CVE-2025-7028 SMM Arbitrary Memory Access via Flash Handler with Unchecked FuncBlock Pointer
A local attacker can exploit an unchecked pointer in the UEFI SMM handler to achieve arbitrary memory access, enabling firmware corruption or persistent implants.
- 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-2025-7028?
CVE-2025-7028 is a high-severity memory corruption vulnerability in GIGABYTE UEFI-SmiFlash, published on 11 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability in the Software SMI handler (SwSmiInputValue 0x20) allows a local attacker to supply a crafted pointer (FuncBlock) through RBX and RCX register values. This pointer is passed unchecked into multiple flash management functions (ReadFlash, WriteFlash, EraseFlash, and GetFlashInfo) that dereference both the structure and its nested members, such as BufAddr. This enables arbitrary read/write access to System Management RAM (SMRAM), allowing an attacker to corrupt firmware memory, exfiltrate SMRAM content via flash, or install persistent implants.
Which versions are affected by CVE-2025-7028?
How do I fix CVE-2025-7028?
No fix has been published for CVE-2025-7028 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-2025-7028 being exploited?
There is no known exploitation of CVE-2025-7028 in the wild and no public exploit code.
Sources
Also known as GHSA-g4hc-h3h3-22rv.