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CVE-2026-46317 is a Linux kernel vulnerability in KVM on arm64 caused by unsafe reallocation and reassignment of the kvm->arch.nested_mmus[] array. The array is walked under kvm->mmu_lock, including from the MMU notifier path kvm_unmap_gfn_range() -> kvm_nested_s2_unmap(), which may execute asynchronously. However, kvm_vcpu_init_nested() could reallocate the nested_mmus array and free the old buffer while holding only kvm->arch.config_lock. This creates a race where concurrent walkers can dereference the freed array, resulting in a use-after-free condition. The fix allocates a replacement array outside mmu_lock, then under kvm->mmu_lock copies existing entries, repairs back pointers, and atomically reassigns the array, with the old buffer freed only after dropping the lock.
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Cross-references every affected SKU, including bundled OEM variants.
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