It is worth noting this Memory Tagging Extensions feature is a massive security improvement and has been planned for years in advance.

2021: https://nitter.net/GrapheneOS/status/135543282245507891 and 2022: https://nitter.net/GrapheneOS/status/1501158678455586817

Here is an explanation on how it works: https://source.android.com/docs/security/test/memory-safety/arm-mte - I'm not very knowledgeable on memory safety but overall it makes exploitation even harder than it already is.

GrapheneOS is shipping support for it while it is a disabled, unstable development feature in stock Android. In the meantime GrapheneOS want to work on improving beyond the standard implementation as well.

Will you need a Pixel 8 to get this benefit?