CVE-2025-4276 UsbCoreDxe: improper input validation may lead to arbitrary code execution
Attackers can exploit improper input validation in UsbCoreDxe to write arbitrary memory and execute code at SMM level in InsydeH2O firmware.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-4276?
CVE-2025-4276 is a high-severity memory corruption vulnerability in InsydeH2O, published on 13 Aug 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
UsbCoreDxe has a vulnerability which can be used to write arbitrary memory inside SMRAM and execute arbitrary code at SMM level.
Weakness: CWE-20
Which versions are affected by CVE-2025-4276?
How do I fix CVE-2025-4276?
No fix has been published for CVE-2025-4276 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-2025-4276 being exploited?
There is no known exploitation of CVE-2025-4276 in the wild and no public exploit code.
Sources
Also known as GHSA-rx4h-pwfx-x49f.