CVE-2026-20778 Overview
CVE-2026-20778 is an out-of-bounds read vulnerability [CWE-125] in certain Intel PROSet/Wireless WiFi Software for Windows. The flaw resides within Ring 0 kernel code, meaning exploitation targets the highest-privileged execution context on the affected system. An unauthenticated, unprivileged attacker on an adjacent network can trigger the condition to cause a denial of service. Intel documented the issue in Intel Security Advisory SA-01468.
The vulnerability affects only availability, with no confidentiality or integrity impact. Exploitation requires no user interaction, though attack complexity is high and specific attack requirements must be present.
Critical Impact
Successful exploitation crashes the kernel driver, producing a system-wide denial of service on affected Windows hosts running Intel PROSet/Wireless WiFi Software.
Affected Products
- Intel PROSet/Wireless WiFi Software for Windows (specific versions per Intel SA-01468)
- Windows systems running the vulnerable Intel wireless kernel driver
- Endpoints operating within radio range of an attacker-controlled wireless environment
Discovery Timeline
- 2026-08-11 - CVE-2026-20778 published to NVD
- 2026-08-12 - Last updated in NVD database
Technical Details for CVE-2026-20778
Vulnerability Analysis
The vulnerability is an out-of-bounds read [CWE-125] inside Ring 0 kernel code shipped with Intel PROSet/Wireless WiFi Software for Windows. Kernel-mode drivers process incoming wireless frames at a highly privileged level, where invalid memory access aborts the driver and typically triggers a bugcheck.
An attacker on an adjacent wireless network can send crafted frames that cause the driver to read outside allocated buffer boundaries. Because the read happens in kernel context, the resulting fault brings down the operating system rather than a single user-space process. The impact is limited to availability, with no data exposure or memory corruption enabling code execution.
Exploitation carries high attack complexity and depends on specific runtime conditions being present. No user interaction is required, and the attacker does not need credentials on the target system.
Root Cause
The root cause is missing or insufficient bounds validation when the kernel driver parses wireless protocol data. When input dimensions fall outside expected ranges, the driver dereferences memory past the end of an allocated buffer, producing an out-of-bounds read that faults the kernel.
Attack Vector
The attack vector is Adjacent Network. An attacker must be within wireless range of the target and able to transmit frames that reach the vulnerable driver. Remote exploitation across routed networks is not applicable. The vulnerability is described in the Intel Security Advisory SA-01468.
Detection Methods for CVE-2026-20778
Indicators of Compromise
- Unexpected kernel bugchecks or blue screen events referencing Intel wireless driver modules on affected Windows hosts
- Repeated wireless driver crashes correlated with the presence of unknown wireless transmitters in physical proximity
- Loss of wireless connectivity followed by system reboot without corresponding user-initiated action
Detection Strategies
- Correlate Windows crash dump telemetry against known Intel PROSet/Wireless driver filenames to identify recurring faults
- Monitor endpoint stability metrics for clusters of denial-of-service events across systems sharing the same wireless driver version
- Review wireless environment scans for anomalous devices or frames coinciding with driver crashes
Monitoring Recommendations
- Ingest Windows Event Log system crashes and driver fault events into a centralized logging platform for cross-host analysis
- Track Intel PROSet/Wireless WiFi Software version inventory across managed endpoints to identify unpatched systems
- Establish alerting thresholds for repeated kernel-mode faults on the same host within short time windows
How to Mitigate CVE-2026-20778
Immediate Actions Required
- Inventory all Windows endpoints running Intel PROSet/Wireless WiFi Software and identify versions listed in Intel SA-01468
- Apply the updated Intel PROSet/Wireless WiFi Software release published by Intel as soon as validation permits
- Prioritize deployment for mobile and field devices that regularly connect to untrusted wireless environments
Patch Information
Intel published guidance and fixed software versions in the Intel Security Advisory SA-01468. Administrators should consult the advisory for the specific fixed driver and software versions applicable to their hardware, then deploy through standard endpoint management tooling.
Workarounds
- Disable the Intel wireless adapter on affected systems that do not require wireless connectivity until patching is complete
- Restrict use of affected devices to trusted wireless networks and avoid public or untrusted radio environments
- Enforce endpoint hardening policies that limit connection to known enterprise access points where feasible
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
