CVE-2022-32477 Race condition in n/a

High 7.0 Published 15 Feb 2023 Updated 5 May 2025

Attackers can exploit a race condition in InsydeH2O firmware to corrupt SMRAM and escalate privileges, mitigated by enabling IOMMU protection.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2022-32477?

CVE-2022-32477 is a high-severity vulnerability in Insyde Insydeh2o, published on 15 Feb 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. DMA attacks on the FvbServicesRuntimeDxe 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.

Weakness: CWE-367

Which versions are affected by CVE-2022-32477?

It affects 1 product.

Products include Insyde Insydeh2o.

How do I fix CVE-2022-32477?

No fix has been published for CVE-2022-32477 yet. Limit exposure of the affected software until one is available.

Is CVE-2022-32477 being exploited?

There is no known exploitation of CVE-2022-32477 in the wild and no public exploit code.

All Insyde Insydeh2o vulnerabilities

Sources

Also known as GHSA-633w-9qcg-g8vx.