# CVE-2026-20454: MediaTek GenieZone out of bounds write via race condition

Source: https://junglewise.ai/threats/cve-2026-20454-mediatek-geniezone-out-of-bounds-write-via-race-condition  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-01. Updated: 2026-06-01  
License: CC BY 4.0 with a link back

CVE-2026-20454 · Severity: info · Published 2026-06-01

A security vulnerability exists in MediaTek's GenieZone, a secure execution environment component. A malicious actor who has already gained high-level 'System' privileges on a device could exploit a timing-related flaw to gain even deeper control over the system. This could allow an attacker to bypass security boundaries and maintain persistent, unauthorized access to the device's most sensitive operations.

Technologies: [MediaTek GenieZone](https://junglewise.ai/threats/technologies/geniezone). Vendors: [MediaTek](https://junglewise.ai/threats/vendors/mediatek).

## Quick answers

**Is CVE-2026-20454 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-20454 being exploited in the wild.

**How severe is CVE-2026-20454?** Informational severity, published 1 June 2026.

**Which products and versions are affected?** MediaTek GenieZone.

**Is there a fix for CVE-2026-20454?** 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-2026-20454 attacked?** It is attacked with local access, in device firmware.

**Am I affected by CVE-2026-20454?** Check whether you run MediaTek GenieZone. 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

A race condition (CWE-367: Time-of-check Time-of-use) exists within the MediaTek GenieZone environment. The vulnerability stems from improper synchronization that allows an out-of-bounds write operation. To exploit this, an attacker must already have 'System' level privileges on the local device. Successful exploitation allows for further escalation of privilege within the secure environment. No user interaction is required for exploitation. MediaTek has released a fix under Patch ID ALPS10873936.

## Affected products

- MediaTek GenieZone

## Timeline

- 2026-06-01: disclosed
- 2026-06-01: advisory

## References

- [https://corp.mediatek.com/product-security-bulletin/June-2026](https://corp.mediatek.com/product-security-bulletin/June-2026)

## Related threats

- [MediaTek Geniezone information disclosure via missing bounds check](https://junglewise.ai/threats/cve-2026-20518-mediatek-geniezone-information-disclosure-via-missing-bounds)
- [MediaTek geniezone use-after-free privilege escalation](https://junglewise.ai/threats/cve-2026-20517-mediatek-geniezone-use-after-free-privilege-escalation)
- [MediaTek geniezone out-of-bounds write](https://junglewise.ai/threats/cve-2026-20481-mediatek-geniezone-out-of-bounds-write)
- [MediaTek GenieZone out-of-bounds write privilege escalation](https://junglewise.ai/threats/cve-2026-20455-mediatek-geniezone-out-of-bounds-write-privilege-escalation)
- [MediaTek GenieZone out-of-bounds write privilege escalation](https://junglewise.ai/threats/cve-2026-20453-mediatek-geniezone-out-of-bounds-write-privilege-escalation)