CVE-2026-20739: Intel PROSet/Wireless WiFi DoS Vulnerability

CVE-2026-20739 Overview

CVE-2026-20739 affects Intel PROSet/Wireless WiFi Software for Windows. The vulnerability resides within Ring 2 device drivers and stems from an improper conditions check [CWE-754]. An unauthenticated network adversary within adjacent network range can trigger a denial of service condition. The flaw requires no user interaction and no special internal knowledge to exploit. The vulnerability impacts availability (high) of the affected system, with subsequent low availability impact on the broader system. Confidentiality and integrity remain unaffected.

Critical Impact
An adjacent unauthenticated attacker can trigger a denial of service against Intel PROSet/Wireless WiFi driver components, disrupting wireless connectivity on affected Windows systems.

Affected Products

Intel PROSet/Wireless WiFi Software for Windows
Intel Wireless device drivers operating within Ring 2
Windows systems using affected Intel wireless components

Discovery Timeline

2026-08-11 - CVE-2026-20739 published to NVD
2026-08-12 - Last updated in NVD database

Technical Details for CVE-2026-20739

Vulnerability Analysis

CVE-2026-20739 is classified as an improper check for unusual or exceptional conditions [CWE-754]. The vulnerability exists within Ring 2 device drivers supplied with Intel PROSet/Wireless WiFi Software for Windows. Ring 2 corresponds to a driver privilege layer between user mode and the kernel core. When the driver fails to validate specific conditions during wireless frame or management packet handling, an adversary can force the driver into an unrecoverable state. The result is a denial of service against wireless network functionality on the target host.

Root Cause

The root cause is an improper conditions check within the wireless driver code path. The driver does not adequately validate the state or parameters of incoming inputs before acting on them. Missing validation on exceptional conditions allows adversary-controlled input to reach code that assumes valid preconditions. This produces the denial of service outcome described in the Intel advisory.

Attack Vector

The attack vector is adjacent network access, meaning the adversary must be within radio range of the target wireless interface. Authentication is not required, and attack complexity is low. The adversary transmits crafted wireless traffic that the vulnerable driver processes without proper condition validation. Successful exploitation results in loss of wireless availability on the affected host. For additional technical details, refer to the Intel Security Advisory SA-01422.

Detection Methods for CVE-2026-20739

Indicators of Compromise

Unexpected crashes or hangs of the Intel PROSet/Wireless WiFi driver on Windows endpoints
Repeated wireless interface resets or disconnects without corresponding user action
Windows Event Log entries referencing wireless driver faults or bugchecks tied to Intel wireless components
Loss of wireless connectivity coinciding with unknown devices operating within radio range

Detection Strategies

Monitor endpoint telemetry for driver fault events and abnormal termination of wireless service components
Correlate wireless disconnect patterns across multiple endpoints in the same physical location to identify targeted DoS activity
Inventory Intel PROSet/Wireless WiFi Software versions across the fleet and flag hosts running versions listed in Intel SA-01422

Monitoring Recommendations

Alert on repeated Windows kernel or driver crash events referencing Intel wireless driver binaries
Track wireless adapter state transitions to identify frequent forced resets
Review wireless intrusion detection logs for anomalous management or control frames near affected endpoints

How to Mitigate CVE-2026-20739

Immediate Actions Required

Identify all Windows systems running Intel PROSet/Wireless WiFi Software and inventory installed driver versions
Apply the driver updates referenced in Intel Security Advisory SA-01422 as soon as they are available for your platform
Prioritize patching for mobile and remote endpoints that regularly operate in untrusted wireless environments

Patch Information

Intel has published mitigation guidance in Intel Security Advisory SA-01422. Administrators should consult the advisory for the specific fixed driver versions and apply updates through Intel Driver & Support Assistant, the OEM update channel, or enterprise software distribution tools.

Workarounds

Disable the Intel wireless adapter on high-risk systems until the driver update is deployed, using wired connectivity where feasible
Restrict use of affected devices in untrusted physical environments where an adversary could operate within radio range
Enforce use of managed wireless infrastructure with wireless intrusion prevention to reduce exposure to rogue transmitters

bash

# Query installed Intel wireless driver version on Windows
pnputil /enum-drivers | findstr /I "Intel Wireless"

# Disable the wireless adapter as a temporary workaround
netsh interface set interface name="Wi-Fi" admin=disabled