CVE-2024-35791

CVE-2024-35791 · KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region()

Cette page présente des faits issus de sources publiques. Consultez l’avis original avant toute mise à jour.

Cette page présente une partie des faits des sources. Consultez les avis liés pour la description complète et les versions concernées.

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region() Do the cache flush of converted pages in svm_register_enc_region() before dropping kvm->lock to fix use-after-free issues where region and/or its array of pages could be freed by a different task, e.g. if userspace has __unregister_enc_region_locked() already queued up for the region. Note, the "obvious" alternative of using local variables doesn't fully resolve the bug, as region->pages is also dynamically allocated. I.e. the region structure itself would be fine, but region->pages could be freed. Flushing multiple pages under kvm->lock is unfortunate, but the entire flow is a rare slow path, and the manual flush is only needed on CPUs that lack coherency for encrypted memory.

CVSS 7.8 · Élevée · EPSS 0,2% · Correctif disponible

Publication

2024-05-17T12:24:49.520Z

Mise à jour

2026-08-05T11:29:57.222Z

Pile logicielle: system

Vérifiez votre serveur →