CVE-2025-7026
SMM Arbitrary Write via Unchecked RBX Pointer in CommandRcx0
CVSS Score
8.2
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | gigabyte |
| Product | uefi-genericcomponentsmmentry |
| Published | Jul 11, 2025 |
| Last Updated | Feb 26, 2026 |
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Affected Versions
GIGABYTE / UEFI-GenericComponentSmmEntry
1.0.0