The x86_emulate function in arch/x86/x86_emulate/x86_emulate.c in Xen 3.3.x through 4.4.x does not check the supervisor mode permissions for instructions that generate software interrupts, which allows local HVM guest users to cause a denial of service (guest crash) via unspecified vectors.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Xen | Xen | 3.3.0 (including) | 3.3.0 (including) |
| Xen | Xen | 3.3.1 (including) | 3.3.1 (including) |
| Xen | Xen | 3.3.2 (including) | 3.3.2 (including) |
| Xen | Xen | 4.1.0 (including) | 4.1.0 (including) |
| Xen | Xen | 4.1.1 (including) | 4.1.1 (including) |
| Xen | Xen | 4.1.2 (including) | 4.1.2 (including) |
| Xen | Xen | 4.1.3 (including) | 4.1.3 (including) |
| Xen | Xen | 4.1.4 (including) | 4.1.4 (including) |
| Xen | Xen | 4.1.5 (including) | 4.1.5 (including) |
| Xen | Xen | 4.1.6.1 (including) | 4.1.6.1 (including) |
| Xen | Xen | 4.2.0 (including) | 4.2.0 (including) |
| Xen | Xen | 4.2.1 (including) | 4.2.1 (including) |
| Xen | Xen | 4.2.2 (including) | 4.2.2 (including) |
| Xen | Xen | 4.2.3 (including) | 4.2.3 (including) |
| Xen | Xen | 4.3.0 (including) | 4.3.0 (including) |
| Xen | Xen | 4.3.1 (including) | 4.3.1 (including) |
| Xen | Xen | 4.4.0 (including) | 4.4.0 (including) |
| Xen | Xen | 4.4.0-rc1 (including) | 4.4.0-rc1 (including) |
| Xen | Xen | 4.4.1 (including) | 4.4.1 (including) |
| Xen | Ubuntu | devel | * |
| Xen | Ubuntu | precise | * |
| Xen | Ubuntu | trusty | * |
| Xen | Ubuntu | utopic | * |
| Xen | Ubuntu | vivid | * |
| Xen-3.3 | Ubuntu | lucid | * |
| Xen-3.3 | Ubuntu | upstream | * |