CVE-2025-7026 — SMM Arbitrary Write via Unchecked RBX Pointer in CommandRcx0
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 …
Published: 2025-07-11 · CVSS: 8.2 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7