CVE-2026-20576 in MT6789
Summary
by MITRE • 11/02/2026
In afe, 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: ALPS11431385; Issue ID: MSV-9920.
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Analysis
by VulDB Data Team • 11/02/2026
The vulnerability identified under issue identifier MSV-9920 and addressed by patch ALPS11431385 represents a critical memory safety defect within the Android Framework Environment, commonly referred to as afe. This flaw is classified technically as an out-of-bounds write resulting from a missing bounds check during data processing operations. In software engineering terms, this indicates that the application or system component failed to validate the length of input data against the allocated buffer size before writing it into memory. When such validation is absent, maliciously crafted inputs can cause the program to write data beyond the intended boundaries of the designated memory region. This type of error falls squarely under CWE-787: Out-of-bounds Write in the Common Weakness Enumeration taxonomy, which highlights risks associated with improper limitation of a array index or pointer arithmetic that allows writing to unintended memory locations.
The operational impact of this vulnerability is significant due to its potential for local privilege escalation. Although exploitation requires an attacker to already possess System privileges, the ability to perform arbitrary writes in kernel space or high-privilege contexts can destabilize the operating system's integrity and security model. In many Android architectures, achieving System level access often involves exploiting multiple chained vulnerabilities; however, this specific flaw provides a mechanism for further compromising memory safety even at elevated privilege levels. An attacker could potentially overwrite critical function pointers, return addresses, or other control data structures within the kernel or framework processes. This capability aligns with ATT&CK technique T1068: Exploitation for Privilege Escalation, where adversaries leverage software vulnerabilities to gain higher-level access than originally permitted by security policies.
The absence of user interaction in the exploitation chain makes this vulnerability particularly dangerous from an automated attack perspective. Since no human intervention is required to trigger the condition, a malicious actor with System privileges can execute exploits programmatically and silently. This characteristic reduces the barrier for entry significantly compared to vulnerabilities requiring social engineering or specific UI interactions. The lack of user involvement means that once initial access is gained through other vectors such as compromised applications or physical access, this flaw serves as an efficient pathway to deeper system compromise or persistence mechanisms that rely on memory corruption techniques.
Mitigation strategies primarily involve the deployment of the provided patch ALPS11431385 which corrects the underlying code logic by implementing rigorous bounds checking before any write operations occur. Developers must ensure that all array indices and buffer lengths are validated against their respective maximum capacities prior to execution. Beyond immediate patching, long-term resilience can be enhanced through the adoption of memory-safe programming practices and static analysis tools capable of detecting out-of-bounds errors during development phases. Additionally enabling hardware-based security features such as Kernel Memory Protection or ASLR can mitigate the impact by making it more difficult for attackers to predict target addresses even if a write occurs outside bounds. Regular auditing of code paths involving buffer manipulations is essential to prevent recurrence of CWE-787 type defects in future updates.