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Use After Free The advisory has been revoked - it doesn't affect any version of package kernel-64k-debug-devel-matched  (opens in a new tab)

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EPSS
0.24% (15th percentile)

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  • Snyk IDSNYK-RHEL9-KERNEL64KDEBUGDEVELMATCHED-9443649
  • published15 Mar 2025
  • disclosed17 May 2024
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Introduced: 17 May 2024

CVE-2024-35791  (opens in a new tab)
CWE-416  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:9.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-64k-debug-devel-matched package and not the kernel-64k-debug-devel-matched package as distributed by RHEL.

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.