CVE-2025-7026: high-severity vulnerability in GIGABYTE UEFI-GenericComponentSmmEntry
SMM Arbitrary Write via Unchecked RBX Pointer in CommandRcx0
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.2epss 0.2%
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.
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Affected products
GIGABYTE · UEFI-GenericComponentSmmEntryRelated CVEs — GIGABYTE UEFI-GenericComponentSmmEntry
In the same product, most dangerous first.