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vm86 Syscall Linux Root Privilege Escalation

vm86 Syscall Linux Root Privilege Escalation
Posted Jan 7, 2014
Authored by halfdog

The initial observation was, that the linux vm86 syscall, which allows to use the virtual-8086 mode from userspace for emulating of old 8086 software as done with dosemu, was prone to trigger FPU errors. Closer analysis showed, that in general, the handling of the FPU control register and unhandled FPU-exception could trigger CPU-exceptions at unexpected locations, also in ring-0 code. Proof of concept code included.

tags | exploit, proof of concept
systems | linux
MD5 | d51c172c2a52d41901fa4a885e01e0af

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