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.

• linux linux kernel (>= 4.19.176 < 4.20) • linux linux kernel (>= 5.4.98 < 5.5) • 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 (>= 6.2 < 6.6.24) • linux linux kernel (>= 6.7 < 6.7.12) • linux linux kernel 5.11 • linux linux kernel 6.8 • debian debian linux 10.0