CVE-2026-90891 ASRock｜ASRock Polychrome SYNC/RGB software utility - Improper Access Control
Local attackers can trigger a system reboot by sending crafted IOCTL requests to the ASRock Polychrome SYNC/RGB driver due to improper access control.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-90891?
CVE-2026-90891 is a medium-severity missing authorization vulnerability in ASRock Polychrome SYNC/RGB for MB, published on 14 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-1256
Which versions are affected by CVE-2026-90891?
How do I fix CVE-2026-90891?
No fix has been published for CVE-2026-90891 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-90891 being exploited?
There is no known exploitation of CVE-2026-90891 in the wild and no public exploit code.
Sources
Also known as GHSA-g9vq-5jvw-3c63.