CVE-2022-46897 in InsydeH2O
Summary
by MITRE • 04/22/2024
An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. The CapsuleIFWUSmm driver does not check the return value from a method or function. This can prevent it from detecting unexpected states and conditions.
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Analysis
by VulDB Data Team • 07/29/2025
The vulnerability identified as CVE-2022-46897 resides within the Insyde InsydeH2O firmware implementation specifically affecting kernel versions 5.0 through 5.5. This issue manifests in the CapsuleIFWUSmm driver component which operates within the System Management Mode context of the firmware stack. The root cause stems from inadequate error handling mechanisms within the driver's code structure where return values from critical method calls are not properly validated or checked. This fundamental flaw creates a scenario where the driver cannot reliably detect and respond to unexpected operational states or error conditions that may arise during execution. The absence of proper return value validation represents a classic software engineering oversight that can have severe implications for system stability and security.
The technical implications of this vulnerability extend beyond simple error handling failures as it creates potential attack vectors for malicious actors seeking to exploit the firmware's operational weaknesses. When the CapsuleIFWUSmm driver fails to verify method return values, it essentially operates in a state of uncertainty where it cannot determine whether critical operations have completed successfully or encountered failures. This lack of state awareness can lead to inconsistent behavior, potential system crashes, or more concerning scenarios where the driver continues execution despite encountering critical errors. The vulnerability aligns with CWE-252, which specifically addresses the issue of unchecked return values in software components, and demonstrates how such oversights can compromise system integrity at the firmware level. The affected kernel versions 5.0 through 5.5 represent a significant timeframe where this particular driver implementation was actively deployed, making numerous systems potentially vulnerable to exploitation.
From an operational standpoint, the impact of this vulnerability can be substantial as it affects the reliability and security posture of firmware-based systems that rely on InsydeH2O implementations. The driver's inability to detect unexpected conditions means that legitimate error states may go unnoticed, potentially leading to system instability or failure to properly handle firmware update processes. This is particularly concerning in enterprise environments where firmware reliability is paramount for maintaining operational continuity. The vulnerability also creates opportunities for privilege escalation attacks or denial of service conditions, as attackers could potentially manipulate the driver's behavior by causing specific error conditions that the driver fails to properly handle. The operational risk is compounded by the fact that these firmware-level issues often remain undetected until specific conditions trigger the error paths, making proactive identification and remediation challenging. According to ATT&CK framework category T1068, this vulnerability could enable initial access or privilege escalation through firmware manipulation techniques.
Mitigation strategies for CVE-2022-46897 must focus on both immediate remediation and long-term architectural improvements to prevent similar issues in future firmware implementations. The primary recommendation involves updating to InsydeH2O firmware versions that contain patches addressing the missing return value checks within the CapsuleIFWUSmm driver. Organizations should prioritize firmware updates from Insyde or their hardware vendors to ensure complete remediation of the vulnerability. Additionally, system administrators should implement monitoring solutions that can detect anomalous behavior in firmware components, particularly focusing on error state detection and system stability metrics. The vulnerability highlights the critical importance of comprehensive error handling in firmware code and suggests that security reviews should include specific checks for return value validation across all system management mode components. Organizations should also consider implementing firmware integrity verification mechanisms to detect unauthorized modifications that could exacerbate the vulnerability. The remediation process should include thorough testing to ensure that the firmware updates do not introduce compatibility issues with existing system configurations while maintaining the enhanced error handling capabilities that address the core vulnerability.