CVE-2026-20760 in Processors
Summary
by MITRE • 08/12/2026
Improper handling of overlap between protected memory ranges in some microcode for some Intel(R) Processors within Ring 0: Hypervisor may allow an escalation of privilege. Authorized adversary with a privileged user combined with a low complexity attack may enable escalation of privilege. This result may potentially occur via local access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.
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Analysis
by VulDB Data Team • 08/12/2026
This vulnerability represents a critical privilege escalation flaw in Intel processor microcode that operates at Ring 0 level within hypervisor environments. The issue stems from improper memory management when handling overlapping protected memory ranges, creating a fundamental gap in the processor's security model. Such vulnerabilities typically fall under CWE-129 or CWE-131 categories related to buffer overflow and memory management errors, where the system fails to properly validate memory boundaries during privilege transitions. The flaw specifically affects Intel processors that implement hypervisor virtualization features, making it particularly dangerous in cloud computing environments where multiple tenants share the same physical hardware.
The technical implementation of this vulnerability allows an authorized adversary with privileged user access to exploit a race condition or memory boundary violation that occurs during microcode execution. Attackers can leverage this weakness through local access methods without requiring user interaction or special external knowledge, making it particularly insidious since legitimate users already possess the necessary privileges to attempt exploitation. The low complexity attack vector combined with the elevated privilege requirements means that an attacker who already has access to a privileged account can potentially escalate their privileges to full system control. This type of vulnerability maps directly to ATT&CK technique T1068 which covers escalation of privileges through local exploit techniques.
The operational impact of this vulnerability extends across all three pillars of information security with high severity implications for confidentiality, integrity, and availability. When exploited successfully, the vulnerability can result in complete system compromise where the attacker gains unrestricted access to all system resources while simultaneously undermining the fundamental security guarantees that hypervisor environments are designed to provide. The potential for cascading effects means that a single compromised virtual machine could potentially allow attackers to escape to other VMs or even the host system itself. Organizations running Intel-based systems in virtualized environments face significant risk as this vulnerability can undermine the entire virtualization security model, potentially leading to data breaches, system corruption, and service disruptions.
Mitigation strategies should focus on immediate microcode updates from Intel along with comprehensive system hardening measures. System administrators must ensure that all processors receive the latest microcode patches while implementing additional monitoring for suspicious privilege escalation attempts. The vulnerability requires no user interaction or special knowledge to exploit, making proactive defense essential rather than reactive response. Organizations should also consider implementing additional layered security controls including hypervisor-level monitoring, privilege auditing, and network segmentation to limit the potential impact of successful exploitation. Regular vulnerability assessments and penetration testing should be conducted to identify any remaining exposure areas while maintaining awareness of related vulnerabilities that might compound this issue's impact on overall system security posture.