CVE-2026-20514 Overview
CVE-2026-20514 is an information disclosure vulnerability in the MediaTek Audio Hardware Abstraction Layer (HAL). The flaw stems from a missing permission check that allows a local attacker with System privilege to read sensitive information without additional authorization. Exploitation requires no user interaction. MediaTek tracks the fix under Patch ID ALPS11087632 and Issue ID MSV-8244.
Critical Impact
A local actor holding System-level privilege can access information exposed by the Audio HAL that should require an additional permission check, resulting in local information disclosure on affected MediaTek-based devices.
Affected Products
- MediaTek chipsets exposing the vulnerable Audio HAL component
- Android devices integrating MediaTek platform software prior to Patch ID ALPS11087632
- Refer to the MediaTek Security Bulletin September 2026 for the specific chipset and Android version matrix
Discovery Timeline
- 2026-09-07 - CVE-2026-20514 published to the National Vulnerability Database
- 2026-09-08 - Last updated in NVD database
Technical Details for CVE-2026-20514
Vulnerability Analysis
The defect resides in MediaTek's Audio HAL, the userspace abstraction that mediates between the Android audio framework and vendor-specific audio hardware. A code path within the HAL fails to enforce a required permission check before returning data to the caller. As a result, callers running with the Android System privilege can retrieve information that a proper capability check would otherwise gate.
The vulnerability is categorized under [CWE-307], reflecting an improper restriction on access to a protected resource. Exploitation is local and does not require user interaction. The scope is limited to information disclosure; integrity and availability are not affected.
Root Cause
The root cause is a missing authorization check inside a MediaTek Audio HAL interface. Code that services audio-related requests exposes readable state without verifying that the invoking process holds the permission intended to gate that state. Because the check is absent rather than incorrectly implemented, any caller reaching the interface with the required System privilege inherits access to the protected data.
Attack Vector
An attacker must first obtain System privilege on the target device, typically by chaining a separate privilege-escalation flaw or by compromising a system-context process. From that position, the attacker invokes the affected Audio HAL interface directly and receives sensitive data that the missing permission check would otherwise deny. No physical access, network reachability, or user interaction is required.
No public exploit code, proof-of-concept, or evidence of exploitation in the wild has been published for CVE-2026-20514. The EPSS probability is 0.104%.
No verified proof-of-concept code is available. See the MediaTek Security Bulletin September 2026 for vendor technical detail.
Detection Methods for CVE-2026-20514
Indicators of Compromise
- Unexpected system-context processes invoking Audio HAL interfaces outside of normal media playback or capture workflows
- Presence of unpatched MediaTek platform builds where the fingerprint or vendor patch level predates Patch ID ALPS11087632
- Audit records showing repeated queries against Audio HAL endpoints from non-media system processes
Detection Strategies
- Inventory Android endpoints and identify devices whose vendor security patch level is earlier than the MediaTek September 2026 bulletin.
- Correlate mobile telemetry to flag processes running as System that interact with audio HAL binder interfaces without a legitimate media use case.
- Track privilege-escalation alerts on mobile endpoints, since exploitation of CVE-2026-20514 requires prior System-level compromise.
Monitoring Recommendations
- Ingest mobile device management (MDM) and Android security patch level data into your SIEM to continuously surface devices missing the September 2026 MediaTek patches.
- Monitor for anomalous binder transactions targeting audio HAL services from processes that do not normally handle audio.
- Alert on the co-occurrence of System-privilege escalation events and subsequent access to sensitive HAL interfaces.
How to Mitigate CVE-2026-20514
Immediate Actions Required
- Apply the vendor security patch corresponding to Patch ID ALPS11087632 as delivered through the device OEM update channel.
- Prioritize patching for devices that process sensitive audio data or operate in high-risk environments.
- Enforce OS and vendor patch level compliance through MDM policy, quarantining devices that fall behind the September 2026 baseline.
Patch Information
MediaTek addressed the missing permission check in Patch ID ALPS11087632, referenced as Issue ID MSV-8244. The fix is distributed to device OEMs and must be integrated into each vendor's Android security patch level release. Consult the MediaTek Security Bulletin September 2026 and the corresponding OEM advisory for exact firmware versions.
Workarounds
- No official workaround has been published by MediaTek; applying the vendor patch is the supported remediation.
- Reduce the attack surface by restricting installation of untrusted applications and by hardening system-context services against privilege escalation.
- Retire or isolate end-of-life devices that will not receive the MediaTek September 2026 patch.
# Verify Android vendor security patch level on a managed device
adb shell getprop ro.vendor.build.security_patch
adb shell getprop ro.build.version.security_patch
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
