CVE-2024-35791

Source
https://nvd.nist.gov/vuln/detail/CVE-2024-35791
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-35791.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2024-35791
Downstream
Related
Published
2024-05-17T13:15:58Z
Modified
2025-08-09T19:01:27Z
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved:

KVM: SVM: Flush pages under kvm->lock to fix UAF in svmregisterenc_region()

Do the cache flush of converted pages in svmregisterencregion() 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 _unregisterencregion_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.

References

Affected packages