Tracker / CVE-2024-35791
CVE-2024-35791
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 and versions
| debian | debian_linux |
|---|---|
| linux | linux_kernel |
| linux | linux_kernel · 4.19.176 → 4.20 |
| linux | linux_kernel · 5.10.15 → 5.10.215 |
| linux | linux_kernel · 5.11.1 → 5.15.154 |
| linux | linux_kernel · 5.16 → 6.1.84 |
| linux | linux_kernel · 5.4.98 → 5.5 |
| linux | linux_kernel · 6.2 → 6.6.24 |
| linux | linux_kernel · 6.7 → 6.7.12 |