Vulnerability · Published Jul 11, 2025 · Assigned by certcc
CVE-2025-7028SMM Arbitrary Memory Access via Flash Handler with Unchecked FuncBlock Pointer
High 7.8
In plain English
A high-severity security flaw in UEFI-SmiFlash from GIGABYTE. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities).
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| GIGABYTE | UEFI-SmiFlash | 1.0.0 |