CVE-2024-35791 (GCVE-0-2024-35791)
Vulnerability from cvelistv5
Published
2024-05-17 12:24
Modified
2026-05-23 15:43
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4f627ecde7329e476a077bb0590db8f27bb8f912
Version: 19a23da53932bc8011220bd8c410cb76012de004
Version: 19a23da53932bc8011220bd8c410cb76012de004
Version: 19a23da53932bc8011220bd8c410cb76012de004
Version: 19a23da53932bc8011220bd8c410cb76012de004
Version: 19a23da53932bc8011220bd8c410cb76012de004
Version: f1ecde00ce1694597f923f0d25f7a797c5243d99
Version: 848bcb0a1d96f67d075465667d3a1ad4af56311e
Version: 5.10.15   ≤
Version: 4.19.176   ≤
Version: 5.4.98   ≤
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