Xen, when running on a 64-bit hypervisor, allows local x86 guest OS users to modify arbitrary memory and consequently obtain sensitive information, cause a denial of service (host crash), or execute arbitrary code on the host by leveraging broken emulation of bit test instructions.
| Software | From | Fixed in |
|---|---|---|
| xen / xen | - | - |
| citrix / xenserver | 7.0 | 7.0.x |
| citrix / xenserver | 6.5 | 6.5.x |
| citrix / xenserver | 6.0.2 | 6.0.2.x |
| citrix / xenserver | 6.2.0 | 6.2.0.x |