CVE-2024-35791: Debian Linux

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Debian Debian Linux: version 10.0 only
• Linux Linux Kernel: from 4.19.176, before 4.20 (fixed in 4.20); from 5.4.98, before 5.5 (fixed in 5.5); from 5.10.15, before 5.10.215 (fixed in 5.10.215); from 5.11.1, before 5.15.154 (fixed in 5.15.154); from 5.16, before 6.1.84 (fixed in 6.1.84); from 6.2, before 6.6.24 (fixed in 6.6.24); …

Published 2024-05-17. Last modified 2026-08-04.