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by Qualadore 1405 days ago
> then get local root

With Qubes you already by default have local root [0], because LPE is usually almost a forgone conclusion if the attacker has a sandbox escape.

> A Xen 0day, alone, isn't useful.

I don't think there any attackers with the interest and capability to acquire a Xen sandbox escape that wouldn't readily have access to browser 0-days, unless the target is using something like Tor Browser Bundle with JS, SVG, and PDF.js disabled.

[0] https://www.qubes-os.org/doc/vm-sudo/