CVE-2026-20443 in MT6739
Summary
by MITRE • 03/02/2026
In display, 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: ALPS10436998; Issue ID: MSV-5722.
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Analysis
by VulDB Data Team • 03/04/2026
This vulnerability resides within the display subsystem of a mobile operating system and represents a critical use after free condition that can potentially lead to local privilege escalation. The flaw occurs when the system fails to properly manage memory references after objects have been freed, creating opportunities for memory corruption that can be exploited by malicious actors. The vulnerability is particularly concerning because it does not require user interaction for exploitation, making it highly dangerous in environments where system privileges may already be compromised.
The technical implementation of this memory corruption vulnerability stems from improper memory management practices within the display component's code execution flow. When display-related objects are freed from memory but references to them persist, attackers can manipulate these dangling pointers to execute arbitrary code with elevated privileges. This type of vulnerability is classified as a use after free condition under the Common Weakness Enumeration framework, specifically mapping to CWE-416 which addresses the reuse of freed memory. The flaw demonstrates characteristics of a heap-based memory corruption vulnerability that can be leveraged for privilege escalation attacks.
The operational impact of this vulnerability extends beyond simple memory corruption, as it provides a pathway for malicious actors to escalate their privileges from system level to potentially higher privileged states within the operating system. Even though the vulnerability requires an initial foothold through existing system privileges, the fact that no user interaction is needed for exploitation makes it particularly dangerous in persistent threat scenarios. The attack surface is significant since display operations are frequently used by system components and applications, increasing the likelihood of successful exploitation.
Security mitigations for this vulnerability should focus on implementing proper memory management practices and address the specific use after free condition within the display subsystem. The patch ALPS10436998 addresses this issue by ensuring proper memory deallocation and reference management within the display component. Organizations should prioritize immediate deployment of this patch and implement additional monitoring for suspicious memory access patterns. The vulnerability also aligns with attack techniques documented in the MITRE ATT&CK framework under privilege escalation tactics, specifically targeting system service manipulation and memory corruption techniques. System administrators should consider implementing additional security controls such as address space layout randomization and heap integrity checks to further reduce the exploitability of similar memory corruption vulnerabilities.