CVE-2026-20535

Analyzed Analyzed - Analysis Complete

Privilege Escalation in AIDL Due to Missing Permission Check

Publication date: 2026-10-05

Last updated on: 2026-10-09

Assigner: MediaTek, Inc.

Description

In aidl, there is a possible escalation of privilege due to a missing permission 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: ALPS11185216; Issue ID: MSV-9039.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-05

Last Modified

2026-10-09

Generated

2026-10-19

AI Q&A

2026-10-05

EPSS Evaluated

2026-10-18

NVD

CVE-2026-20535

EUVD

EUVD-2026-92188

Affected Vendors & Products

Vendor	Product	Version / Range
mediatek	mt8910_firmware	*
mediatek	mt6878_firmware	*
mediatek	mt6881_firmware	*
mediatek	mt6899_firmware	*
mediatek	mt6989_firmware	*
mediatek	mt6991_firmware	*
mediatek	mt6993_firmware	*
mediatek	mt8188_firmware	*
mediatek	mt8189_firmware	*
mediatek	mt8668_firmware	*
mediatek	mt8781_firmware	*
mediatek	mt8793_firmware	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-862	The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

Executive Summary

This vulnerability in aidl allows a local attacker with System privilege to escalate their privileges further. It occurs due to a missing permission check, enabling unauthorized actions without user interaction.

Detection Guidance

Detection of CVE-2026-20535 requires checking for missing permission checks in the AIDL component of MediaTek devices. Since this is a local privilege escalation vulnerability, inspect system logs for unauthorized privilege changes or access attempts. No specific commands are provided in the context, but monitoring for unusual System privilege escalations or reviewing MediaTek AIDL component permissions may help.

Impact Analysis

If exploited, this vulnerability could allow an attacker to gain higher privileges on your device, potentially accessing sensitive data or performing unauthorized actions. It requires the attacker to already have System privilege.

Compliance Impact

The provided CVE data does not specify any direct impact on compliance with standards like GDPR or HIPAA. The vulnerability involves a missing permission check in aidl leading to potential privilege escalation, but no details are given about data exposure or regulatory implications.

Mitigation Strategies

Apply the patch identified as ALPS11185216 to address the missing permission check in aidl. Ensure the System privilege is properly restricted to prevent local escalation of privilege.

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