IBPB may not prevent return branch predictions from being specified by pre-IBPB branch targets leading to a potential information disclosure.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Xen | Xen | - (including) | - (including) |
| Xen | Ubuntu | bionic | * |
| Xen | Ubuntu | kinetic | * |
| Xen | Ubuntu | lunar | * |
| Xen | Ubuntu | mantic | * |
| Xen | Ubuntu | trusty | * |
| Xen | Ubuntu | xenial | * |