The x86_emulate function in arch/x86/x86_emulate/x86_emulate.c in Xen 4.4.x and earlier does not properly check supervisor mode permissions, which allows local HVM users to cause a denial of service (guest crash) or gain guest kernel mode privileges via vectors involving an (1) HLT, (2) LGDT, (3) LIDT, or (4) LMSW instruction.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Xen | Xen | 3.2.0 | 3.2.0 |
| Xen | Xen | 4.1.5 | 4.1.5 |
| Xen | Xen | 3.2.1 | 3.2.1 |
| Xen | Xen | 4.2.2 | 4.2.2 |
| Xen | Xen | 4.2.3 | 4.2.3 |
| Xen | Xen | 3.0.4 | 3.0.4 |
| Xen | Xen | 3.4.0 | 3.4.0 |
| Xen | Xen | 4.3.0 | 4.3.0 |
| Xen | Xen | 4.0.4 | 4.0.4 |
| Xen | Xen | 4.0.2 | 4.0.2 |
| Xen | Xen | 3.3.2 | 3.3.2 |
| Xen | Xen | 4.1.2 | 4.1.2 |
| Xen | Xen | 3.2.2 | 3.2.2 |
| Xen | Xen | 3.4.4 | 3.4.4 |
| Xen | Xen | 4.0.0 | 4.0.0 |
| Xen | Xen | 4.4.0 | 4.4.0 |
| Xen | Xen | 4.1.1 | 4.1.1 |
| Xen | Xen | 4.2.0 | 4.2.0 |
| Xen | Xen | 4.1.0 | 4.1.0 |
| Xen | Xen | 3.4.3 | 3.4.3 |
| Xen | Xen | 3.0.3 | 3.0.3 |
| Xen | Xen | 4.1.3 | 4.1.3 |
| Xen | Xen | 3.2.3 | 3.2.3 |
| Xen | Xen | 4.1.6.1 | 4.1.6.1 |
| Xen | Xen | * | 4.4.0 |
| Xen | Xen | 3.3.1 | 3.3.1 |
| Xen | Xen | 3.0.2 | 3.0.2 |
| Xen | Xen | 3.4.2 | 3.4.2 |
| Xen | Xen | 4.1.4 | 4.1.4 |
| Xen | Xen | 3.4.1 | 3.4.1 |
| Xen | Xen | 3.1.4 | 3.1.4 |
| Xen | Xen | 4.3.1 | 4.3.1 |
| Xen | Xen | 3.3.0 | 3.3.0 |
| Xen | Xen | 4.2.1 | 4.2.1 |
| Xen | Xen | 3.1.3 | 3.1.3 |
| Xen | Xen | 4.4.0 | 4.4.0 |
| Xen | Xen | 4.0.1 | 4.0.1 |
| Xen | Xen | 4.0.3 | 4.0.3 |