CVE-2026-72286: KVM: SEV: Do not allow intra-host migration/mirroring of SNP VMs
In the Linux kernel, the following vulnerability has been resolved:
KVM: SEV: Do not allow intra-host migration/mirroring of SNP VMs
The intra-host migration/mirroring feature is not fully implemented for SEV-SNP VMs. The proper migration requires additional SNP-specific state such as guestreqmutex, guestreqbuf, and guestrespbuf to be transferred or initialized on the destination.
The SNP VM mirroring requires vmsa features to be copied as well otherwise ASID would be bound to SNP range while VM is detected as a SEV VM.
Reject SNP source VMs in migration/mirroring until proper SNP state transfer is implemented.
[sean: let lines poke past 80 chars, tag for stable]
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Reject SEV-SNP source VMs from intra-host migration/mirroring until proper SEV-SNP state (e.g., vmsa features and SNP-specific state such as guest_req_mutex, guest_req_buf, and guest_resp_buf) is correctly transferred/initialized on the destination.
KVM (Linux kernel) SEV-SNP intra-host migration/mirroring for SEV-SNP VMs = reject SNP source VMs