← Vulnerability feed

Vulnerability record · CVE-2026-20474 · published 3 August 2026

CVE-2026-20474: Mediatek mt6991 firmware toctou race condition vulnerability

Mediatek · Mt6991 Firmware

In display, there is a possible escalation of privilege due to a race condition. 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: ALPS11019183; Issue ID: MSV-7758.

6.0 CVSS 3.1 Medium EPSS 0.13% · top 97.9% CWE-367 · TOCTOU race condition
6.0CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
17Affected product versions listed by NVD
1References
19 Aug 2026Last modified by NVD

Description

In display, there is a possible escalation of privilege due to a race condition. 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: ALPS11019183; Issue ID: MSV-7758.

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Affected products

17 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.mediatek.com/product-security-bulletin/August-2026 Vendor Advisory

Track CVE-2026-20474 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2026-20433Mediatek mt2735 firmware out-of-bounds write vulnerabilityIn Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege, if a UE has conne…EPSS 0.34%8.4CVE-2026-20501Mediatek mt2718 firmware heap-based buffer overflow vulnerabilityIn vdec, there is a possible out of bounds write due to a heap buffer overflow. This could lead to local escalation of privilege with no additional e…EPSS 0.13%8.4CVE-2026-20502Mediatek mt2718 firmware heap-based buffer overflow vulnerabilityIn vdec, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with no additional e…EPSS 0.13%8.0CVE-2026-20432Mediatek mt2735 firmware out-of-bounds write vulnerabilityIn Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege, if a UE has conne…EPSS 0.29%7.8CVE-2026-20455Mediatek mt6739 firmware out-of-bounds write vulnerabilityIn geniezone, 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 …EPSS 0.11%7.7CVE-2026-20483Mediatek mt8893 firmware missing authorization vulnerabilityIn Telephony, there is a possible escalation of privilege due to a missing permission check. This could lead to local escalation of privilege with no…EPSS 0.17%6.7CVE-2026-20486Mediatek mt8910 firmware vulnerabilityIn imgsensor, there is a possible application crash due to incorrect error handling. This could lead to local escalation of privilege if a malicious …EPSS 0.17%6.7CVE-2026-20453Mediatek mt8673 firmware out-of-bounds write vulnerabilityIn geniezone, 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 …EPSS 0.11%

Source: NIST National Vulnerability Database (record CVE-2026-20474), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.