Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b56639318bb2be66aceba92836279714488709b4 before 37dfb676fafd1eef36fe0bb649607afbb0d5521b; affected b56639318bb2be66aceba92836279714488709b4 before d4cc2dff12116a700add601c0262132cc26e1b2c; affected b56639318bb2be66aceba92836279714488709b4 before 93de2a6a4b91b72607136dd656edf03fb399d27f |
| Linux / Linux | affected 5.16; unaffected 0 before 5.16; unaffected 6.18.55 through 6.18.*; unaffected 7.2.9 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.