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CVE-2025-7026

SMM Arbitrary Write via Unchecked RBX Pointer in CommandRcx0

Published: Jul 11, 2025Updated: Nov 3, 2025 Sources: CVE List NVD BDU
NVD MITRE
8.2CVSSHIGH
EPSS Score
0.2%
Top 90.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:LAC:LPR:HUI:NS:CC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Affected Products

UEFI-GenericComponentSmmEntryGIGABYTEHardware Firmware
GA-H110M-S2HPGigabyte Technology Co., Ltd.Hardware Firmware
Z590 GAMING XGigabyte Technology Co., Ltd.Hardware Firmware
H510M S2H V2Gigabyte Technology Co., Ltd.Hardware Firmware
H510M S2HGigabyte Technology Co., Ltd.Hardware Firmware
gigabytecommercialTWHardware Firmwareaka aorus graphics engine, app center, oc guru ii
gigabyte technology co., ltd.commercialTWConsumer Softwareaka gigabyte
and 73 more affected products View all →

Exploitability

Official Patch Available

References

https://kb.cert.org/vuls/id/746790
kb.cert.org
https://www.binarly.io/advisories/brly-dva-2025-008
binarly.io
https://www.gigabyte.com/Support/Security
gigabyte.com
and 3 more references View all →

Timeline

Published
Jul 11, 2025
Last Updated
Nov 3, 2025

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