What’s Vulnerable › Vulnerabilities
CVE-2025-7027: SMM Arbitrary Write via Dual-Controlled Pointers in CommandRcx1
- 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 both the read and write addresses used by the CommandRcx1 function. The write target is derived from an unvalidated UEFI NVRAM variable (SetupXtuBufferAddress), while the write content is read from an attacker-controlled pointer based on the RBX register. This dual-pointer dereference enables arbitrary memory writes within System Management RAM (SMRAM), leading to potential SMM privilege escalation and firmware compromise.
Affected products
References
- https://kb.cert.org/vuls/id/746790
- https://www.binarly.io/advisories/brly-2025-009
- https://www.gigabyte.com/Support/Security
- https://www.kb.cert.org/vuls/id/746790
Get alerted when CVE-2025-7027 or the next vulnerability affects your stack