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

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Summary

CVECVE-2026-74607
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:33 UTC
Updated2026-08-22 16:16:33 UTC
DescriptionIn 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) between reading it and locking it. There is thus no way to perform the checks under the owner lock without putting struct kvm under SLAB_TYPESAFE_BY_RCU (which would allow kvm_get_kvm_safe() under RCU critical section). It is much simpler to just use a global lock, since the critical sections are so small and the new lock is always a leaf lock.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b2125513dfc0dd0ec5a9605138a3c356592cfb73 47976eaaf0a4eb46dade48b3246779090db9e3ec git Not specified
CNA Linux Linux affected b2125513dfc0dd0ec5a9605138a3c356592cfb73 d728baba0f20e49439fc7831bf3e4e7dee82161a git Not specified
CNA Linux Linux affected b2125513dfc0dd0ec5a9605138a3c356592cfb73 1d78d33275ef2a16c6d080910b291d0a97a0e613 git Not specified
CNA Linux Linux affected 5.18 Not specified
CNA Linux Linux unaffected 5.18 semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/47976eaaf0a4eb46dade48b3246779090db9e3ec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d728baba0f20e49439fc7831bf3e4e7dee82161a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1d78d33275ef2a16c6d080910b291d0a97a0e613 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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