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A flaw was found in the KVM's AMD nested virtualization (SVM). A malicious L1 guest could purposely fail to intercept the shutdown of a cooperative nested guest (L2), possibly leading to a page fault and kernel panic in the host (L0).
Upstream patch: https://lore.kernel.org/lkml/20221020093055.224317-5-mlevitsk@redhat.com/T/
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 2136837]
Upstream commit: https://github.com/torvalds/linux/commit/ed129ec9057f89d615ba0c81a4984a90345a1684
This was fixed for Fedora with the 6.0.11 stable kernel updates.