-002 (CVE-2017-5754 - Meltdown)
At this time, susceptibility to each of these issues is actively being investigated and there isn't much content in either VN. We will continue to update them (and this topic) as more information becomes available.
You can read more about these two attacks on the CERT website: https://www.kb.cert.org/vuls/id/584653