CVE-2022-33905

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: 2022-11-15 · updated 2026-06-17
Weakness: CWE-367

Description

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; from 5.3 before 5.3.05.36.23; from 5.4 before 5.4.05.44.23; from 5.5 before 5.5.05.52.23 — fixed in 5.2.05.27.23, 5.3.05.36.23, 5.4.05.44.23, 5.5.05.52.23

How to fix

Upgrade to a fixed version: Insyde Kernel 5.2.05.27.23, 5.3.05.36.23, 5.4.05.44.23, 5.5.05.52.23. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2022-33905 or the next vulnerability affects your stack