hypnosec (2231454) writes "A security researcher is claiming to have defeated Microsoft Windows RT’s Code Integrity Mechanism thereby jailbreaking the ARM-based tablet to run desktop applications. C. L. Rokr has revealed that the vulnerability that allowed for the jailbreak is present in the Windows Kernel that found its way into the ARM port as well. “Ironically, a vulnerability in the Windows kernel that has existed for some time and got ported to ARM just like the rest of Windows made this possible”, Rokr wrote in a blog post. The vulnerability can be exploited through memory manipulation and it was possible after the researcher stumbled upon a “byte that represents the minimum signing level.” Once the vulnerability is exploited the Windows RT tablet allowed for execution of ARM compiled desktop apps. The jailbreak will only work with ARM based applications and x86 apps can’t be executed."
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