A previously unknown type of attack, dubbed “Interrupt Injection,” has been discovered to bypass defenses against Spectre v2 vulnerabilities on both Intel and AMD CPUs. This finding is significant because it highlights a previously unexplored vector for attackers to access sensitive information in systems that thought they were secure.
The Interrupt Injection attack works by exploiting the way modern CPUs handle interrupts, which are signals sent to a processor to interrupt its current task and attend to another one. An attacker can manipulate these interrupts to inject malicious code into a system’s memory, effectively bypassing Spectre v2 defenses. This allows them to access sensitive data that would otherwise be protected.
Researchers have confirmed that this attack is successful against systems running Intel Core processors from the 7th generation onwards and AMD Ryzen CPUs from the first generation. It’s worth noting that this exploit leverages a previously unknown mechanism, rather than taking advantage of any specific vulnerability in the CPU architecture itself.
The implications of this discovery are far-reaching because they affect not just individual computers but also entire networks and cloud services. If an attacker can bypass Spectre v2 defenses on these systems, they can potentially access sensitive information that’s supposed to be protected by those very same defenses. This could include financial data, personal identifiable information, or confidential business communications.
One of the concerns surrounding this attack is its potential use in privilege escalation attacks. By injecting malicious code into a system’s memory, an attacker may be able to gain elevated privileges on the compromised machine. From there, they can map cross-domain connections and identify key choke points that allow them to sever breach routes.
The discovery of Interrupt Injection underscores the ongoing cat-and-mouse game between cybersecurity experts and attackers. As defenders develop new defenses against known vulnerabilities, attackers continually find ways to exploit previously unexplored weaknesses in systems. This finding highlights the need for continuous vigilance and the importance of staying up-to-date with the latest security patches and updates.
In practical terms, this discovery emphasizes the need for organizations to remain vigilant about patching their systems and regularly updating their security software. It’s also essential that users take steps to limit potential attack surfaces by configuring their systems securely and monitoring for suspicious activity. By taking these precautions, individuals can minimize their exposure to attacks like Interrupt Injection and maintain a more robust defense against evolving cyber threats.
Source: The Hacker News — 2026-08-06