CVE-2026-20571 in MT6739
Summary
by MITRE • 11/02/2026
In afe, there is a possible memory corruption due to use after free. 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: ALPS11434319; Issue ID: MSV-9925.
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Analysis
by VulDB Data Team • 11/02/2026
The vulnerability identified under patch identifier ALPS11434319 and issue reference MSV-9925 represents a critical memory safety flaw within the Android Framework Environment, commonly referred to as AFE. This specific defect is classified as a use-after-free condition, which occurs when software continues to utilize a pointer after the memory it references has been deallocated or freed by the system. In the context of modern operating systems and mobile frameworks, such errors are among the most dangerous because they can lead to undefined behavior that attackers can leverage to compromise system integrity. The root cause typically involves a failure in reference counting logic or improper lifecycle management where an object is destroyed while still being referenced by another active component within the framework stack.
From a technical perspective, this use-after-free vulnerability allows for arbitrary code execution capabilities if exploited successfully. When the freed memory block is reallocated for a different purpose before the stale pointer is dereferenced, the attacker can control the data written to that location or read sensitive information from it. This mechanism bypasses standard memory protection boundaries because the operating system assumes the pointer remains valid until explicitly released by the owning process. The absence of user interaction required for exploitation significantly increases the risk profile, as this flaw does not rely on social engineering tactics such as clicking a malicious link or opening a crafted file. Instead, it can potentially be triggered through background processes or network-based interactions that automatically invoke the vulnerable code path within the Android Framework services.
The operational impact of this vulnerability is severe due to its potential for local privilege escalation. Although the prompt notes that exploitation requires an attacker who has already obtained System privileges, in many mobile architectures, achieving initial access at lower privilege levels can serve as a stepping stone toward higher-level compromise through chained exploits or additional logic flaws. If an adversary manages to escalate from a standard application sandbox to system level via this vulnerability combined with other weaknesses, they gain unrestricted read and write access to the device's file system, kernel memory, and sensitive user data including credentials, messages, and location history. This effectively neutralizes the security boundaries designed by Android’s permission model and isolation mechanisms.
This flaw aligns closely with Common Weakness Enumeration identifier CWE-416, which defines use after free as a condition where an application uses a pointer to memory that has already been freed. Furthermore, in terms of offensive cyber operations mapping, this vulnerability facilitates techniques associated with MITRE ATT&CK framework subcategories related to privilege escalation and defense evasion on mobile platforms. Attackers often leverage such memory corruption bugs to bypass sandbox restrictions or execute arbitrary code within the context of a privileged system process, thereby establishing persistent control over the device without triggering typical security alerts that monitor for suspicious user-initiated actions.
Mitigation strategies primarily rely on the timely application of the provided patch ALPS11434319 by device manufacturers and OEMs to update the Android Framework Environment components. For developers integrating or maintaining custom builds, rigorous static analysis tools should be employed during the software development lifecycle to detect dangling pointer usage early in the coding phase. Additionally, implementing Address Sanitizer (ASan) during testing phases can help identify these memory corruption issues before deployment. On the user side, keeping device firmware up to date is critical as it ensures that security patches addressing such low-level framework vulnerabilities are applied promptly. Security teams should also monitor for indicators of compromise related to abnormal system process behavior or unexpected privilege changes which may signal active exploitation attempts targeting this specific flaw in unpatched environments.