A while back, Android announced a change to how they released security updates (#1217284):
Google recently made incredibly misguided changes to Android security updates. Android security patches are almost entirely quarterly instead of monthly to make it easier for OEMs. They're giving OEMs 3-4 months of early access which we know for a fact is being widely leaked including to attackers.
GrapheneOS developers then said they were able to get advanced access to these security patches so they could work on porting them to Graphene...but they also said they wouldn't be able to do this work in a public repository.
I'm pretty sure this means Graphene security patches become not-open-source until about 3-4 months after they actually release them (correct me if I'm misunderstanding this).
When I did my most reception system update on my phone, I got this notification:
checked = chance of malicious code or new vulns in security patches < chance of vuln being exploited
true
, but both are non-zero.