Oops! It's a kernel stack use-after-free: Exploiting NVIDIA's GPU Linux drivers - Quarkslab's blog
This article details two bugs discovered in the NVIDIA Linux Open GPU Kernel Modules and demonstrates how they can be exploited. The bugs can be triggered by an attacker controlling a local unprivileged process. Their security implications were confirmed via a proof of concept that achieves...
blog.quarkslab.com
This blog is almost a manifesto of modern exploitation.
In addition: tthey used the "standard of practice" (90day rule) as a weapon against a megacorp trying to bury bugs:
1. NVIDIA asked for 7.
2. Quarkslab said 90 + maybe 30 extension max.
3. NVIDIA tried to stall -> Quarkslab said nope + dropped on schedule.