CVE-2026-24920: Huawei EMUI Privilege Escalation Flaw

CVE-2026-24920 Overview

CVE-2026-24920 is a permission control vulnerability affecting the Activity Manager Service (AMS) module in Huawei mobile operating systems. The vulnerability stems from improper access control mechanisms within the AMS component, which is responsible for managing application lifecycle and inter-process communication on Android-based systems. Successful exploitation of this vulnerability may allow a local attacker with limited privileges to cause a denial of service condition, impacting device availability.

Critical Impact

Local attackers with low privileges can exploit improper permission controls in the AMS module to disrupt device availability, potentially causing application crashes or system instability.

Affected Products

• Huawei EMUI 14.2.0
• Huawei EMUI 15.0.0
• Huawei HarmonyOS 4.2.0, 4.3.0, 4.3.1

Discovery Timeline

• 2026-02-06 - CVE-2026-24920 published to NVD
• 2026-02-09 - Last updated in NVD database

Technical Details for CVE-2026-24920

Vulnerability Analysis

The vulnerability resides in the Activity Manager Service (AMS) module, a critical Android system component that handles application process management, activity stack control, and inter-component communication. The AMS module is responsible for enforcing permission checks when applications request sensitive operations or access protected resources.

In this case, the permission control mechanism fails to properly validate authorization for certain operations, allowing a local attacker with low-level privileges to trigger actions that should be restricted. The flaw is categorized under CWE-264 (Permissions, Privileges, and Access Controls), indicating a fundamental issue with how the module enforces access control policies.

The attack requires local access to the device, meaning an attacker would need to either have physical access or have already installed a malicious application on the target device. While the vulnerability does not allow data exfiltration or arbitrary code execution, it can be leveraged to exhaust system resources or crash critical system services, resulting in denial of service.

Root Cause

The root cause of CVE-2026-24920 is inadequate permission validation within the AMS module's request handling logic. When processing certain privileged operations, the module fails to verify that the calling process has the necessary permissions or belongs to a sufficiently privileged user group. This oversight allows unprivileged applications to invoke operations that can destabilize the system or interfere with other applications' normal operation.

Attack Vector

The attack vector for this vulnerability is local, requiring an attacker to have code execution capability on the target device. This could be achieved through a malicious application installed by the user, or through another vulnerability that provides initial access.

Once on the device, the attacker can craft specific requests to the AMS module that bypass permission checks. These requests can trigger resource exhaustion, service crashes, or other conditions that degrade system availability. The attack does not require user interaction beyond the initial installation of a malicious application.

Since no verified code examples are available for this vulnerability, the exploitation mechanism involves sending improperly authorized IPC calls to the AMS service. Attackers would leverage standard Android Binder communication interfaces to invoke restricted AMS operations without proper permission validation, causing the service to enter an unstable state or consume excessive resources.

Detection Methods for CVE-2026-24920

Indicators of Compromise

• Unexpected application crashes or system service restarts, particularly involving the Activity Manager Service
• Unusual resource consumption patterns from low-privilege applications attempting to access system services
• Logcat entries showing permission denial errors followed by successful service disruption

Detection Strategies

• Monitor system logs for abnormal AMS-related events including service restarts and permission bypass attempts
• Implement behavioral analysis to detect applications making excessive or unusual calls to system services
• Deploy mobile threat defense solutions capable of identifying privilege escalation or DoS attack patterns

Monitoring Recommendations

• Enable verbose logging for system services to capture detailed permission check events
• Regularly audit installed applications for suspicious permission requests or behavior
• Utilize SentinelOne Singularity Mobile to detect and respond to anomalous application behavior on managed devices

How to Mitigate CVE-2026-24920

Immediate Actions Required

• Update affected devices to the latest EMUI or HarmonyOS version that contains the security patch
• Review installed applications and remove any untrusted or suspicious apps
• Enable automatic security updates to ensure timely patch deployment

Patch Information

Huawei has released security patches addressing this vulnerability in the February 2026 security bulletin. Users should update their devices to the latest available firmware version. Detailed patch information is available in the Huawei Security Bulletin February 2026 and the Huawei BulletinVision Update.

Workarounds

• Limit application installations to trusted sources such as the official Huawei AppGallery
• Disable installation of applications from unknown sources in device settings
• Monitor device behavior for signs of instability that may indicate exploitation attempts

# Verify current EMUI/HarmonyOS version
# Navigate to: Settings > About phone > Build number
# Ensure the security patch level is February 2026 or later

# Disable unknown app sources (recommended)
# Settings > Security > More settings > Install unknown apps > Disable for all apps