The pair disclosed to AMD and Intel on February 5. AMD published a bulletin on August 6, AMD-SB-7061, titled "Safe RET Interrupt Vulnerability," naming Zen 1 through Zen 4 processors as affected. The bulletin credits Trujillo and says the behavior was demonstrated on Zen 1 and Zen 2, with Zen 3 and Zen 4 suggested but not demonstrated. According to the paper the researchers shared with The Hacker News, Intel does not consider a mitigation necessary. Intel has not observed a real-world end-to-end attack on Intel processors and does not plan to add any additional mitigation guidance at this time.