CVE-2025-7026SMM Arbitrary Write via Unchecked RBX Pointer in CommandRcx0

Descripción

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.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

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