CVE-2025-7026

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.

Score

CVSS 3.1 8.2 High

Status

Deferred - cret@cert.org

Published

2025-07-11

Last modified

2026-02-26

Affected products

• Uefi-genericcomponentsmmentry (Gigabyte)

References

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