CVE-2026-20533 in MT6739
Summary
by MITRE • 10/05/2026
In display, there is a possible escalation of privilege due to an integer overflow. 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: ALPS11296678; Issue ID: MSV-9167.
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Analysis
by VulDB Data Team • 10/05/2026
The vulnerability identified under issue identifier MSV-9167 and addressed by patch ALPS11296678 represents a critical security flaw within the display subsystem of the affected operating system or device firmware. This specific defect is categorized as an integer overflow, which occurs when an arithmetic operation produces a result that exceeds the maximum value that can be stored in the allocated data type. In the context of modern software architecture and kernel-level operations, such miscalculations often lead to buffer overflows, out-of-bounds memory accesses, or incorrect logic flow decisions. The display subsystem is particularly sensitive because it handles large amounts of graphical data and interacts directly with hardware drivers that operate at high privilege levels. When an integer overflow occurs in this layer, the system may allocate insufficient memory for a buffer intended to hold frame buffer data or other graphics-related structures, leading to corruption of adjacent memory regions.
The classification of this vulnerability as allowing escalation of privilege is significant because it indicates that the flaw can be leveraged by an attacker who has already achieved System-level access to gain further control over the system environment. While the prompt specifies that a malicious actor must have obtained System privilege prior to exploitation, this scenario often arises in complex threat models where initial access might be gained through other vectors such as remote code execution or physical access attacks. Once at the System level, an attacker can manipulate display-related APIs or inject malformed data into the graphics pipeline. The integer overflow allows the attacker to write beyond the bounds of allocated memory, potentially overwriting critical kernel structures, function pointers, or security tokens. This manipulation enables the elevation from a restricted system account to full administrative control or root access, bypassing standard permission checks and isolation mechanisms designed to contain damage within specific user contexts.
From an operational impact perspective, this vulnerability compromises the integrity of the operating system's core components. Although local exploitation is possible without direct user interaction, meaning that automated scripts or background processes could trigger the flaw, the requirement for pre-existing System privileges limits its immediate exploitability by external remote attackers. However, in environments where privilege boundaries are frequently crossed due to misconfigurations or prior compromises, this vulnerability serves as a potent tool for lateral movement and persistence within an enterprise network. An attacker who has compromised a workstation with elevated privileges could use this flaw to establish a more stable foothold, evade detection mechanisms that rely on user-mode monitoring, and potentially access sensitive data stored in kernel memory spaces that are otherwise inaccessible from lower privilege levels.
The technical nature of integer overflows is well-documented within industry standards such as the Common Weakness Enumeration (CWE). This vulnerability aligns closely with CWE-190, which describes Integer Overflow or Wraparound, and potentially CWE-787, Out-of-bounds Write, depending on how the overflow manifests in memory allocation routines. Furthermore, from a tactical perspective related to the MITRE ATT&CK framework, this flaw facilitates techniques associated with Privilege Escalation via Kernel Exploitation (T1068) or Memory Manipulation (T1253). The lack of user interaction required for exploitation places it in categories that favor automated attack tools and worm-like propagation behaviors if the vulnerability were to be exposed to lower privilege levels, although current constraints limit this specific vector.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements. The primary remediation is the application of Patch ID ALPS11296678, which likely includes bounds checking for arithmetic operations within the display driver code and ensures that memory allocations are sized correctly based on validated input parameters. Organizations should prioritize deploying this update across all affected devices to close the privilege escalation vector. Beyond patching, developers should implement static analysis tools during the software development lifecycle to detect integer overflow conditions before deployment. Additionally, enabling hardware-enforced stack protection features such as Stack Canaries and Address Space Layout Randomization (ASLR) can mitigate the impact of memory corruption vulnerabilities by making it significantly harder for attackers to predict memory layouts and execute code injection attacks effectively. Regular security audits focusing on kernel-mode drivers are essential to identify similar weaknesses in other subsystems that interact with system resources at high privilege levels.