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CVE-2026-63807 is a flaw in the Linux kernel's KVM x86 shadow MMU hugepage recovery logic. The bug occurs because KVM queries the maximum mapping level for a shadow page's guest frame number before first verifying that the hugepage base guest frame number is actually contained within the target memslot. In the affected path, a guest can create a hugepage mapping whose range extends below the bounds of a memslot. KVM may then create a direct shadow page whose guest frame number lies outside the memslot even though the leaf reverse-mapping entry remains in bounds. During hugepage recovery, the kernel subsequently uses that out-of-bounds guest frame number when consulting memslot large-page metadata, leading to an out-of-bounds access to lpage_info. In typical cases this manifests as a host kernel page fault in kvm_mmu_max_mapping_level().
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Cross-references every affected SKU, including bundled OEM variants.
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