# CVE-2026-21030: MediaTek Audio HAL improper access control

Source: https://junglewise.ai/threats/cve-2026-21030-mediatek-audio-hal-improper-access-control  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-05. Updated: 2026-06-05  
License: CC BY 4.0 with a link back

CVE-2026-21030 · Severity: info · CVSS 6.4 · Published 2026-06-05

A security vulnerability exists in the MediaTek audio component used in many mobile devices, which manages how the operating system communicates with audio hardware. An attacker with local access to a device could bypass security controls to trigger sensitive functions that should normally be restricted. This could potentially allow unauthorized changes to system settings or interference with audio operations.

Technologies: [MediaTek Audio HAL](https://junglewise.ai/threats/technologies/audio-hal). Vendors: [MediaTek](https://junglewise.ai/threats/vendors/mediatek).

## Quick answers

**Is CVE-2026-21030 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-21030 being exploited in the wild.

**How severe is CVE-2026-21030?** Informational severity, with a CVSS score of 6.4, published 5 June 2026.

**Which products and versions are affected?** MediaTek Audio HAL prior to SMR Jun-2026 Release 1.

**Is there a fix for CVE-2026-21030?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-21030 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-21030?** Check whether you run MediaTek Audio HAL at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An improper access control vulnerability exists in the MediaTek Audio Hardware Abstraction Layer (HAL). The flaw allows a local attacker to bypass intended permission restrictions and execute privileged functions within the audio subsystem. According to the CVSS 4.0 vector provided by Samsung, the exploit has a high impact on the integrity and availability of the subsequent system (SC:H/SI:H/SA:H), though the initial confidentiality impact is negligible. The issue is addressed in the MediaTek SMR Jun-2026 Release 1 update.

## Affected products

- MediaTek Audio HAL prior to SMR Jun-2026 Release 1

## Timeline

- 2026-06-05: disclosed
- 2026-06-05: advisory

## References

- [https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=06](https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=06)

## Related threats

- [MediaTek Audio HAL information disclosure due to missing permission check](https://junglewise.ai/threats/cve-2026-20514-mediatek-audio-hal-information-disclosure-due-to-missing)
- [MediaTek Audio HAL privilege escalation](https://junglewise.ai/threats/cve-2026-20512-mediatek-audio-hal-privilege-escalation)
- [MediaTek Audio HAL use after free privilege escalation](https://junglewise.ai/threats/cve-2026-20506-mediatek-audio-hal-use-after-free-privilege-escalation)