Security researchers have found a new way to abuse the speculative execution mechanism of modern CPUs to break security boundaries and leak the contents of kernel memory. The new technique abuses a system instruction called SWAPGS and can bypass mitigations put in place for previous speculative execution vulnerabilities like Spectre. The vulnerability was discovered by researchers from security firm Bitdefender and was reported to Intel almost a year ago. The performance of the attack is not great; the researchers estimate that attackers could leak a few bytes every few minutes by using their proof-of-concept exploit.”]