Buffer overflow in Mediatek, Inc. Mediatek Chipset
CVE-2026-20509
In Power HAL, there is a possible out of bounds write due to a missing bounds check. 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: ALPS11165543; Issue ID: MSV-9011.
Vulnerability class: Buffer Overflow
CVSS v3 metric
CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Mediatek, Inc. Mediatek Chipset — versions MT2718, MT6739, MT6761
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20509?
- CVE-2026-20509 is a medium-severity vulnerability in Mediatek, Inc. Mediatek Chipset, classified under Stack-based Buffer Overflow. CVSS score: 6.7/10. Published 2026-09-07.
- How severe is CVE-2026-20509?
- Medium severity. CVSS v3 base score is 6.7 out of 10.