CVE-2026-20731: Intel NPU Driver DoS Vulnerability

CVE-2026-20731 Overview

CVE-2026-20731 is an improper buffer restriction vulnerability [CWE-119] affecting all versions of the Intel(R) Neural Processing Unit (NPU) Driver in Ring 3: User Applications. The flaw allows an authenticated local user to trigger a denial of service condition against the affected system. The vulnerability requires local access and low attack complexity, but does not require user interaction or special internal knowledge. Intel disclosed the issue in security advisory SA-01456.

Critical Impact
An authenticated local attacker can exploit improper buffer restrictions in the Intel NPU Driver to cause high availability impact, resulting in denial of service of the affected system.

Affected Products

Intel(R) NPU Driver — all versions
Systems running user-mode components of the Intel NPU stack (Ring 3)
Platforms integrating Intel NPU hardware acceleration

Discovery Timeline

2026-08-11 - CVE-2026-20731 published to NVD
2026-08-12 - Last updated in NVD database

Technical Details for CVE-2026-20731

Vulnerability Analysis

The vulnerability originates in the Intel NPU Driver's handling of buffers accessible from Ring 3 user applications. Improper buffer restrictions [CWE-119] permit operations to occur outside the intended memory bounds when user-space code interacts with the driver. An authenticated local user running unprivileged software can trigger the condition through the driver's user-mode interface.

Successful exploitation impacts integrity at a low level and availability at a high level, without disclosing confidential data. The primary observed outcome is a denial of service against the affected system, which may manifest as a driver crash, NPU subsystem hang, or system instability. The impact does not extend to subsequent systems, indicating the fault is contained to the local host.

Root Cause

The root cause is the driver's failure to properly restrict operations within the bounds of a memory buffer accessible from user mode. When a user application submits input the driver processes without enforcing correct size or boundary checks, memory outside the intended buffer region can be read or written. This class of weakness is tracked as CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer.

Attack Vector

Exploitation requires local access with an authenticated user account and low privileges. The attacker runs unprivileged software that interfaces with the Intel NPU Driver from user space. No user interaction is required, and the attacker does not need special internal knowledge of the driver. The attack complexity is low, meaning no specialized conditions must be met to trigger the vulnerable code path.

No public proof-of-concept exploit is available at this time, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. The EPSS estimate places the near-term exploitation probability at a low level. Technical specifics are documented in the Intel Security Advisory SA-01456.

Detection Methods for CVE-2026-20731

Indicators of Compromise

Unexpected crashes or hangs of the Intel NPU Driver or associated user-mode runtime processes.
Windows Event Log or kernel log entries referencing Intel NPU components generating faults or bug checks.
Repeated abnormal termination of user applications interfacing with the NPU device.
Sudden loss of NPU availability for legitimate AI/ML workloads on the host.

Detection Strategies

Monitor endpoint telemetry for unprivileged processes making unusual or repeated ioctl-style calls to the Intel NPU Driver interface.
Correlate driver fault events with process execution history to identify the invoking user-space binary.
Baseline normal NPU driver behavior and alert on deviations such as crash loops or excessive buffer submissions.

Monitoring Recommendations

Enable kernel crash dump collection and forward driver fault events to a centralized log platform.
Track Intel NPU Driver version inventory across the fleet to identify hosts pending patch deployment.
Alert on new or unsigned user-space binaries that begin interacting with the NPU driver interface.

How to Mitigate CVE-2026-20731

Immediate Actions Required

Review the Intel Security Advisory SA-01456 for the fixed driver version and apply it across affected systems.
Inventory all endpoints and workstations running the Intel NPU Driver to scope patch deployment.
Restrict local logon rights on systems with the vulnerable driver to reduce the population of potential attackers.

Patch Information

Intel has published guidance in security advisory SA-01456. Administrators should update the Intel(R) NPU Driver to the fixed version identified by Intel and validate deployment through driver version reporting on managed endpoints. Refer to the Intel Security Advisory SA-01456 for the specific fixed release.

Workarounds

Where the NPU is not required, disable the Intel NPU device in system firmware or the operating system until the updated driver is deployed.
Enforce application allow-listing to prevent untrusted unprivileged software from interacting with the NPU driver interface.
Limit local interactive and remote desktop access to trusted administrators on systems that cannot be patched immediately.

bash

# Configuration example: verify installed Intel NPU Driver version on Windows
pnputil /enum-drivers | findstr /I "Intel NPU"

# Disable the Intel NPU device by friendly name (run as Administrator)
pnputil /disable-device /deviceid "<INTEL_NPU_DEVICE_ID>"