From RHEL extended maintenance policy, emphasis mine:
Under a Red Hat Enterprise Linux subscription, all available RHSAs and
RHBAs are provided for the current active minor release until the
availability of the next minor release. By contrast, EUS —for a
specific minor release—an independent, extended stream of those Red
Hat defined Critical and Importantix impact RHSAs and selected (at Red
Hat discretion) Urgent Priority RHBAs that are available after that
specific minor release and in parallel to subsequent minor releases.
See the list of packages included for RHEL 7 here. Please reference
the RHEL 8 and 9 EUS Support Maintenance Policy below.
Each Red Hat Enterprise Linux EUS stream is available for 24 months
from the availability of the minor release.
Pull up the KB article on release dates, noting that 7 is currently past the full support phase; 7.9 is the last minor version. 7.5 would be mid 2018. Meaning right now you are 5 years late in updating this system.
No, extended update support is not automatic. Even if you bought EUS, that's only 24 months, you still would several years out of date.
Get some help in improving your updating and servicing. RHEL is a general purpose operating system, it needs the minor feature updates to continue getting updates and support. On average the minor releases occur more than once a year, letting updates lapse for many years is negligence.
Do not think about this as updating RHEL 7.4 hosts. This is servicing RHEL 7. Anyone, third party, vendor, or otherwise, that implies you can stay on a minor RHEL version for years, does not understand how this distro is maintained.
