What is CVE-2026-20474?

CVE-2026-20474 is a medium-severity vulnerability in Mediatek Mt6991 Firmware, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.0/10. Published 2026-08-03.

How severe is CVE-2026-20474?

Medium severity. CVSS v3 base score is 6.0 out of 10.

Vulnerability in Mediatek Mt6991 Firmware

CVE-2026-20474

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.

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

EPSS: 0.001 (0.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N.

Affected products

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

References

security@mediatek.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-20474?: CVE-2026-20474 is a medium-severity vulnerability in Mediatek Mt6991 Firmware, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.0/10. Published 2026-08-03.
How severe is CVE-2026-20474?: Medium severity. CVSS v3 base score is 6.0 out of 10.