CVE-2026-21024: Samsung System Support Escalation Flaw

CVE-2026-21024 Overview

CVE-2026-21024 is an improper privilege management vulnerability in the Samsung System Support Service. The flaw exists in versions prior to 8.0.8.0 and allows local attackers to trigger privileged functions without proper authorization. Samsung disclosed the issue through its May 2026 Mobile Security Maintenance Release. The vulnerability requires local access and low privileges, but successful exploitation can affect downstream system components beyond the vulnerable service itself.

Critical Impact

Local attackers with low-privileged access on affected Samsung devices can invoke privileged functions exposed by the System Support Service, leading to high-impact effects on subsequent system components.

Affected Products

• Samsung System Support Service versions prior to 8.0.8.0
• Samsung mobile devices shipping the System Support Service component
• Samsung software ecosystems dependent on the System Support Service for privileged operations

Discovery Timeline

• 2026-05-13 - CVE-2026-21024 published to NVD
• 2026-05-13 - Last updated in NVD database

Technical Details for CVE-2026-21024

Vulnerability Analysis

The vulnerability is an improper privilege management issue within the Samsung System Support Service. The service exposes privileged functions that should be restricted to authorized callers. Because of inadequate privilege enforcement, a local attacker with low-level access can invoke these functions and influence operations that should require elevated rights.

The CVSS 4.0 vector indicates the attack is local with low complexity and requires no user interaction. While the direct confidentiality and integrity impact on the vulnerable component is limited, the subsequent system impact is high across confidentiality, integrity, and availability. This pattern suggests the privileged functions can affect components outside the immediate trust boundary of the System Support Service.

Root Cause

The root cause is missing or insufficient privilege checks on entry points exposed by the Samsung System Support Service. Functions intended for privileged callers are reachable from a local low-privileged context. The service does not validate whether the caller possesses the rights required to execute the requested operation.

Attack Vector

Exploitation requires local access to an affected Samsung device and a low-privileged execution context, such as an installed application. The attacker invokes the exposed interfaces of the Samsung System Support Service and triggers privileged functions. No user interaction is required. Refer to the Samsung Mobile Security Service advisory for component-level technical details.

// No verified proof-of-concept code is publicly available for CVE-2026-21024.
// Refer to the Samsung Mobile Security Service advisory for technical details.

Detection Methods for CVE-2026-21024

Indicators of Compromise

• Unexpected invocations of Samsung System Support Service interfaces from non-system applications.
• Local applications performing actions that normally require elevated system privileges on Samsung devices.
• Installed packages with the System Support Service reporting a version prior to 8.0.8.0.

Detection Strategies

• Inventory Samsung devices and identify those running System Support Service versions earlier than 8.0.8.0.
• Audit application install logs and runtime behavior for low-privileged apps that interact with system services.
• Correlate privilege-sensitive operations on Samsung endpoints with the originating application identifier and signature.

Monitoring Recommendations

• Enroll Samsung mobile devices in a mobile device management platform and monitor patch level compliance.
• Track installations of unvetted applications that could serve as a local foothold for triggering the vulnerable service.
• Forward mobile security telemetry to a centralized analytics platform to identify anomalous service interactions over time.

How to Mitigate CVE-2026-21024

Immediate Actions Required

• Update the Samsung System Support Service to version 8.0.8.0 or later through the May 2026 Samsung Mobile Security Maintenance Release.
• Apply pending Samsung security updates across the device fleet through your mobile device management platform.
• Restrict installation of untrusted applications that could provide the local access required for exploitation.

Patch Information

Samsung addressed the vulnerability in System Support Service version 8.0.8.0. Details are published in the May 2026 maintenance release notes available at the Samsung Mobile Security Service advisory portal.

Workarounds

• Enforce application allowlisting policies on managed Samsung devices to limit which apps can run locally.
• Require devices to install the latest Samsung security maintenance release before granting access to sensitive resources.
• Review and tighten device compliance baselines so unpatched Samsung devices are flagged for remediation.

# Verify the Samsung System Support Service version on a managed device
adb shell dumpsys package com.samsung.android.app.systemsupport | grep versionName