Description
In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Free have_run_cpus during VM destruction even if VM is no longer SEV Unconditionally free SEV's "have run CPUs" cpumask in the VM destroy path, i.e. even for what appear to be non-SEV VMs, as an SEV VM becomes a non-SEV VM if its state is intra-host migrated. Alternatively, the mask could be freed in sev_migrate_from() when "converting" the source VM, but that gets annoying because ideally KVM would nullify the mask to guard against UAF, and nullifying the mask would need be conditioned on CPUMASK_OFFSTACK=y. Freeing the mask during sev_migrate_from() is also not robust against other KVM bugs, though that's kind of a moot point since any such bugs would show up even if sev->active is never set. I.e. KVM must get that side of things correct. But, that's not a great reason to add more code just to make things marginally less robust.
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
6f38f8c574642a822f2e85f079fa29a49176c49c to < 6aef7cf800098749ff5d660222efaf6e01e98c09affected6f38f8c574642a822f2e85f079fa29a49176c49c to < 9784e5ca91b37b387f3f414af4340c54f7a63566affected6f38f8c574642a822f2e85f079fa29a49176c49c to < 12c1f6e03f944e399bd2c88441dca5dc702b95a5affected
Linux Linux
Default version status: affected
6.17affected0 to < 6.17unaffected6.18.55 to ≤ 6.18.*unaffected7.2.9 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected