CVE-2026-94146 BioStar BIOS Update Utility IOCTL BSMEM64_W10.sys sub_110BC write-what-where
Local attackers can exploit a write-what-where vulnerability in the BIOS Update Utility driver to achieve privilege escalation or code execution.
- 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-2026-94146?
CVE-2026-94146 is a critical memory corruption vulnerability in BioStar BIOS Update Utility, published on 21 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability was found in BioStar BIOS Update Utility 1.9.7.3. This issue affects the function sub_110BC of the file BSMEM64_W10.sys of the component IOCTL Handler. The manipulation of the argument PhysicalAddress/Size results in write-what-where condition. Attacking locally is a requirement. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-94146?
How do I fix CVE-2026-94146?
No fix has been published for CVE-2026-94146 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-94146 being exploited?
There is no known exploitation of CVE-2026-94146 in the wild and no public exploit code.
Sources
Also known as GHSA-3wfp-66vf-pgv2.