"only affects 64 bit x86 systems"
Can you even buy a 32bit system any more? Even if you could, what use would a VM host be if you couldn't address more than 4GB of memory (without workarounds)?
Qubes is once again regretting how long it's taken to abandon Xen's PV hypervisor, disclosing another three bugs including host escape vulnerabilities. The most serious bugs are in PV (paravirtualization) memory handling, XSA-213 and XSA-214. “An attacker who exploits either of these bugs can break Qubes-provided isolation. …
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