Vulnerability · Published Jul 11, 2025 · Assigned by certcc
CVE-2025-7027SMM Arbitrary Write via Dual-Controlled Pointers in CommandRcx1
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).
Official description
A vulnerability in the Software SMI handler (SwSmiInputValue 0xB2) allows a local attacker to control both the read and write addresses used by the CommandRcx1 function. The write target is derived from an unvalidated UEFI NVRAM variable (SetupXtuBufferAddress), while the write content is read from an attacker-controlled pointer based on the RBX register. This dual-pointer dereference enables arbitrary memory writes within System Management RAM (SMRAM), leading to potential SMM privilege escalation and firmware compromise.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| GIGABYTE | UEFI-GenericComponentSmmEntry | 1.0.0 |