What is CVE-2026-90891?

CVE-2026-90891 is a medium-severity vulnerability, classified under CWE-1256. CVSS score: 5.5/10. Published 2026-09-14.

How severe is CVE-2026-90891?

Medium severity. CVSS v3 base score is 5.5 out of 10.

CVE-2026-90891

CVE-2026-90891

ASRock Polychrome SYNC/RGB software utility developed by ASRock Inc. has an Improper Access Control vulnerability. Authenticated local attackers can send a specially crafted IOCTL request to cause the driver to write to improperly restricted I/O ports, resulting in a forced operating system reboot.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Weakness classification (CWE)

CWE-1256

References

twcert@cert.org.tw (third-party-advisory)
twcert@cert.org.tw (third-party-advisory)

Frequently asked questions

What is CVE-2026-90891?: CVE-2026-90891 is a medium-severity vulnerability, classified under CWE-1256. CVSS score: 5.5/10. Published 2026-09-14.
How severe is CVE-2026-90891?: Medium severity. CVSS v3 base score is 5.5 out of 10.