MediaTek WiFi Chipset OOB Write Enables Local DoS
CVE-2026-20493 Published on August 3, 2026
In wifi, there is a possible out of bounds write due to a missing bounds check. This could lead to local denial of service if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: BORA00154903; Issue ID: MSV-7575.
Vulnerability Analysis
CVE-2026-20493 can be exploited with local system access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is a Memory Corruption Vulnerability?
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.
CVE-2026-20493 has been classified to as a Memory Corruption vulnerability or weakness.
Affected Versions
MediaTek, Inc. MediaTek chipset:- Version MT6890 is affected.
- Version MT6988 is affected.
- Version MT6990 is affected.