CVE-2021-41839: Insyde INSYDEH2O

High severity, CVSS 8.2. EPSS: 0.3% chance of exploitation in the next 30 days.

An issue was discovered in NvmExpressDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O. Because of an Untrusted Pointer Dereference that causes SMM memory corruption, an attacker may be able to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.

Affected products

• Insyde INSYDEH2O: from 5.1, before 5.16.25 (fixed in 5.16.25); from 5.2, before 5.26.25 (fixed in 5.26.25); from 5.3, before 5.35.25 (fixed in 5.35.25); from 5.4, before 5.43.25 (fixed in 5.43.25); from 5.5, before 5.51.25 (fixed in 5.51.25)

Published 2022-02-03. Last modified 2026-08-11.