CVE-2022-31243: Insyde Kernel

Medium severity, CVSS 6.4. EPSS: 0.2% chance of exploitation in the next 30 days.

Update description and links DMA transactions which are targeted at input buffers used for the software SMI handler used by the FvbServicesRuntimeDxe driver could cause SMRAM corruption through a TOCTOU attack.. "DMA transactions which are targeted at input buffers used for the software SMI handler used by the FvbServicesRuntimeDxe driver could cause SMRAM corruption. This issue was discovered by Insyde engineering based on the general description provided by Intel's iSTARE group. Fixed in Kernel 5.2: 05.27.21. Kernel 5.3: 05.36.21. Kernel 5.4: 05.44.21. Kernel 5.5: 05.52.21 https://www.insyde.com/security-pledge/SA-2022044

Affected products

• Insyde Kernel: from 5.2, before 5.2.05.27.21 (fixed in 5.2.05.27.21); from 5.3, before 5.3.05.36.21 (fixed in 5.3.05.36.21); from 5.4, before 5.4.05.44.21 (fixed in 5.4.05.44.21); from 5.5, before 5.5.05.52.21 (fixed in 5.5.05.52.21)

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