This vulnerability (CVE-2026-20493) involves an out-of-bounds write in the WiFi component of MediaTek chipsets MT6890, MT6988, and MT6990 due to a missing bounds check. An attacker with System privileges can exploit this flaw to cause a local denial of service. The vulnerability does not require user interaction for exploitation. No official remediation level or patch information is provided in the available data. The CVSS vector indicates low attack complexity and privileges required at the high level, with no confidentiality or integrity impact but an availability impact.

Successful exploitation can lead to a local denial of service condition on affected MediaTek chipsets. There is no impact on confidentiality or integrity. The attacker must have System privileges to exploit this vulnerability, limiting the scope of potential attackers.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official remediation level or patch links are provided, users should monitor MediaTek's advisories for updates. No specific mitigation steps are indicated in the available data.