| Package | Affected versions | Patched versions |
|---|---|---|
| xenserver | = 5.0= 5.5= 5.6= 6.0≤ 6.0.2 |
The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix XenServer 6.0.2 and earlier uses the return value of the get_free_pirq function as an array index without checking that the return value indicates an error, which allows guest OS users to cause a denial of service (invalid memory write and host crash) and possibly gain privileges via unspecified vectors.
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