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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.001 (2.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 2.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000
Weakness classification (CWE)
References
- www.twcert.org.tw/tw/cp-132-11205-f6677-1.html (third-party-advisory)
- www.twcert.org.tw/en/cp-139-11204-6b1c6-2.html (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.