What’s Vulnerable › Vulnerabilities
CVE-2025-7026: SMM Arbitrary Write via Unchecked RBX Pointer in CommandRcx0
- Severity: high (CVSS 8.2 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-07-11 · updated 2026-06-17
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.
Affected products
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
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