Vulnerability · Published Jul 11, 2025 · Assigned by certcc
CVE-2025-7026SMM Arbitrary Write via Unchecked RBX Pointer in CommandRcx0
High 8.2
In plain English
A high-severity security flaw in UEFI-GenericComponentSmmEntry 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). Ready-made attack tooling exists: public proof-of-concept code.
Official description
A vulnerability in the Software SMI handler (SwSmiInputValue 0xB2) allows a local attacker to control the RBX register, which is used as an unchecked pointer in the CommandRcx0 function. If the contents at RBX match certain expected values (e.g., '$DB$' or '2DB$'), the function performs arbitrary writes to System Management RAM (SMRAM), leading to potential privilege escalation to System Management Mode (SMM) and persistent firmware compromise.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| GIGABYTE | UEFI-GenericComponentSmmEntry | 1.0.0 |