Cloud isolation fails in six distinct ways, and a new scoring system rates defenses.

Cloud computing lets different people share the same physical computers. To keep data safe, systems run software inside virtual boundaries called virtual machines and containers, which act like separate digital boxes. But these boundaries can break. Researchers studied over 120 security papers published between 2008 and 2025 to see how attackers break out. They looked at threats like virtual machine escapes, container breakouts, and hidden CPU side channels. They discovered that protecting these systems is tricky because stronger defenses usually slow computers down. The authors built a scoring system to grade defenses on their accuracy, setup ease, performance impact, and daily operational overhead. They also mapped attack severity and pointed out open challenges, like building realistic test datasets and creating intrusion detection tools that do not cause heavy slowdowns.

Why it matters

Anyone using cloud services shares hardware with strangers. This paper catalogues how that sharing can leak data or crash systems, and introduces a way to compare defenses by accuracy, ease, performance cost, and overhead. It shows that stronger security often slows things down, and points to unsolved problems like detecting intrusions without bogging down the system.

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