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Zapscape (CVE-2026-64561) is a KVM/x86 use-after-free in shadow MMU emulation letting a guest escape to host kernel root. Hyunwoo Kim reported it; the PoC targets AMD and covers Linux commits f95eec9bed76 to 2abd5287f083. On Intel, triggering requires EPT page walk lengths 4 and 5 exposed to L1.
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