CVE-2026-101172 in HarmonyOS
Summary
by MITRE • 11/02/2026
Permission control vulnerability in the graphics module. Impact: Successful exploitation of this vulnerability may affect confidentiality.
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Analysis
by VulDB Data Team • 11/02/2026
The identified security flaw resides within the core graphics subsystem of the operating environment, specifically concerning how access permissions are validated and enforced for graphical resources. This permission control vulnerability indicates a fundamental failure in the principle of least privilege or proper authorization checks when processes attempt to interact with display buffers, window managers, or hardware acceleration interfaces. In modern computing architectures, the graphics module serves as a critical bridge between user-space applications and kernel-level drivers, handling sensitive operations such as memory mapping for framebuffers and context switching for rendering pipelines. When permission controls are inadequately implemented within this layer, it creates an avenue for unauthorized entities to bypass standard security boundaries that normally isolate different processes or users from one another.
The technical nature of this flaw typically involves a race condition, logic error, or missing access control check during the initialization or manipulation of graphical contexts. An attacker who has gained local execution capability within a lower-privileged context can exploit these weaknesses to read memory regions allocated for higher-privilege processes or system services that render visual data. This might include accessing shared buffers used by authentication dialogs, secure input fields, or other sensitive UI components managed by privileged daemons. The vulnerability does not necessarily require remote exploitation but rather local access with the ability to spawn threads or child processes that can interact with the graphics API in a manner that circumvents expected restrictions.
The operational impact of this vulnerability is primarily centered on confidentiality breaches. By successfully exploiting this flaw, an attacker can extract sensitive information displayed on the screen or stored within graphical memory structures without direct file system access. This could lead to the exposure of session tokens, passwords entered into secure fields, proprietary data being rendered in applications, or cryptographic keys used for display encryption if such mechanisms are present. The ability to read these protected areas effectively breaks the isolation guarantees provided by the operating system's security model, allowing a compromised low-privilege account to escalate its informational reach significantly beyond what is intended.
From an industry standards perspective, this vulnerability aligns closely with CWE-269 Improper Privilege Management and CWE-732 Incorrect Permission Assignment for Critical Resource. The failure lies in the assignment or verification of permissions that govern access to critical system resources, specifically those related to graphical output and memory management. In terms of attack vectors, this falls under MITRE ATT&CK technique T1059 Command and Scripting Interpreter if exploited via scriptable interfaces, but more accurately maps to T1074 Data Staged or T1082 System Information Discovery when the goal is to gather information from the local system. The exploitation path often involves leveraging API calls that interact with the display server protocol, such as X11 or Wayland extensions, where permission checks may be bypassed through malformed requests or timing attacks against synchronization primitives.
Mitigation strategies must focus on hardening the graphics subsystem's access control mechanisms. Developers should implement strict validation of all incoming requests to ensure they originate from authorized contexts and possess the necessary privileges for the requested operation. Implementing mandatory access controls, such as SELinux or AppArmor profiles tailored specifically for graphical services, can provide an additional layer of defense by restricting what resources specific processes are allowed to touch regardless of traditional Unix permissions. Furthermore, regular code audits focusing on race conditions in resource allocation and deallocation within the graphics driver stack are essential. For system administrators, applying vendor-provided patches that address these permission checks is critical until a permanent fix is deployed. Isolating graphical services from high-security contexts using containerization or sandboxing techniques can also reduce the blast radius if such an exploit were to occur in production environments.