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CVE PROGRAM SOURCE RECORD8.8 High

CVE-2026-74607

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

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Status
Published
Published
Updated
Assigning organization
Linux

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) 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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • b2125513dfc0dd0ec5a9605138a3c356592cfb73 to < 7943ec3a6d0e7e0a2eb4943300bce089ac3e8c3eaffected
  • b2125513dfc0dd0ec5a9605138a3c356592cfb73 to < 28afde1edbd8b20058cbf4d75fb57876471ec334affected
  • b2125513dfc0dd0ec5a9605138a3c356592cfb73 to < 328ab4fabe05af004d886659f8744076e320ddceaffected
  • b2125513dfc0dd0ec5a9605138a3c356592cfb73 to < 47976eaaf0a4eb46dade48b3246779090db9e3ecaffected
  • b2125513dfc0dd0ec5a9605138a3c356592cfb73 to < d728baba0f20e49439fc7831bf3e4e7dee82161aaffected
  • b2125513dfc0dd0ec5a9605138a3c356592cfb73 to < 1d78d33275ef2a16c6d080910b291d0a97a0e613affected

Linux Linux

Default version status: affected

  • 5.18affected
  • 0 to < 5.18unaffected
  • 6.1.184 to ≤ 6.1.*unaffected
  • 6.6.153 to ≤ 6.6.*unaffected
  • 6.12.105 to ≤ 6.12.*unaffected
  • 6.18.45 to ≤ 6.18.*unaffected
  • 7.1.9 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References