CVE-2025-7026

SMM Arbitrary Write via Unchecked RBX Pointer in CommandRcx0

Published: Jul 11, 2025Updated: Nov 3, 2025 Sources: CVE List NVD BDU

8.2HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

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

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Affected Products

Gigabyte Technology Co., Ltd.

commercial·TWaka gigabyte

H410M S2H V2 (rev. 1.9/2.1)

Hardware Firmware

H410M H V2 (rev. 1.9)

Hardware Firmware

GIGABYTE

commercial·TWaka aorus graphics engine, app center, oc guru ii

UEFI-GenericComponentSmmEntry

Hardware Firmware

and 69 more affected products View all →

Exploitability

Official Patch Available

Is your org exposed to CVE-2025-7026?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

References

https://www.gigabyte.com/Support/Security

gigabyte.com

https://www.binarly.io/advisories/brly-dva-2025-008

binarly.io

https://kb.cert.org/vuls/id/746790

kb.cert.org

and 3 more references View all →

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