CVE-2026-20891 Overview
CVE-2026-20891 is an improper authentication vulnerability [CWE-287] in Intel PROSet/Wireless WiFi Software for Windows. The flaw resides within Ring 2: Device Drivers and may allow an unprivileged local attacker to escalate privileges. Exploitation requires no user interaction and no special internal knowledge, and the attack complexity is low. A successful attack can result in local code execution and subsequent high impact on system confidentiality with additional low impacts to integrity and availability.
Critical Impact
Local privilege escalation through the wireless driver enables an unauthenticated, unprivileged user to execute code that compromises system confidentiality and affects broader integrity and availability.
Affected Products
- Intel PROSet/Wireless WiFi Software for Windows (device driver component, Ring 2)
- Refer to Intel Security Advisory SA-01422 for the complete list of affected driver versions
Discovery Timeline
- 2026-08-11 - CVE-2026-20891 published to NVD
- 2026-08-12 - Last updated in NVD database
Technical Details for CVE-2026-20891
Vulnerability Analysis
The vulnerability is classified as improper authentication [CWE-287] within the Intel PROSet/Wireless WiFi Software device driver stack. Device drivers execute in a privileged context on Windows, so weaknesses in their authentication logic directly expose kernel-adjacent functionality to user-mode callers. In this case the driver fails to properly validate the identity or privilege of the caller before performing sensitive operations. An unprivileged process on the local system can invoke driver interfaces that should be restricted to authenticated or elevated components. The resulting local code execution primarily impacts confidentiality of the surrounding system, with lesser effects on integrity and availability.
Root Cause
The root cause is missing or insufficient authentication checks in a driver interface exposed by the Intel PROSet/Wireless WiFi Software. Because the affected code runs within a Ring 2 device driver boundary, any accepted request executes with driver-level privileges. Intel has not released public code-level details for this issue.
Attack Vector
The attack vector is local. An adversary must already have a foothold on the target Windows system as an unprivileged user. From that context the attacker interacts with the vulnerable driver interface directly, without needing to authenticate and without user interaction. See the Intel Security Advisory SA-01422 for technical details.
No verified public proof-of-concept code is available at this time.
Detection Methods for CVE-2026-20891
Indicators of Compromise
- Unexpected loading or handle acquisition of Intel PROSet/Wireless WiFi driver device objects by non-Intel or unsigned processes
- Unprivileged processes spawning elevated child processes shortly after interacting with the wireless driver stack
- Anomalous IOCTL traffic to Intel wireless driver device names from user-mode applications
Detection Strategies
- Inventory endpoints running Intel PROSet/Wireless WiFi Software and cross-reference driver versions against Intel Security Advisory SA-01422
- Baseline the set of legitimate processes that open handles to Intel wireless device objects and alert on deviations
- Correlate local privilege escalation behaviors, such as token manipulation or unexpected SYSTEM child processes, with prior wireless driver interactions
Monitoring Recommendations
- Enable Windows kernel driver load and process creation telemetry across all mobile and laptop endpoints
- Monitor EDR telemetry for suspicious IOCTL patterns and privilege changes originating from user-mode wireless utilities
- Track patch compliance for Intel wireless driver packages as part of endpoint hygiene reporting
How to Mitigate CVE-2026-20891
Immediate Actions Required
- Identify all Windows systems with Intel PROSet/Wireless WiFi Software installed, including managed laptops and remote workers
- Apply the driver updates referenced in Intel Security Advisory SA-01422 as soon as validated in your environment
- Restrict local logon and interactive access on high-value systems until patching is complete
Patch Information
Intel has published remediation guidance in Intel Security Advisory SA-01422. Administrators should upgrade the Intel PROSet/Wireless WiFi Software to the fixed version specified in that advisory. Driver updates may be delivered through Intel Driver & Support Assistant, OEM update channels, or enterprise software distribution.
Workarounds
- Where the wireless functionality is not required, disable or uninstall the Intel PROSet/Wireless WiFi driver until patches are deployed
- Enforce least privilege on end-user accounts to limit the pool of adversaries able to trigger the local attack
- Apply application control policies that restrict which processes may interact with the affected driver device objects
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
