Bug 2516683 (CVE-2026-72286)

Summary: CVE-2026-72286 kernel: KVM: SEV: Do not allow intra-host migration/mirroring of SNP VMs
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) with Secure Encrypted Virtualization (SEV) and Secure Nested Paging (SNP) virtual machines. The intra-host migration and mirroring feature is not fully implemented for SEV-SNP VMs. This incomplete implementation means that critical SNP-specific security state is not properly transferred or initialized during these operations. Consequently, allowing such operations could lead to a bypass of the intended security protections for the virtual machine, potentially compromising its integrity or confidentiality.
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Description OSIDB Bzimport 2026-08-15 06:25:39 UTC 
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 guest_req_mutex, guest_req_buf, and guest_resp_buf 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]
Comment 1 Keith Grant 2026-08-18 19:03:18 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081559-CVE-2026-72286-6e63@gregkh/T