CVE-2026-20552 in ccci
Summary
by MITRE • 11/02/2026
In ccci, there is a possible out of bounds write due to a missing bounds check. This could lead to remote denial of service with no additional execution privileges needed. User interaction is needed for exploitation. Patch ID: ALPS11523478 (Note: For MT6880, MT6890) / ALPS11297423 (Note: For MT6813, MT6986, MT6982, MT6980D) / AUTO00864897 (Note: For MT2735, MT2737); Issue ID: MSV-10724.
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Analysis
by VulDB Data Team • 11/02/2026
The vulnerability identified in the ccci component represents a critical memory safety flaw characterized by an out-of-bounds write condition resulting from insufficient input validation and missing bounds checking mechanisms. This defect allows for the manipulation of memory structures beyond their allocated boundaries, which can lead to severe system instability or compromise depending on the specific context of the memory access. The affected components are integral parts of MediaTek's mobile processor architecture, specifically impacting chipsets such as MT6880, MT6890, MT6813, MT6986, MT6982, MT6980D, MT2735, and MT2737. The presence of this flaw indicates a fundamental failure in the boundary verification logic within the ccci driver or associated communication interfaces, which are responsible for managing data exchange between different processing subsystems within the system-on-chip environment.
From a technical perspective, an out-of-bounds write occurs when software writes data to a memory location that is outside the bounds of the intended buffer or array. In this specific instance, the absence of proper checks means that user-supplied input can dictate how much data is written and where it is placed in memory. This lack of validation creates a scenario where an attacker who controls the input stream can overwrite adjacent memory structures. Such overwrites may corrupt critical control flow data, such as function pointers or return addresses, although the primary reported impact focuses on system stability rather than arbitrary code execution. The vulnerability aligns with CWE-787, which defines out-of-bounds write vulnerabilities, and is often associated with CWE-20 regarding improper input validation that fails to restrict inputs to expected types, ranges, or lengths.
The operational impact of this vulnerability is primarily centered on remote denial of service capabilities. Because the flaw allows for memory corruption within a component that likely handles networked or inter-process communication data, an attacker can trigger the out-of-bounds write by sending specially crafted packets or messages through the affected interface. This action can cause the operating system kernel or the specific driver to crash, leading to a complete loss of service availability on the device. The severity is compounded by the fact that no additional execution privileges are required for exploitation, meaning even unprivileged users or remote attackers with limited access could potentially trigger this condition. However, the requirement for user interaction suggests that the attack vector may involve convincing a victim to initiate an action that triggers the vulnerable code path, such as opening a malicious file or visiting a compromised webpage that interacts with the ccci subsystem.
In terms of threat modeling and adversary behavior, this vulnerability maps to techniques found in the MITRE ATT&CK framework related to Denial of Service attacks against system availability resources. Specifically, it relates to methods used to crash services or systems by exploiting memory corruption flaws without needing elevated privileges. The exploitation scenario typically involves crafting a payload that exceeds the expected buffer size and transmitting it through the interface managed by ccci. Once transmitted, if the receiving end fails to validate the length of the incoming data against the allocated buffer limits, the write operation proceeds beyond safe boundaries. This can lead to stack or heap corruption, ultimately resulting in a system panic or reboot cycle that disrupts normal operations for all users on the device.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements. The primary remediation is the application of the provided patches: ALPS11523478 for MT6880 and MT6890 devices, ALPS11297423 for MT6813, MT6986, MT6982, and MT6980D models, and AUTO00864897 for MT2735 and MT2737 platforms. These patches likely introduce rigorous bounds checking routines that verify input lengths before performing memory write operations within the ccci component. Beyond patching, developers should implement strict input validation policies across all interfaces handling external data to prevent similar flaws in other components. Utilizing static analysis tools during the development phase can help identify missing boundary checks early in the software lifecycle. Additionally, enabling compiler-based security features such as stack protectors and address space layout randomization can mitigate the potential consequences of memory corruption vulnerabilities by making exploitation more difficult even if a flaw exists.