Which vulnerability family is associated with speculative execution across processor architectures?

Which vulnerability family is associated with speculative execution across processor architectures?

• A. Meltdown Vulnerability
• B. Rowhammer
• C. Spectre Vulnerability
• D. Side-channel Attack

Answer: (C)

Speculative execution vulnerabilities hinge on how modern CPUs guess which instructions to run before it’s known whether those instructions are allowed, and then use the resulting transient state to reveal data through timing differences in caches. The Spectre family specifically targets these speculative paths to leak sensitive information across protection boundaries, and it appears across multiple processor architectures (Intel, AMD, ARM) because branch prediction and speculative execution are common features in many CPUs. Meltdown also involves speculative execution but is more about bypassing memory isolation to read privileged memory, and it is more architecture-specific. Rowhammer is a hardware memory fault phenomenon, not tied to speculative execution, and side-channel attacks describe the general technique rather than this particular vulnerability family. Therefore, Spectre is the correct association.

Speculative execution vulnerabilities hinge on how modern CPUs guess which instructions to run before it’s known whether those instructions are allowed, and then use the resulting transient state to reveal data through timing differences in caches. The Spectre family specifically targets these speculative paths to leak sensitive information across protection boundaries, and it appears across multiple processor architectures (Intel, AMD, ARM) because branch prediction and speculative execution are common features in many CPUs.

Meltdown also involves speculative execution but is more about bypassing memory isolation to read privileged memory, and it is more architecture-specific. Rowhammer is a hardware memory fault phenomenon, not tied to speculative execution, and side-channel attacks describe the general technique rather than this particular vulnerability family. Therefore, Spectre is the correct association.