CVE-2026-90891

ASRock｜ASRock Polychrome SYNC/RGB software utility - Improper Access Control

Published Sep 14, 2026 CVSS 4.0 · 6.8 Medium EPSS < 1% KEV · Not listed

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.

Analysis

Technical impact

The vulnerability is an Improper Access Control flaw in ASRock Polychrome SYNC/RGB software. Authenticated local attackers can send a crafted IOCTL request that causes the driver to write to restricted I/O ports, resulting in a forced operating system reboot. This leads to denial of service for affected machines.

Affected Systems

ASRock Polychrome SYNC/RGB for Motherboards (updates later than 1.0.118) and ASRock Polychrome SYNC/RGB for VGA (updates later than 2.0.219).

Risk and Exploitability

The CVSS score of 6.8 indicates moderate severity. The EPSS score of <1% suggests a very low likelihood of exploitation in the wild. The vulnerability is not listed in CISA KEV. The attack requires an attacker to have local authenticated access and to send a specially crafted IOCTL request. No remote exploitation path is known. When the driver writes to an improperly protected I/O port, the system immediately reboots, causing a denial of service until the machine comes back online.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

ASRock

ASRock Polychrome SYNC/RGB for MB

unaffected

Version	Status	Constraints
`0`	affected	≤ 1.0.118

ASRock

ASRock Polychrome SYNC/RGB for VGA

unaffected

Version	Status	Constraints
`0`	affected	≤ 2.0.219

No data.

Vendor Product Versions

Asrock

Asrock Polychrome Sync/rgb For Mb

Version	Status	Scheme	Platform
`[0,1.0.118]`	affected	generic	—

Asrock

Asrock Polychrome Sync/rgb For Vga

Version	Status	Scheme	Platform
`[0,2.0.219]`	affected	generic	—

Remediation

Vendor Solution

Update ASRock Polychrome SYNC/RGB for MB to a version later than 1.0.118 Update ASRock Polychrome SYNC/RGB for VGA to a version later than 2.0.219

OpenCVE Recommended Actions

Update ASRock Polychrome SYNC/RGB for Motherboards to a version newer than 1.0.118.
Update ASRock Polychrome SYNC/RGB for VGA to a version newer than 2.0.219.
Restrict local users’ privileges or disable the Polychrome utility on critical systems to limit the ability of an attacker to issue the vulnerable IOCTL calls.

Generated by OpenCVE AI on September 15, 2026 at 14:59 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.125% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

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

History

Sep 17, 2026 8:30 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Asrock Asrock asrock Polychrome Sync/rgb For Mb Asrock asrock Polychrome Sync/rgb For Vga
Vendors & Products		Asrock Asrock asrock Polychrome Sync/rgb For Mb Asrock asrock Polychrome Sync/rgb For Vga

Sep 14, 2026 12:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Sep 14, 2026 10:45 AM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		ASRock｜ASRock Polychrome SYNC/RGB software utility - Improper Access Control
Weaknesses		CWE-1256
References		https://www.twcert.org.tw/en/cp-139-11204-6b1c6-2.html https://www.twcert.org.tw/tw/cp-132-11205-f6677-1.html
Metrics		cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}` cvssV4_0 `{'score': 6.8, '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'}`