Xen 3.3.x through 4.5.x and the Linux kernel through 3.19.1 do not properly restrict access to PCI command registers, which might allow local guest OS users to cause a denial of service (non-maskable interrupt and host crash) by disabling the (1) memory or (2) I/O decoding for a PCI Express device and then accessing the device, which triggers an Unsupported Request (UR) response.
| Software | From | Fixed in |
|---|---|---|
| ubuntu / ubuntu | 12.04 | 12.04.x |
| xen / xen | 4.1.5 | 4.1.5.x |
| xen / xen | 4.2.2 | 4.2.2.x |
| xen / xen | 4.2.3 | 4.2.3.x |
| xen / xen | 3.4.0 | 3.4.0.x |
| xen / xen | 4.3.0 | 4.3.0.x |
| xen / xen | 4.0.4 | 4.0.4.x |
| xen / xen | 4.0.2 | 4.0.2.x |
| xen / xen | 3.3.2 | 3.3.2.x |
| xen / xen | 4.1.2 | 4.1.2.x |
| xen / xen | 3.4.4 | 3.4.4.x |
| xen / xen | 4.0.0 | 4.0.0.x |
| xen / xen | 4.4.0-rc1 | 4.4.0-rc1.x |
| xen / xen | 4.1.1 | 4.1.1.x |
| xen / xen | 4.2.0 | 4.2.0.x |
| xen / xen | 4.1.0 | 4.1.0.x |
| xen / xen | 3.4.3 | 3.4.3.x |
| xen / xen | 4.4.1 | 4.4.1.x |
| xen / xen | 4.1.3 | 4.1.3.x |
| xen / xen | 4.1.6.1 | 4.1.6.1.x |
| xen / xen | 3.3.1 | 3.3.1.x |
| xen / xen | 3.4.2 | 3.4.2.x |
| xen / xen | 4.1.4 | 4.1.4.x |
| xen / xen | 3.4.1 | 3.4.1.x |
| xen / xen | 4.3.1 | 4.3.1.x |
| xen / xen | 3.3.0 | 3.3.0.x |
| xen / xen | 4.2.1 | 4.2.1.x |
| xen / xen | 4.5.0 | 4.5.0.x |
| xen / xen | 4.4.0 | 4.4.0.x |
| xen / xen | 4.0.1 | 4.0.1.x |
| xen / xen | 4.0.3 | 4.0.3.x |
| linux / linux_kernel | - | 3.19.1.x |