CVE-2022-33905: Insyde Kernel

High severity, CVSS 7.0. EPSS: 0.1% chance of exploitation in the next 30 days.

DMA transactions which are targeted at input buffers used for the AhciBusDxe software SMI handler could cause SMRAM corruption (a TOCTOU attack). DMA transactions which are targeted at input buffers used for the software SMI handler used by the AhciBusDxe driver could cause SMRAM corruption through a TOCTOU attack. This issue was discovered by Insyde engineering based on the general description provided by Intel's iSTARE group, Fixed in kernel 5.2: 05.27.23, kernel 5.3: 05.36.23, kernel 5.4: 05.44.23, kernel 5.5: 05.52.23 https://www.insyde.com/security-pledge/SA-2022047

Affected products

• Insyde Kernel: from 5.2, before 5.2.05.27.23 (fixed in 5.2.05.27.23); from 5.3, before 5.3.05.36.23 (fixed in 5.3.05.36.23); from 5.4, before 5.4.05.44.23 (fixed in 5.4.05.44.23); from 5.5, before 5.5.05.52.23 (fixed in 5.5.05.52.23)

Published 2022-11-15. Last modified 2026-06-17.