It is unsupported to upgrade or make changes to the Ubuntu operating system on NSX manager or edge nodes. Security vulnerabilities found on NSX manager or edge nodes must be addressed by an update or recommendation from Broadcom.
All security advisories for VCF software can be found at Security Advisories - VMware Cloud Foundation. From this page, products can be filtered to locate advisories specific to NSX.
If specific vulnerabilities are discovered (CVEs), search the knowledge base for the CVE number to determine if NSX is affected.
If it is unclear if NSX is affected, open a case with Broadcom support. For more information, see Creating and managing Broadcom support cases.