CVE-2022-32476

Severity: high (CVSS 7.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-02-15 · updated 2026-06-17
Weakness: CWE-367

Description

An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. DMA attacks on the AhciBusDxe shared buffer used by SMM and non-SMM code could cause TOCTOU race-condition issues that could lead to corruption of SMRAM and escalation of privileges. This attack can be mitigated using IOMMU protection for the ACPI runtime memory used for the command buffer. This attack can be mitigated by copying the firmware block services data to SMRAM before checking it.

Affected products

Insydeh2O: from 5.0 before 5.2.05.27.27; from 5.3 before 5.3.05.36.27; from 5.4 before 5.4.05.44.27; from 5.5 before 5.5.05.52.27 — fixed in 5.2.05.27.27, 5.3.05.36.27, 5.4.05.44.27, 5.5.05.52.27

How to fix

Upgrade to a fixed version: Insydeh2O 5.2.05.27.27, 5.3.05.36.27, 5.4.05.44.27, 5.5.05.52.27. Check the vendor advisory for mitigations.

References

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