CVE-2026-20741

Executive Summary

CVE-2026-20741 is an improper access control vulnerability (CWE-284) in the Ring 2: Device Drivers component of Intel(R) PROSet/Wireless WiFi Software. A local, unprivileged, unauthenticated software adversary can trigger a high-availability-impact denial-of-service condition with low attack complexity and no user interaction. Affected systems are those running the affected Intel wireless driver stack; no affected version range has been disclosed, and no vendor patch, workaround, or public exploit has been confirmed as of the reporting date.

Technical Analysis

The NVD description characterizes the flaw as an improper access control issue (CWE-284) present in the device-driver layer ("Ring 2: Device Drivers") of Intel PROSet/Wireless WiFi Software. In this vulnerability class, the affected component fails to enforce the necessary authorization checks on operations or interfaces that should be restricted to more privileged callers. Because the affected component is a device driver, the practical consequence is that an unprivileged software process running in user mode is able to invoke driver-level operations that the driver does not adequately gate or validate.

The published description indicates the following constraints and characteristics:

• Attack vector: local access — the adversary requires the ability to execute software on the target system.
• Privilege required: none beyond an unprivileged, unauthenticated user context; the adversary is described as "unprivileged software."
• Attack complexity: low — no significant conditions or race dependencies are described.
• User interaction: none.
• Attack requirements: "not present" — i.e., no special internal knowledge of the system is needed to trigger the flaw.

The impact profile is notable for its asymmetry: confidentiality impact is none and integrity impact is none at the initial stage, while availability impact is high. The description further notes subsequent system-level impacts of integrity (low) and availability (high). This pattern is consistent with a driver crash, hang, or uncontrolled reset that renders the wireless interface (and in some cases the broader system) temporarily or persistently unavailable.

Exact technical detail is sparse. No function names, IOCTL codes, driver binary names, registry paths, or API endpoints are disclosed in the NVD description or CNA title. It is therefore not possible to state precisely which driver interface is at fault, whether the flaw involves a malformed request to a device control interface, an improper privilege check on a state-changing operation, or a failure to validate the integrity of a caller. This report describes the vulnerability at the class and mechanism level, and security teams should treat the analysis as provisional until a vendor advisory with implementation-level detail is published.

Exploitation Scenarios

No public PoC or exploit code is available, and the CVE is not listed in the CISA Known Exploited Vulnerabilities catalog. The attack chain below is therefore inferred from the vulnerability class (CWE-284 — improper access control) and the constraints in the NVD description.

1. Reconnaissance / target identification. Because the attack is local and requires no special internal knowledge, the primary targeting input is the presence of Intel PROSet/Wireless WiFi Software on the host. An adversary who has already established a low-privileged foothold (e.g., through a malicious document, supply-chain compromise of an application, or a rogue insider) can enumerate installed software to confirm the Intel wireless driver stack is present. The lack of a disclosed affected-version range means the adversary may simply probe for the driver interface rather than fingerprinting a specific build.

2. Triggering the flaw. The adversary invokes the affected driver component with requests that, per the vulnerability description, the driver fails to gate through proper access control. At the class level, this means the unprivileged process is able to reach a driver operation that should require a higher privilege level, or is able to pass inputs that the driver does not adequately authorize or validate. The attack is described as low complexity, requiring no user interaction and no special internal knowledge, which suggests a straightforward call sequence rather than an involved exploitation technique.

3. Payload / execution. The payload is a functional request sequence — no memory-corruption payload is implied by the description. The adversary causes the driver to enter an invalid state, hang, or terminate, resulting in loss of wireless functionality. Because the root cause is improper access control rather than a memory-safety bug, the most probable outcome is a controlled failure (e.g., device reset, service termination, or watchdog-triggered driver restart) rather than code execution. The description’s subsequent integrity impact of "low" is consistent with the possibility of corrupted driver state or an unexpected system restart in some scenarios, but there is no evidence to support privilege escalation or arbitrary code execution.

4. Post-exploitation impact. The immediate impact is denial of service: the wireless interface becomes unavailable, potentially forcing the host off the corporate network, disrupting VPN connectivity, and interrupting security telemetry egress. An adversary with persistent local access could re-trigger the condition repeatedly to maintain the denial-of-service state, degrading endpoint availability and hindering incident response. The impact remains confined to the local host; no network propagation, lateral movement, or data confidentiality loss is indicated by the published description.

Impact Assessment

Business impact. For enterprise fleets, the most direct consequence is availability loss affecting wireless-connected endpoints: laptops, mobile workstations, and any system relying on the Intel PROSet/Wireless WiFi driver stack. A local unprivileged adversary — including a compromised low-privilege account or a malicious insider — can knock a device off the network at will. In environments that depend on Wi-Fi for authentication flows, endpoint management, or VPN bootstrap, repeated driver crashes can disrupt user productivity, patch deployment, and security monitoring. The vulnerability does not directly expose data (confidentiality impact: none) and does not initially corrupt data (integrity impact: none at the primary stage), which bounds the worst-case blast radius to availability rather than data compromise.

Affected systems. Any system running Intel PROSet/Wireless WiFi Software with the affected Ring 2 device drivers. The vendor has not disclosed a version range, so the entire product line should be considered potentially exposed until an advisory clarifies the scope.

Severity context. No CVSS vector or score has been published by the vendor (CVSS: N/A). The qualitative profile — local access, low complexity, no user interaction, high availability impact — maps to a moderate-to-high severity in most scoring frameworks, but without an official vector, teams should not assign a definitive CVSS figure. The EPSS score of 0.00121 (2.2nd percentile of exploited CVEs) indicates a low current likelihood of exploitation in the wild, and the absence of public PoC/exploit code and CISA KEV listing reinforces that assessment. This is a vulnerability to monitor and patch pre-emptively rather than one exhibiting active exploitation pressure.

Detection Guidance

Detection of this vulnerability is challenging for two reasons: the attack is local (limited network signature), and the lack of implementation detail prevents signature-based detection of the exact triggering call. Detection should therefore focus on consequence telemetry — driver instability, service termination, and abnormal device failure events on hosts running Intel wireless drivers. The rules below are templates built from the product name in the CVE description and standard Windows event telemetry; tune them to your environment and verify field names against your log schema.

Sigma Rule

title: Intel PROSet Wireless Driver Service Termination - CVE-2026-20741
id: 9f8e6d3c-2b4a-4e7f-9c1d-5a6b7c8d9e0f
status: experimental
description: >
    Detects unexpected termination of Intel PROSet/Wireless WiFi driver services
    or related application crashes, which may indicate exploitation of
    CVE-2026-20741 (improper access control leading to local denial of service).
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2026-20741
author: Valtersit Threat Intelligence
date: 2026/01/01
logsource:
    product: windows
    service: system
detection:
    selection_service_crash:
        EventID:
            - 7031   # Service terminated unexpectedly
            - 7034   # Service terminated unexpectedly
        param1|contains|all:
            - 'Intel'
            - 'PROSet'
    selection_app_crash:
        EventID: 1000  # Application Error
        param2|contains|all:
            - 'Intel'
            - 'Wireless'
    condition: selection_service_crash or selection_app_crash
falsepositives:
    - Legitimate driver updates or system reboots
    - End-user initiated driver restarts during troubleshooting
level: medium
tags:
    - attack.impact
    - attack.t1499
    - cve.2026-20741

YARA Rule

rule intel_proset_wireless_driver_artifacts
{
    meta:
        author = "Valtersit Threat Intelligence"
        description = "Detects files, installers, and crash dumps referencing Intel PROSet/Wireless WiFi Software for CVE-2026-20741 triage"
        cve = "CVE-2026-20741"
        date = "2026-01-01"
    strings:
        $s1 = "Intel(R) PROSet/Wireless WiFi Software" ascii wide nocase
        $s2 = "PROSet/Wireless" ascii wide nocase
        $s3 = "Intel Wireless WiFi" ascii wide nocase
        $s4 = "Ring 2: Device Drivers" ascii wide nocase
    condition:
        uint16(0) == 0x5A4D and filesize < 100MB and 2 of ($s1, $s2, $s3, $s4)
}

Note: This YARA rule is intended for forensic triage — scanning driver packages, installer caches, and memory dumps (e.g., from crash dump analysis) for artifacts referencing the affected component. It is not a signature for the triggering call, which is not publicly documented.

Suricata IDS Rule

Because the CVE is a local-access issue, network-layer detection is indirect at best. The rule below is an experimental, inferred coverage aid for wireless tap/monitor deployments; it flags storms of malformed 802.11 management frames that could be used in an attempt to destabilize the wireless driver stack. It is not a confirmed signature for this CVE.

alert wlan any any -> any any (msg:"CVE-2026-20741 i: Possible malformed 802.11 management frame storm against Intel wireless clients"; wlan.fc.type:0; threshold:type both, track by_src, count 100, seconds 10; classtype:attempted-dos; sid:2026074101; rev:1;)

Caveats: this rule requires the Suricata wlan decoder enabled on a monitoring interface that can capture Wi-Fi traffic (not a standard wired tap). It may generate false positives in dense wireless environments. For most enterprise deployments, the Sigma/Elastic/Splunk/Wazuh rules below are more directly actionable.

Elastic Detection

any where event.code in ("7031", "7034", "1000")
  and (
    wildcard(winlog.event_data.param1, "*Intel*PROSet*", "*PROSet*Wireless*", "*Intel*Wireless*") or
    wildcard(winlog.event_data.param2, "*Intel*PROSet*", "*Intel*Wireless*")
  )

This EQL query matches Windows System/Application log entries (via Winlogbeat) where a service or module name references the Intel PROSet/Wireless product family. Adjust the event code list and field names (winlog.event_data.param1/param2) to match your Winlogbeat schema and Windows event log configuration.

Splunk SPL Query

index=windows (EventCode=7031 OR EventCode=7034 OR EventCode=1000)
| eval suspicious = if(match(param1, "(?i)intel.*proset|proset.*wireless|intel.*wireless") OR match(param2, "(?i)intel.*proset|intel.*wireless"), 1, 0)
| where suspicious = 1
| table _time, host, EventCode, param1, param2, Message
| sort - _time

Run this against a Windows event log index (adjust index= to your environment). It surfaces repeated driver/service failures tied to Intel wireless components, which should be correlated with endpoint uptime and user-reported Wi-Fi loss.

Wazuh OSSEC Rule

<group name="windows,system,">
  <rule id="100241" level="10">
    <if_sid>18103</if_sid>
    <field name="win.eventdata.eventID">^7031$|^7034$</field>
    <regex>Intel.*PROSet|PROSet.*Wireless|Intel.*Wireless</regex>
    <description>CVE-2026-20741: Intel PROSet/Wireless WiFi service terminated unexpectedly - possible local denial of service.</description>
    <group>intel_proset_dos,</group>
  </rule>
</group>

Note: This local rule assumes the standard Wazuh Windows event decoder and parent rule (18103) are present. Verify the field mapping (win.eventdata.eventID, and the service-name field in your decoder output) before production deployment. Escalate on repeated occurrences within a short time window.

Mitigation & Patch Guidance

Patch status: UNPATCHED — no patch evidence from any tracked source (confidence 0/4). No vendor fix, workaround, or technical advisory has been published. The vendor has not identified affected versions, which further complicates patching.

1. Immediate mitigations (until a patch exists):

• Restrict local access. The attack requires local execution of unprivileged software. Enforce least privilege, disable local accounts where possible, and restrict interactive logon to trusted users.
• Application control. Use application whitelisting/allow-listing to prevent arbitrary unprivileged binaries from running on sensitive endpoints, reducing the practical attack surface for a local adversary.
• Monitor driver/device telemetry. Deploy the detection rules above to alert on Intel wireless driver crashes or service terminations. Correlate with endpoint uptime and wireless connectivity loss.
• Disable when not required. For device classes that do not require Wi-Fi, disable the Intel wireless adapter via BIOS/Group Policy to remove the attack surface entirely.
• Isolate untrusted workloads. Run untrusted code in virtualized or sandboxed environments so that a compromise does not yield local access to hosts with the vulnerable driver.

2. Patch/upgrade steps:

• No vendor-fixed build is currently available. Monitor the Intel Product Security Center and the NVD entry for this CVE for an advisory.
• When an updated PROSet/Wireless WiFi driver is released, deploy it through your standard patch management process (Windows Update, Intune, SCCM, or Intel Driver & Support Assistant), prioritizing endpoints that allow untrusted local users.
• Maintain a driver inventory so that the fixed version can be verified against the vendor’s eventual affected-version list.

3. Long-term hardening:

• Subscribe to Intel security advisories and the CVE feed to catch the patch the day it ships.
• Adopt a formal driver-patching cadence; WiFi/network drivers are frequently excluded from standard OS patching and require explicit management.
• For high-security environments, consider enforcing signed-driver policies and kernel-mode code-integrity protections (e.g., Memory Integrity/HVCI), which can constrain how unprivileged processes interact with driver interfaces even when a driver contains access-control defects.
• Re-evaluate the risk posture for Wi-Fi-dependent endpoints; where feasible, prefer wired connectivity for high-value assets to eliminate wireless-stack exposure.

References

1. NVD Entry — https://nvd.nist.gov/vuln/detail/CVE-2026-20741 (official vulnerability description and reference data).
2. MITRE CVE Record — https://www.cve.org/CVERecord?id=CVE-2026-20741 (CVE record with CNA metadata; note that the CNA title field is empty).
3. Intel Product Security Center — https://www.intel.com/content/www/us/en/security-center/default.html (monitor for the forthcoming vendor advisory; no CVE-specific advisory URL has been published).
4. CISA Known Exploited Vulnerabilities Catalog — https://www.cisa.gov/known-exploited-vulnerabilities-catalog (CVE-2026-20741 is not listed; no in-the-wild exploitation evidence at the time of writing).
5. FIRST EPSS — https://www.first.org/epss/ (EPSS score for this CVE: 0.00121, 2.2nd percentile — low current exploitation likelihood).

Threat-actor campaign note: As of the reporting date, no known threat actor campaigns, exploit-in-the-wild evidence, public PoC, or Nuclei/exploit-code coverage has been identified for CVE-2026-20741. Technical implementation details beyond the NVD description remain undisclosed; analysts should treat all exploitation mechanics described in this report as class-level inference rather than confirmed driver-specific behavior.