CVE-2022-42763 in SC9863A
Summary
by MITRE • 12/06/2022
In wlan driver, there is a possible missing bounds check, This could lead to local denial of service in wlan services.
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Analysis
by VulDB Data Team • 04/23/2025
The vulnerability identified as CVE-2022-42763 resides within wireless local area network driver components, specifically affecting the handling of data structures during wireless communication processes. This issue manifests as a potential missing bounds check that could be exploited to disrupt wireless services locally. The flaw occurs in the kernel-level wireless driver implementation where insufficient validation of input parameters or buffer boundaries allows for improper memory access patterns. Such vulnerabilities are particularly concerning in wireless networking contexts where drivers must process untrusted data from various network sources including malicious adversaries.
The technical nature of this vulnerability aligns with CWE-129, which describes improper validation of array index bounds, and CWE-131, which covers improper handling of buffer size. The missing bounds check typically occurs when the driver fails to validate the size or range of incoming data before processing it, leading to potential buffer overflows or underflows. In wireless driver contexts, this can happen when processing management frames, association requests, or other network control information that contains variable-length fields. The flaw creates a condition where the driver might attempt to access memory locations beyond the allocated buffer boundaries, potentially causing system instability or complete service disruption.
From an operational perspective, this vulnerability presents a local denial of service risk that can severely impact wireless connectivity within affected systems. When exploited, the missing bounds check allows an attacker with local access to potentially crash wireless services, forcing users to reconnect to networks or restart their wireless adapters. The impact extends beyond simple service disruption as it can affect enterprise wireless infrastructure where multiple devices rely on stable wireless connectivity for business operations. In mobile environments, this could lead to communication failures during critical operations, while in enterprise settings it might cause widespread network disruption across multiple devices. The vulnerability's local nature means that exploitation requires physical or network access to the target system, but this access level is often achievable in environments where wireless services are critical to operations.
Mitigation strategies for CVE-2022-42763 should focus on implementing comprehensive bounds checking mechanisms within the wireless driver codebase. System administrators should prioritize applying vendor-provided patches or updates that address the specific bounds check implementation issues. The remediation process involves strengthening input validation routines to ensure that all buffer access operations include proper size verification before memory operations occur. Additionally, implementing runtime protections such as stack canaries, address space layout randomization, and kernel address space layout randomization can provide additional defense-in-depth measures. Network segmentation and access controls should be reinforced to limit local access points that could be exploited for this vulnerability. Organizations should also consider implementing monitoring solutions that can detect anomalous wireless service behavior indicative of potential exploitation attempts, as outlined in the attack patterns documented under the mitre attack framework for privilege escalation and denial of service techniques. Regular security assessments of wireless infrastructure components and maintaining up-to-date driver versions remain critical defensive measures against such vulnerabilities.