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Description of problem:
The same issue with 1684127. Check CI job, since kernel-rt-4.18.0-182.rt13.40.el8, kernel-rt use the Test Certficate:
Use the pesign command to verify the RH certificate.
---------------------------------------------
certificate address is 0x7ff4f61f5978
Content was not encrypted.
Content is detached; signature cannot be verified.
The signer's common name is Red Hat Test Certificate
No signer email address.
Signing time: Sat Feb 22, 2020
There were certs or crls included.
---------------------------------------------
No Red Hat Secure Boot key, may is Red Hat Test Certificate:

The latest kernel kernel-rt-4.18.0-183.rt13.41.el8 also use the test certificate.

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. pesign -v -S -i /boot/vmlinuz-$(uname -r)
2.
3.

Actual results:


Expected results:


Additional info:

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:1567