CVE-2026-20731 in NPU Driver
Summary
by MITRE • 08/11/2026
Improper buffer restrictions for the Intel(R) NPU Driver for all versions within Ring 3: User Applications may allow a denial of service. Unprivileged software adversary with an authenticated user combined with a low complexity attack may enable denial of service. 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 (none), integrity (low) 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 • 08/11/2026
This vulnerability represents a critical buffer overflow flaw within the Intel NPU Driver component that operates at Ring 3 level, specifically affecting user applications rather than kernel-level processes. The issue stems from inadequate input validation and boundary checking mechanisms implemented in the driver's user-space components, creating an exploitable condition where unprivileged adversaries can manipulate memory allocation patterns through crafted inputs or operations. The vulnerability manifests as a denial of service condition that can be triggered by authenticated users with minimal attack complexity requirements, making it particularly concerning for environments where multiple users share system resources.
The technical nature of this flaw places it firmly within the CWE-121 buffer overflow category, specifically manifesting as an improper restriction of operations within a bounded buffer scenario. Attackers leveraging this vulnerability can potentially cause system instability through memory corruption or resource exhaustion, leading to complete system service interruption without requiring elevated privileges. The attack surface is significantly expanded by the local access requirements being minimal and not dependent on special internal knowledge, while also eliminating the need for user interaction during exploitation phases. This characteristic aligns with ATT&CK technique T1499.004 which focuses on network disruption through service availability attacks.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it can compromise system reliability and availability in production environments where Intel NPU functionality is critical for performance acceleration. The high availability impact rating indicates that successful exploitation could render the system completely unusable or require complete system restarts to restore normal operations. While the confidentiality impact remains at none, indicating no data leakage occurs directly from this vulnerability, the integrity impact of low severity suggests potential modification of system states or memory contents during exploitation attempts. The cascading effects on system integrity and availability can create secondary impacts that extend well beyond the immediate driver component.
Mitigation strategies should prioritize immediate patch deployment from Intel's official sources, as well as implementing application whitelisting controls to restrict execution of potentially malicious software within the user environment. System administrators should consider disabling unnecessary NPU functionality when not required for specific workloads, while monitoring for anomalous memory allocation patterns that could indicate exploitation attempts. The vulnerability's characteristics make it particularly susceptible to automated exploitation techniques, therefore network-based detection systems should be configured to monitor for unusual buffer operation patterns or memory access violations within the NPU driver contexts. Additionally, implementing proper privilege separation mechanisms and runtime application control can significantly reduce the attack surface available to adversaries attempting to leverage this specific weakness.