CVE-2026-18485: NI-PAL Privilege Escalation Vulnerability

CVE-2026-18485 Overview

CVE-2026-18485 is a local privilege escalation vulnerability in the NI-PAL kernel driver from NI (formerly National Instruments). The flaw affects NI-PAL version 26.3.1 and prior on Microsoft Windows. A local, authenticated user can exploit the driver to escalate privileges and execute arbitrary code in kernel context. The weakness is categorized under CWE-1285 (Improper Validation of Specified Index, Position, or Offset in Input).

Critical Impact
A low-privileged local user can gain SYSTEM-level code execution on Windows hosts running vulnerable NI-PAL driver versions, compromising confidentiality, integrity, and availability of the host.

Affected Products

NI-PAL kernel driver version 26.3.1
NI-PAL kernel driver versions prior to 26.3.1
Microsoft Windows systems running the affected NI-PAL driver

Discovery Timeline

2026-08-05 - CVE-2026-18485 published to NVD
2026-08-06 - Last updated in NVD database

Technical Details for CVE-2026-18485

Vulnerability Analysis

The vulnerability resides in the NI-PAL kernel-mode driver, a shared Platform Abstraction Layer component installed by numerous NI software packages on Windows. Kernel drivers execute at Ring 0, so any weakness in input validation directly threatens the security boundary between user mode and the kernel. The CWE-1285 classification indicates the driver improperly validates a specified index, position, or offset supplied through an input path reachable from user mode. An authenticated local user can craft a request that steers the driver into referencing memory outside intended bounds, producing controllable kernel behavior that leads to arbitrary code execution.

Root Cause

The root cause is missing or insufficient validation of an index, position, or offset value passed into the NI-PAL driver from a user-mode caller. Because the driver trusts the supplied value without confirming it falls within an expected range, subsequent memory access or dispatch logic operates on attacker-influenced data. NI has not published low-level exploitation details in the referenced advisory.

Attack Vector

Exploitation requires local access and valid, low-privilege authentication on the target Windows host. The attacker opens a handle to the NI-PAL device object and issues an IOCTL or equivalent request containing a malformed index or offset. Successful exploitation elevates the process to NT AUTHORITY\SYSTEM, enabling arbitrary code execution, credential theft, and persistence. No user interaction is required beyond the attacker's own session.

No public proof-of-concept exploit is currently available for CVE-2026-18485. Refer to the NI Critical Security Update for vendor-supplied technical details.

Detection Methods for CVE-2026-18485

Indicators of Compromise

Unexpected user-mode processes opening handles to the NI-PAL device object followed by anomalous IOCTL traffic.
New SYSTEM-level processes spawned from non-administrative parent processes on hosts with NI software installed.
Kernel bug checks or driver-related crash dumps referencing the NI-PAL driver image without a matching hardware or workload cause.

Detection Strategies

Inventory endpoints for the presence and version of the NI-PAL driver and flag any instance at or below version 26.3.1.
Monitor for token manipulation and privilege escalation patterns originating from processes that interact with NI-PAL device objects.
Correlate local logon events with subsequent SYSTEM process creation to surface abnormal privilege transitions.

Monitoring Recommendations

Enable Windows kernel-mode driver load auditing and forward events to a centralized analytics platform.
Track file integrity of the NI-PAL driver binary and alert on unexpected modifications or downgrade attempts.
Alert on process creation chains where non-administrative accounts spawn administrative tooling shortly after interacting with NI drivers.

How to Mitigate CVE-2026-18485

Immediate Actions Required

Identify all Windows systems with NI software installed and determine the installed NI-PAL driver version.
Apply the fixed NI-PAL release referenced in the NI Critical Security Update as soon as it is validated in your environment.
Restrict local interactive and remote desktop access on hosts running NI software to trusted administrators only.

Patch Information

NI has published guidance and update availability on its security advisory portal. Consult the NI Critical Security Update for the specific fixed version and applicable NI product bundles that ship the NI-PAL driver.

Workarounds

Where the driver is not required for active workloads, uninstall NI software components that install NI-PAL until patching completes.
Enforce least-privilege on Windows engineering and lab hosts to reduce the pool of accounts capable of triggering the local attack.
Apply application control policies to prevent unauthorized binaries from opening handles to the NI-PAL device object.

bash

# Query installed NI-PAL driver version on Windows (PowerShell)
Get-WmiObject Win32_PnPSignedDriver |
  Where-Object { $_.DeviceName -like '*NI-PAL*' -or $_.DriverProviderName -like '*National Instruments*' } |
  Select-Object DeviceName, DriverVersion, DriverProviderName, InfName