Executive Summary
A vulnerability, identified as CVE-2026-20467, has been discovered in MediaTek chipsets that could lead to local escalation of privilege. This vulnerability has a CVSS score of 6, indicating a medium severity level. The vulnerability is not actively exploited and requires the attacker to have already obtained System privilege. Affected products include MT8195, MT8196, and MT8366.
Technical Analysis
The vulnerability is caused by a missing bounds check in the apusys component of MediaTek chipsets. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. The vulnerability has an attack vector of LOCAL, attack complexity of LOW, and requires HIGH privileges. The confidentiality and integrity impacts are HIGH, while the availability impact is NONE.
How It Gets Exploited
An attacker with System privilege on a vulnerable MediaTek chipset could exploit this vulnerability by triggering a specific action that takes advantage of the missing bounds check in apusys. This could potentially allow the attacker to escalate their privileges further. For instance, an attacker might send a specially crafted request to the vulnerable component, which would then fail to validate the input properly, leading to a potential escalation of privilege.
Impact Assessment
The affected products are MediaTek chipsets MT8195, MT8196, and MT8366. An attacker could achieve local escalation of privilege, potentially leading to higher privileges on the system. The CVSS score of 6 indicates a medium severity level.
Recommended Actions
To mitigate this vulnerability, it is recommended to update the affected MediaTek chipsets to a non-vulnerable version. Specifically, users of MT8195, MT8196, and MT8366 should apply the patch provided by MediaTek (Patch ID: AUTO00837766). Additionally, ensuring that only trusted applications have System privilege can reduce the risk of exploitation.
Sources
- National Vulnerability Database (NVD)
- MediaTek Product Security Bulletin