CVE-2026-64508

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

A new variant of the Spectre-v2 CPU vulnerability, termed Branch Target Reuse (BTR), has been reported by researchers. This attack reportedly enables the leakage of sensitive memory from Linux systems, even those equipped with existing Spectre-v2 mitigations. The vulnerability is said to specifically target Just-In-Time (JIT) engines, which are commonly found in web browsers, various runtimes,…