CVE-2026-21030 Overview
CVE-2026-21030 is an improper access control vulnerability in the MediaTek Audio Hardware Abstraction Layer (HAL) shipped with Samsung Android devices. The flaw exists in builds prior to Samsung Maintenance Release (SMR) Jun-2026 Release 1. A local attacker on an affected Samsung Android device can invoke privileged functions exposed by the Audio HAL without proper authorization checks. The issue impacts Samsung Android 14.0, 15.0, and 16.0 across multiple SMR releases. Samsung addressed the issue in the June 2026 Security Maintenance Release.
Critical Impact
Local attackers can trigger privileged Audio HAL functions on unpatched Samsung Android devices, undermining device integrity and availability at the system level.
Affected Products
- Samsung Android 14.0 (releases prior to SMR Jun-2026 Release 1)
- Samsung Android 15.0 (releases prior to SMR Jun-2026 Release 1)
- Samsung Android 16.0 (releases prior to SMR Jun-2026 Release 1)
Discovery Timeline
- 2026-06-05 - CVE-2026-21030 published to NVD
- 2026-06-06 - Last updated in NVD database
- June 2026 - Samsung releases SMR Jun-2026 Release 1 addressing the issue
Technical Details for CVE-2026-21030
Vulnerability Analysis
The vulnerability resides in the MediaTek Audio HAL component integrated into Samsung Android firmware. The Audio HAL exposes interfaces that mediate access to audio subsystem functionality between userspace processes and the underlying hardware. The component fails to enforce sufficient access control on functions that should be restricted to privileged callers. As a result, a local process running on the device can reach code paths that are intended only for system-level components. CWE classification is recorded as NVD-CWE-noinfo in the National Vulnerability Database, indicating limited public technical detail beyond Samsung's advisory.
Root Cause
The root cause is missing or insufficient caller validation within the MediaTek Audio HAL interface. Privileged functions are invokable by callers that should not satisfy the required privilege boundary. This is consistent with Improper Access Control [CWE-284] patterns commonly observed in vendor HAL implementations, where binder or HIDL/AIDL entry points expose internal operations without checking the calling UID, SELinux context, or required permission.
Attack Vector
Exploitation requires local access to the device. An attacker must already be able to execute code in the context of an installed application or local process on a vulnerable Samsung Android device. No user interaction is required, and no prior privileges on the HAL interface itself are needed. The attacker then issues calls against the exposed Audio HAL entry points to trigger functions that should require elevated privileges, affecting integrity and availability of subsystem components downstream of the HAL.
No public proof-of-concept exploit is available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. See the Samsung Mobile Security Update for the vendor's technical description.
Detection Methods for CVE-2026-21030
Indicators of Compromise
- Unexpected interactions between non-system applications and MediaTek Audio HAL service endpoints on Samsung Android devices.
- Unusual audio subsystem behavior, such as unexplained audio routing changes or service restarts, on devices below SMR Jun-2026 Release 1.
- Installed applications requesting binder interfaces associated with audio HAL functionality outside of normal media playback or recording flows.
Detection Strategies
- Inventory enrolled Samsung Android devices and flag any running Android 14.0, 15.0, or 16.0 builds older than SMR Jun-2026 Release 1.
- Use mobile threat defense or MDM compliance policies to identify devices that have not received the June 2026 Samsung security patch level.
- Review installed third-party applications on managed devices for unexpected use of audio-related native libraries or binder calls.
Monitoring Recommendations
- Track Samsung's monthly security patch level (ro.build.version.security_patch) across the device fleet and alert when it lags the June 2026 release.
- Monitor application install events on managed devices and correlate sideloaded or unsigned applications with elevated risk scoring.
- Forward MDM and EMM telemetry into a centralized analytics platform to detect non-compliant devices and abnormal audio service activity at scale.
How to Mitigate CVE-2026-21030
Immediate Actions Required
- Deploy Samsung SMR Jun-2026 Release 1 (or later) to all affected Samsung Android 14.0, 15.0, and 16.0 devices through carrier or MDM update channels.
- Enforce MDM compliance policies that block corporate access from devices not running the June 2026 security patch level or later.
- Restrict sideloading of applications from untrusted sources to reduce the population of local code capable of invoking the Audio HAL.
Patch Information
Samsung addressed CVE-2026-21030 in SMR Jun-2026 Release 1. Patch availability and rollout details are published in the Samsung Mobile Security Update bulletin. Administrators should validate that the device security patch level reflects June 2026 or later after update installation.
Workarounds
- No vendor-provided workaround exists; applying the SMR Jun-2026 Release 1 update is the supported remediation.
- Limit installation of untrusted applications and disable installation from unknown sources via MDM until patches are applied.
- Apply conditional access policies that require an up-to-date Samsung security patch level for access to corporate resources.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
