CVE-2024-35791

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

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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 · Hoch · EPSS 0,2% · Korrektur verfügbar

Veröffentlicht

2024-05-17T12:24:49.520Z

Aktualisiert

2026-08-05T11:29:57.222Z

Technologie-Stack: system

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