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CVE-2026-74607

Vulnérabilité élevée dans Linux (Linux)

CVSS 8.8 · Élevée
EPSS 0.1%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, 5.18, 0, <=7.1.*, <5.18, <1d78d33275ef2a16c6d080910b291d0a97a0e613, <=6.6.*, 7.1.9, <28afde1edbd8b20058cbf4d75fb57876471ec334, <=6.18.*, 6.1.184, <d728baba0f20e49439fc7831bf3e4e7dee82161a, 6.18.45, <=*, 6.6.153, <328ab4fabe05af004d886659f8744076e320ddce, 6.12.105, b2125513dfc0dd0ec5a9605138a3c356592cfb73, <7943ec3a6d0e7e0a2eb4943300bce089ac3e8c3e, 7.2, <47976eaaf0a4eb46dade48b3246779090db9e3ec

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.

Gravité et risque d'exploitation

CVE-2026-74607 obtient un score CVSS de 8.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.13 %, ce qui la place devant 2.3 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 5.18, 0, <=7.1.*, <5.18, <1d78d33275ef2a16c6d080910b291d0a97a0e613, <=6.6.*, 7.1.9, <28afde1edbd8b20058cbf4d75fb57876471ec334, <=6.18.*, 6.1.184, <d728baba0f20e49439fc7831bf3e4e7dee82161a, 6.18.45, <=*, 6.6.153, <328ab4fabe05af004d886659f8744076e320ddce, 6.12.105, b2125513dfc0dd0ec5a9605138a3c356592cfb73, <7943ec3a6d0e7e0a2eb4943300bce089ac3e8c3e, 7.2, <47976eaaf0a4eb46dade48b3246779090db9e3ec) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

Rechercher une autre CVE