The x86 emulator in KVM 83, when a guest is configured for Symmetric
Multiprocessing (SMP), does not properly restrict writing of segment
selectors to segment registers, which might allow guest OS users to
cause a denial of service (guest OS crash) or gain privileges on the
guest OS by leveraging access to a (1) IO port or (2) MMIO region, and
replacing an instruction in between emulator entry and instruction
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disclosed, or updated in CVE.
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