CVE-2026-20475 in MT6991
Summary
by MITRE • 08/03/2026
In display, 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: ALPS11004276; Issue ID: MSV-7748.
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Analysis
by VulDB Data Team • 08/03/2026
This vulnerability represents a critical out-of-bounds write condition within the display subsystem that arises from insufficient input validation and bounds checking mechanisms. The flaw exists in the graphics rendering or display management components where memory operations occur without proper boundary verification, allowing arbitrary data to be written beyond allocated memory regions. The vulnerability specifically manifests when processing display-related commands or data structures that are passed through system interfaces, creating potential for memory corruption attacks.
The technical implementation of this vulnerability stems from a missing validation check that should occur before any memory write operations targeting display buffers or graphics memory areas. This type of flaw typically falls under the CWE-787 category for out-of-bounds writes, which is classified as a serious weakness in software security practices that can lead to system compromise when exploited correctly. The vulnerability requires no user interaction for exploitation, making it particularly dangerous as it can be triggered automatically through system-level operations or by malicious code already operating with elevated privileges.
The operational impact of this vulnerability becomes significant when considering the privilege escalation potential it provides within a compromised system. While the exploit requires pre-existing System privileges to initiate, the out-of-bounds write condition creates opportunities for attackers to manipulate memory layouts and potentially escalate their privileges beyond the initial system level access. This represents a serious concern for systems where display functionality is heavily integrated with core operating system components, as it could allow malicious actors to gain elevated control over graphics subsystems or even broader system access.
From an attack perspective this vulnerability aligns with ATT&CK technique T1068 which involves privilege escalation through local exploits, and specifically relates to the use of memory corruption techniques within system-level processes. The patch identifier ALPS11004276 suggests this is a mobile or embedded system vulnerability, likely affecting Android-based platforms where display subsystems are integrated with core system services. The issue ID MSV-7748 indicates Microsoft's internal tracking of the vulnerability, suggesting potential cross-platform implications or similar issues in related systems.
Mitigation strategies should prioritize immediate patch application to address the bounds checking deficiency in display subsystem components. System administrators should also implement additional monitoring for anomalous memory access patterns and unusual graphics processing activities that might indicate exploitation attempts. Memory protection mechanisms such as stack canaries, address space layout randomization, and data execution prevention should be enabled to complicate exploitation attempts. Network segmentation and least privilege principles should be maintained to limit the potential impact if other system components are compromised through this vulnerability, particularly in environments where display services are exposed to untrusted inputs or remote access scenarios.