VMFUNC emulation in Xen 4.6.x through 4.8.x on x86 systems using AMD virtualization extensions (aka SVM) allows local HVM guest OS users to cause a denial of service (hypervisor crash) by leveraging a missing NULL pointer check.
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Xen | Xen | 4.6.0 (including) | 4.6.0 (including) |
| Xen | Xen | 4.6.1 (including) | 4.6.1 (including) |
| Xen | Xen | 4.6.3 (including) | 4.6.3 (including) |
| Xen | Xen | 4.6.4 (including) | 4.6.4 (including) |
| Xen | Xen | 4.7.0 (including) | 4.7.0 (including) |
| Xen | Xen | 4.7.1 (including) | 4.7.1 (including) |
| Xen | Xen | 4.8.0 (including) | 4.8.0 (including) |
| Xen | Ubuntu | devel | * |
| Xen | Ubuntu | xenial | * |
| Xen | Ubuntu | yakkety | * |
| Xen | Ubuntu | zesty | * |