CVE-2025-7026
SMM Arbitrary Write via Unchecked RBX Pointer in CommandRcx0
- State
- Published
- Severity
- 8.2 High
- Published
- Jul 11, 2025
- Updated
- Feb 26, 2026
- Reserved
- Jul 2, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.2 High | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H | CISA-ADP |
Weaknesses
The record names no weakness.
Affected Products
| Product | Versions |
|---|---|
UEFI-GenericComponentSmmEntryGIGABYTE |
|
References
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