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The title sounds like its a vulnerability that allows a random process access to qemu memory but it is not.

Its a 2021 tutorial that describes how to configure qemu to share memory between a host process and a qemu machine through /dev/shm.

Yes every hypervisor has this "feature" unless it uses CPU features to protect memory, such as encrypted VM memory available on newer AMD CPUs (SEV) : https://www.qemu.org/docs/master/system/i386/amd-memory-encr...