I will say, we've been deployed on Ubuntu 18.04 for 8 years now and tracking the CVEs against our configuration watching for potential exploits that could really matter to our systems, and it wasn't until the past few months that those exploits actually started to get meaningful ability to compromise us.
What that says to me is: the LLMs are finding meaningful vulnerabilities that "the best minds" missed for years and years. And they're also generating functional patches for these vulnerabilities far faster and more easily than the patches came out in the past.
I'm not loving the changed landscape, but I have to acknowledge that LLMs are making a significant difference.