A group of academics from VUSec and Scuola Superiore Sant'Anna have disclosed details of a new Spectre CPU vulnerability variant that affects Just-In-Time (JIT) engines present in web browsers, language runtimes, and the operating system kernel, across multiple CPU vendors.

The new Spectre v2 variant has been codenamed Branch Target Reuse (BTR).

"The key insight is that, while modern CPUs