New Spectre-v2 BTR Attack Leaks Linux Memory Despite Existing Defenses

Academics have disclosed a new Spectre-v2 variant codenamed Branch Target Reuse (BTR). The flaw impacts Just-In-Time (JIT) engines across web browsers, language runtimes, and operating system kernels on multiple CPU vendors. This variant bypasses existing mitigations, successfully leaking memory despite current hardware and software defenses.