The fixup_page_fault function in arch/x86/traps.c in Xen 4.0.1 and earlier on 64-bit platforms, when paravirtualization is enabled, does not verify that kernel mode is used to call the handle_gdt_ldt_mapping_fault function, which allows guest OS users to cause a denial of service (host OS BUG_ON) via a crafted memory access.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Xen | Citrix | * | 4.0.1 (including) |
| Xen | Citrix | 3.0.2 (including) | 3.0.2 (including) |
| Xen | Citrix | 3.0.3 (including) | 3.0.3 (including) |
| Xen | Citrix | 3.0.4 (including) | 3.0.4 (including) |
| Xen | Citrix | 3.1.2 (including) | 3.1.2 (including) |
| Xen | Citrix | 3.1.3 (including) | 3.1.3 (including) |
| Xen | Citrix | 3.1.4 (including) | 3.1.4 (including) |
| Xen | Citrix | 3.2.0 (including) | 3.2.0 (including) |
| Xen | Citrix | 3.2.1 (including) | 3.2.1 (including) |
| Xen | Citrix | 3.2.2 (including) | 3.2.2 (including) |
| Xen | Citrix | 3.2.3 (including) | 3.2.3 (including) |
| Xen | Citrix | 3.3.0 (including) | 3.3.0 (including) |
| Xen | Citrix | 3.3.1 (including) | 3.3.1 (including) |
| Xen | Citrix | 3.3.2 (including) | 3.3.2 (including) |
| Xen | Citrix | 3.4.0 (including) | 3.4.0 (including) |
| Xen | Citrix | 3.4.1 (including) | 3.4.1 (including) |
| Xen | Citrix | 3.4.2 (including) | 3.4.2 (including) |
| Xen | Citrix | 3.4.3 (including) | 3.4.3 (including) |
| Xen | Citrix | 4.0.0 (including) | 4.0.0 (including) |
| Red Hat Enterprise Linux 5 | RedHat | kernel-0:2.6.18-238.el5 | * |
| Xen | Ubuntu | dapper | * |
| Xen | Ubuntu | upstream | * |
| Xen-3.1 | Ubuntu | hardy | * |
| Xen-3.2 | Ubuntu | hardy | * |
| Xen-3.3 | Ubuntu | karmic | * |
| Xen-3.3 | Ubuntu | lucid | * |
| Xen-3.3 | Ubuntu | maverick | * |
| Xen-3.3 | Ubuntu | natty | * |