CVE-2026-90891

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreHIGH confidence

Score 5.5 from GitHub Security Advisory published 2026-09-14. a secondary CVSS source baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
5.5
EG Score
5.5(high)
EG Risk
25(Track)
EG Risk 25/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
0%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Sep 14, 2026
No patch confirmed yet. Sources: cert.
cert

ASRock｜ASRock Polychrome SYNC/RGB software utility - 2 Vulnerabilities-TWCERT/CC Taiwan Computer Emergency Response Team/Coordination Center

https://www.twcert.org.tw/en/cp-139-11204-6b1c6-2.html
cert

華擎科技｜ASRock Polychrome SYNC/RGB software utility - 存在2個漏洞-TWCERT/CC台灣電腦網路危機處理暨協調中心|企業資安通報協處|資安情資分享|漏洞通報|資安聯盟|資安電子報

https://www.twcert.org.tw/tw/cp-132-11205-f6677-1.html

Vendor Advisories for CVE-2026-90891(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 16× in last 7d / 16× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-18 19:30 UTCGHSA enrichment
  2. 2026-09-18 08:21 UTCEG score recompute
  3. 2026-09-18 08:21 UTCGHSA enrichment
  4. 2026-09-17 19:32 UTCEPSS rescore
  5. 2026-09-17 09:21 UTCEG score recompute
  6. 2026-09-17 09:21 UTCGHSA enrichment
  7. 2026-09-16 14:09 UTCEPSS rescore
  8. 2026-09-16 10:23 UTCEG score recompute
  9. 2026-09-16 10:23 UTCGHSA enrichment
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-15 11:24 UTCEG score recompute
  12. 2026-09-15 11:24 UTCGHSA enrichment
  13. 2026-09-14 12:26 UTCEG score recompute
  14. 2026-09-14 11:21 UTCEG score recompute
  15. 2026-09-14 10:45 UTCEG score recompute
  16. 2026-09-14 10:44 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-90891?
CVE-2026-90891 is a medium vulnerability published on September 14, 2026. 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.
When was CVE-2026-90891 disclosed?
CVE-2026-90891 was first published in the National Vulnerability Database on September 14, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90891 actively exploited?
CVE-2026-90891 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 99.6% of all scored CVEs.
What is the CVSS score of CVE-2026-90891?
CVE-2026-90891 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-90891?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-90891, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-90891

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