CVE-2026-46317

In the Linux kernel, the following vulnerability has been resolved:

KVM: arm64: Reassign nested_mmus array behind mmu_lock

kvm->arch.nested_mmus[] is walked under kvm->mmu_lock, including from the

MMU notifier path (kvm_unmap_gfn_range() -> kvm_nested_s2_unmap()), which

can run at any time. kvm_vcpu_init_nested() reallocates the array and frees

the old buffer while holding only kvm->arch.config_lock, so such a walker

can reference the freed array.

Allocate the new array outside of mmu_lock, as the allocation can sleep.

Under the lock, copy the existing entries, fix up the back pointers and

reassign the array. Free the old buffer after dropping the lock, as

kvfree() can sleep as well.