MediaTek Video HAL Priv Escalation via Missing Bounds Check
CVE-2026-20521 Published on October 5, 2026
In Video HAL, there is a possible escalation of privilege due to a missing bounds check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS11375674; Issue ID: MSV-9571.
Vulnerability Analysis
CVE-2026-20521 can be exploited with local system access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Stack Overflow Vulnerability?
A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
CVE-2026-20521 has been classified to as a Stack Overflow vulnerability or weakness.
Affected Versions
MediaTek, Inc. MediaTek chipset:- Version MT2718 is affected.
- Version MT6768 is affected.
- Version MT6769 is affected.
- Version MT6781 is affected.
- Version MT6789 is affected.
- Version MT6833 is affected.
- Version MT6835 is affected.
- Version MT6853 is affected.
- Version MT6855 is affected.
- Version MT6858 is affected.
- Version MT6877 is affected.
- Version MT6878 is affected.
- Version MT6879 is affected.
- Version MT6881 is affected.
- Version MT6883 is affected.
- Version MT6885 is affected.
- Version MT6886 is affected.
- Version MT6889 is affected.
- Version MT6893 is affected.
- Version MT6895 is affected.
- Version MT6897 is affected.
- Version MT6899 is affected.
- Version MT6983 is affected.
- Version MT6985 is affected.
- Version MT6989 is affected.
- Version MT6991 is affected.
- Version MT6993 is affected.
- Version MT8126 is affected.
- Version MT8171 is affected.
- Version MT8186 is affected.
- Version MT8188 is affected.
- Version MT8189 is affected.
- Version MT8195 is affected.
- Version MT8196 is affected.
- Version MT8367 is affected.
- Version MT8391 is affected.
- Version MT8395 is affected.
- Version MT8668 is affected.
- Version MT8676 is affected.
- Version MT8678 is affected.
- Version MT8695 is affected.
- Version MT8696 is affected.
- Version MT8781 is affected.
- Version MT8788E is affected.
- Version MT8792 is affected.
- Version MT8793 is affected.
- Version MT8799 is affected.
- Version MT8910 is affected.