And there is the track record:
https://security-tracker.debian.org/tracker/source-package/s...
https://security-tracker.debian.org/tracker/source-package/s...
[0] https://security-tracker.debian.org/tracker/source-package/o...
Systemd has 4 open CvEs in ~1M lines of code.
The linux kernel hash 18 open CvEs in ~30M lines of code.