CVE-2026-68589 in MT2716
Summary
by MITRE • 11/02/2026
In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: MOLY01320076; Issue ID: MSV-6889.
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Analysis
by VulDB Data Team • 11/02/2026
The vulnerability identified under issue identifier MSV-6889 and addressed by patch Moly01320076 represents a critical memory safety flaw within the modem subsystem of the affected device architecture. This specific defect is classified as an out-of-bounds write, which occurs when software writes data to a memory location that falls outside the intended buffer boundaries. The root cause of this vulnerability is a missing bounds check in the code responsible for handling incoming or processed data streams within the modem firmware. In modern computing systems, particularly those involving telecommunications hardware like modems, strict adherence to memory allocation limits is essential to prevent corruption of adjacent memory structures. When such checks are omitted, an attacker who can influence the input parameters passed to these functions may cause the application to write beyond the allocated buffer space into neighboring memory regions.
From a technical perspective, this flaw aligns with Common Weakness Enumeration identifier CWE-787, which designates out-of-bounds writes as a severe category of software errors due to their potential for arbitrary code execution or system instability. The modem component typically operates at a high privilege level within the device's operating environment, often interacting directly with kernel-level drivers and hardware registers. Consequently, an attacker who has already achieved local access with System privileges can leverage this memory corruption to overwrite critical data structures such as function pointers, return addresses on the stack, or security-critical flags. This manipulation allows for precise control over program execution flow, facilitating a privilege escalation attack where the malicious actor gains full administrative control over the device beyond what was originally permitted by their initial access level.
The operational impact of this vulnerability is significant because it does not require user interaction to be exploited once local system-level access is established. This characteristic lowers the barrier for exploitation compared to vulnerabilities requiring social engineering or specific UI interactions. An attacker with System privileges, perhaps gained through a separate lower-impact vulnerability such as an insecure file permission configuration or a weak authentication mechanism on a service running at that level, can directly trigger this modem flaw without further user involvement. The ability to escalate privileges from System to potentially higher kernel-level access or full device control enables the actor to install persistent backdoors, exfiltrate sensitive data including cryptographic keys and personal information, and compromise the integrity of other applications running on the same platform.
In terms of threat modeling, this vulnerability maps to techniques found in the MITRE ATT&CK framework, specifically those related to privilege escalation via memory corruption or exploitation of local vulnerabilities within system processes. The lack of user interaction places it firmly in categories describing automated exploitation paths that can be chained with initial access vectors to achieve complete device compromise. Defenders and security engineers should recognize this as a high-severity issue requiring immediate remediation, particularly for devices deployed in environments where physical or logical proximity allows an attacker to gain even minimal foothold privileges on the host system.
Mitigation strategies primarily rely on the deployment of the provided patch Moly01320076, which introduces the necessary bounds checking logic into the modem firmware codebase. This fix ensures that all memory write operations are validated against allocated buffer sizes before execution proceeds. Beyond applying patches, organizations should implement defense-in-depth measures such as enabling hardware-enforced stack protection mechanisms like Stack Canaries or Data Execution Prevention if supported by the device's processor architecture. Additionally, restricting local access to System-level services through strict Access Control Lists and minimizing the attack surface by disabling unnecessary modem features can reduce the likelihood of an attacker reaching the initial foothold required to exploit this vulnerability. Regular security audits focusing on memory safety in C/C++ based firmware components are also recommended to prevent similar defects from being introduced during future development cycles.