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

Quick assessment

Affected
GIGABYTE UEFI-SmiFlash
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GIGABYTE Chipsets是中国台湾技嘉（GIGABYTE）开源的一系列芯片组。 GIGABYTE Chipsets存在安全漏洞，该漏洞源于未验证指针，可能导致任意读写访问和权限提升。

AI Predicted 7.8 Difficulty: Hard EPSS 0.23% · P14
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I. Basic Information for CVE-2025-7028

Vulnerability Information
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Vulnerability Title
SMM Arbitrary Memory Access via Flash Handler with Unchecked FuncBlock Pointer
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
GIGABYTE Chipsets 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GIGABYTE Chipsets是中国台湾技嘉（GIGABYTE）开源的一系列芯片组。 GIGABYTE Chipsets存在安全漏洞，该漏洞源于未验证指针，可能导致任意读写访问和权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GIGABYTE UEFI-SmiFlash 1.0.0 -

II. Public POCs for CVE-2025-7028

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III. Intelligence Information for CVE-2025-7028

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Same Patch Batch · GIGABYTE · 2025-07-11 · 4 CVEs total

CVE-2025-7029 SMM Arbitrary Write via Unchecked OcHeader Buffer in Platform Configuration Handler
CVE-2025-7026 SMM Arbitrary Write via Unchecked RBX Pointer in CommandRcx0
CVE-2025-7027 SMM Arbitrary Write via Dual-Controlled Pointers in CommandRcx1

IV. Related Vulnerabilities

Same vendor: GIGABYTE