CVE-2025-7026 SMM Arbitrary Write via Unchecked RBX Pointer in CommandRcx0
Local attackers can exploit an unchecked pointer in GIGABYTE UEFI firmware to write to SMRAM, achieving privilege escalation to System Management Mode.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-7026?
CVE-2025-7026 is a high-severity vulnerability in GIGABYTE UEFI-GenericComponentSmmEntry, published on 11 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2025-7026?
How do I fix CVE-2025-7026?
No fix has been published for CVE-2025-7026 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-7026 being exploited?
There is no known exploitation of CVE-2025-7026 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-g884-34r9-cwxq.