The p2m_pod_emergency_sweep function in arch/x86/mm/p2m-pod.c in Xen 3.4.x, 3.5.x, and 3.6.x is not preemptible, which allows local x86 HVM guest administrators to cause a denial of service (CPU consumption and possibly reboot) via crafted memory contents that triggers a time-consuming linear scan, related to Populate-on-Demand.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Xen | Xen | 3.4.0 (including) | 3.4.0 (including) |
| Xen | Xen | 3.4.1 (including) | 3.4.1 (including) |
| Xen | Xen | 3.4.2 (including) | 3.4.2 (including) |
| Xen | Xen | 3.4.3 (including) | 3.4.3 (including) |
| Xen | Xen | 3.4.4 (including) | 3.4.4 (including) |
| Xen | Ubuntu | devel | * |
| Xen | Ubuntu | precise | * |
| Xen | Ubuntu | trusty | * |
| Xen | Ubuntu | vivid | * |
| Xen | Ubuntu | wily | * |