It's called a "patch gap" and describes the time it takes a fix for a known vulnerability to trickle down from software vendor to individual device manufacturers. And the latest casualties are the millions of Pixel, Samsung, Xiaomi, and other Android device brands.
According to Google's Project Zero, after its team discovered five separate bugs in the
ARM Mali GPU driver, ARM "promptly" issued a patch in July and August. Yet, Project Zero reported that every test device they looked at this week remains vulnerable. Until there's a better solution for tightening up the lag between the time a patch is issued and reaches the wider ecosystem, it's up to security teams to remain "vigilant," the Google Project Zero team advised.