CVE-2026-74607

Technical Description

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

KVM: SVM: Serialize accesses to the owner and mirror list with separate lock

Interaction between KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM and

KVM_CAP_VM_COPY_ENC_CONTEXT_FROM can cause two separate issues:

- in sev_migrate_from(), when the destination KVM is a mirror, the mirror

entry is moved from the source's list to the owner's mirror_vms list,

without holding the owner's lock unlike other writers of the owner's

mirror list (sev_vm_copy_enc_context_from(), sev_vm_destroy()).

A concurrent COPY or destroy can race with sev_migrate_from() and

corrupt the list.

- In sev_vm_destroy(), the *owner* is still active and could receive

concurrently a KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM that causes

sev->enc_context_owner to change. In this case the incorrect VM

receives kvm_put_kvm().

The second issue needs particular care because the owner could disappear

altogether (even though the race window is impossibly small)

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References