
CVE-2025-7026 – SMM Arbitrary Write via Unchecked RBX Pointer in CommandRcx0
https://notcve.org/view.php?id=CVE-2025-7026
11 Jul 2025 — 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. • https://kb.cert.org/vuls/id/746790 •

CVE-2025-7027 – SMM Arbitrary Write via Dual-Controlled Pointers in CommandRcx1
https://notcve.org/view.php?id=CVE-2025-7027
11 Jul 2025 — A vulnerability in the Software SMI handler (SwSmiInputValue 0xB2) allows a local attacker to control both the read and write addresses used by the CommandRcx1 function. The write target is derived from an unvalidated UEFI NVRAM variable (SetupXtuBufferAddress), while the write content is read from an attacker-controlled pointer based on the RBX register. This dual-pointer dereference enables arbitrary memory writes within System Management RAM (SMRAM), leading to potential SMM privilege escalation and firm... • https://kb.cert.org/vuls/id/746790 •