CVE-2026-20456 Memory corruption in MediaTek chipset
A missing bounds check in the MediaTek WLAN STA driver allows local attackers to cause a system crash, requiring user privileges but no interaction.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20456?
CVE-2026-20456 is a medium-severity memory corruption vulnerability in MediaTek, Inc. MediaTek chipset, published on 1 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In wlan STA driver, there is a possible system crash due to a missing bounds check. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00480851; Issue ID: MSV-6338.
Weakness: CWE-787
Which versions are affected by CVE-2026-20456?
It affects 6 products.
Products include Mediatek Mt7902 Firmware, Mediatek Mt7920 Firmware, Mediatek Mt7921 Firmware, Mediatek Mt7922 Firmware, Mediatek Mt7925 Firmware, Mediatek Mt7927 Firmware.
How do I fix CVE-2026-20456?
No fix has been published for CVE-2026-20456 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-2026-20456 being exploited?
There is no known exploitation of CVE-2026-20456 in the wild and no public exploit code.
Other vulnerabilities in MediaTek, Inc. MediaTek chipset
- CVE-2025-20672 Memory corruption in MT7902, MT7921, MT7922, MT7925, MT7927
- CVE-2026-20495 Missing authorization in MediaTek chipset
- CVE-2026-20482 Denial of service in MediaTek chipset
- CVE-2025-20673 Null dereference in MT7902, MT7921, MT7922, MT7925, MT7927
- CVE-2025-20675 Null dereference in MT7902, MT7921, MT7922, MT7925, MT7927
Sources
Also known as GHSA-v8qh-hh5q-9vc3.