CVE-2025-7026

SMM Arbitrary Write via Unchecked RBX Pointer in CommandRcx0

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.

8.2

CVSS

Severity: High

CVSS 3.1 •

Affected: GIGABYTE UEFI-GenericComponentSmmEntry

References

Link	Tags
https://www.gigabyte.com/Support/Security
https://www.binarly.io/advisories/brly-dva-2025-008
https://kb.cert.org/vuls/id/746790

Frequently Asked Questions

What is the severity of CVE-2025-7026?: CVE-2025-7026 has been scored as a high severity vulnerability.
How to fix CVE-2025-7026?: To fix CVE-2025-7026, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-7026 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-7026 is being actively exploited.
What software or system is affected by CVE-2025-7026?: CVE-2025-7026 affects GIGABYTE UEFI-GenericComponentSmmEntry.

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