CVE-2026-20472 in MT6982VB
Summary
by MITRE • 08/03/2026
In TFA, there is a possible out of bounds write due to a missing bounds check. This could lead to local denial of service if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10991467; Issue ID: MSV-7764.
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Analysis
by VulDB Data Team • 08/03/2026
This vulnerability exists within the Trusted Firmware-A (TFA) implementation where a critical out-of-bounds write condition occurs due to insufficient input validation and missing bounds checking mechanisms. The flaw manifests when processing specific input data structures that exceed allocated memory boundaries, potentially allowing arbitrary code execution or system instability. This represents a significant security weakness in the firmware layer that could be exploited by malicious actors who have already established system-level privileges, making it particularly dangerous in environments where privilege escalation has already occurred.
The technical implementation of this vulnerability stems from inadequate parameter validation within the firmware's memory management routines, specifically affecting how the system handles buffer allocations and data processing. The missing bounds check creates a scenario where array indexing operations can access memory locations beyond their intended boundaries, leading to potential memory corruption that may result in system crashes or denial of service conditions. This type of vulnerability aligns with CWE-129, which addresses insufficient input validation, and CWE-787, which covers out-of-bounds write errors. The absence of user interaction requirements for exploitation makes this particularly concerning as it can be triggered automatically without requiring additional attack vectors or social engineering.
From an operational impact perspective, this vulnerability undermines the integrity and availability of systems relying on TFA for secure boot processes and hardware abstraction layer functionality. When exploited, the out-of-bounds write can cause immediate system instability leading to complete denial of service conditions, effectively rendering affected devices non-functional until manual intervention occurs through firmware updates or system resets. The patch ID ALPS10991467 and issue ID MSV-7764 indicate this was specifically addressed by the vendor, but organizations must ensure timely deployment of these fixes across all affected systems to maintain operational security.
The mitigation strategy for this vulnerability requires immediate implementation of the vendor-provided patch while also conducting comprehensive system audits to identify any potential exploitation attempts that may have occurred prior to patch deployment. Security teams should monitor system logs for unusual patterns that might indicate attempted exploitation, particularly focusing on memory-related error conditions or unexpected system crashes. Organizations implementing TFA solutions must establish robust patch management processes to ensure timely deployment of security updates while maintaining detailed documentation of system configurations and firmware versions to facilitate rapid response in case similar vulnerabilities are discovered. This vulnerability demonstrates the critical importance of thorough input validation and bounds checking in firmware implementations, aligning with ATT&CK technique T1068 which covers local privilege escalation and T1499 which covers endpoint denial of service conditions.