CVE-2021-28706

guests may exceed their designated memory limit When a guest is permitted
to have close to 16TiB of memory, it may be able to issue hypercalls to
increase its memory allocation beyond the administrator established limit.
This is a result of a calculation done with 32-bit precision, which may
overflow. It would then only be the overflowed (and hence small) number
which gets compared against the established upper bound.

Notes