| Package | Affected versions | Patched versions |
|---|---|---|
| xen | = 3.0.2= 3.0.3= 3.0.4= 3.1.2= 3.1.3= 3.1.4= 3.2.0= 3.2.1= 3.2.2= 3.2.3= 3.3.0= 3.3.1= 3.3.2= 3.4.0= 3.4.1= 3.4.2= 3.4.3= 4.0.0≤ 4.0.1 |
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.
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