CVE-2026-79611

For XSA-308 logic was introduced, as VMX VMEntry checks do not like the
exact combination of state which occurs when #DB in intercepted, Single
Stepping is active, and blocked by STI/MovSS is active, despite this being
a legitimate state to be in.  The resulting VMEntry failure is fatal to
the guest.

Sadly there is another special sub-case of the above, with branch tracing
enabled.  In that case the prior adjustment would still cause a VMentry
failure, as before fatal to the guest.