Description
In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Do cache maintenance on the source VM during intra-host migration Manually perform cache maintenance on the source VM during intra-host migration to ensure no stale data is left in CPU caches after the VM is destroyed. Because the source VM is "converted" to a non-SEV VM, KVM's memory reclaim flows won't trigger cache maintenance, e.g. when all guest memory is reclaimed in response to detaching from the mmu_notifier. Note, relying on the destination VM to do cache maintenance isn't an option as KVM doesn't require identical guest memory configurations, i.e. the source VM may have access to memory that the destination VM does not. Enforcing equivalent memory configurations is infeasible, as it would require a *deep* comparison of memslots, e.g. to verify that not only are the memslot identical, but what the memslots point at is also identical.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
b56639318bb2be66aceba92836279714488709b4 to < 37dfb676fafd1eef36fe0bb649607afbb0d5521baffectedb56639318bb2be66aceba92836279714488709b4 to < d4cc2dff12116a700add601c0262132cc26e1b2caffectedb56639318bb2be66aceba92836279714488709b4 to < 93de2a6a4b91b72607136dd656edf03fb399d27faffected
Linux Linux
Default version status: affected
5.16affected0 to < 5.16unaffected6.18.55 to ≤ 6.18.*unaffected7.2.9 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected