CVE-2022-31243

Severity: medium (CVSS 6.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-11-15 · updated 2026-06-17
Weakness: CWE-367

Description

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; from 5.3 before 5.3.05.36.21; from 5.4 before 5.4.05.44.21; from 5.5 before 5.5.05.52.21 — fixed in 5.2.05.27.21, 5.3.05.36.21, 5.4.05.44.21, 5.5.05.52.21

How to fix

Upgrade to a fixed version: Insyde Kernel 5.2.05.27.21, 5.3.05.36.21, 5.4.05.44.21, 5.5.05.52.21. Check the vendor advisory for mitigations.

References

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