CVE-2026-20451 Memory corruption in MediaTek chipset

Medium 6.7 Published 4 May 2026 Updated 5 May 2026

A type confusion flaw in MediaTek chipset firmware allows local privilege escalation for attackers with System privileges.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-20451?

CVE-2026-20451 is a medium-severity memory corruption vulnerability in MediaTek, Inc. MediaTek chipset, published on 4 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In slbc, there is a possible out of bounds write due to type confusion. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10828685; Issue ID: MSV-6504.

Weakness: CWE-843

Which versions are affected by CVE-2026-20451?

It affects 32 products.

Products include Mediatek Mt2718 Firmware, Mediatek Mt6899 Firmware, Mediatek Mt6985 Firmware, Mediatek Mt6989 Firmware, Mediatek Mt6991 Firmware, Mediatek Mt8115 Firmware and 26 more.

How do I fix CVE-2026-20451?

No fix has been published for CVE-2026-20451 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-20451 being exploited?

There is no known exploitation of CVE-2026-20451 in the wild and no public exploit code.

Sources

Also known as GHSA-gx35-9jr2-9663.