What’s Vulnerable › Vulnerabilities

CVE-2025-7028: SMM Arbitrary Memory Access via Flash Handler with Unchecked FuncBlock Pointer

• Severity: high (CVSS 7.8 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 0x20) allows a local attacker to supply a crafted pointer (FuncBlock) through RBX and RCX register values. This pointer is passed unchecked into multiple flash management functions (ReadFlash, WriteFlash, EraseFlash, and GetFlashInfo) that dereference both the structure and its nested members, such as BufAddr. This enables arbitrary read/write access to System Management RAM (SMRAM), allowing an attacker to corrupt firmware memory, exfiltrate SMRAM content via flash, or install persistent implants.

Affected products

• GIGABYTE UEFI-SmiFlash: 1.0.0

References

• https://kb.cert.org/vuls/id/746790
• https://www.binarly.io/advisories/brly-dva-2025-010
• https://www.gigabyte.com/Support/Security
• https://www.kb.cert.org/vuls/id/746790

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