CVE-2022-33985

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 NvmExpressDxe software SMI handler 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 NvmExpressDxe 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. This issue was fixed in kernel 5.2: 05.27.25, kernel 5.3: 05.36.25, kernel 5.4: 05.44.25, kernel 5.5: 05.52.25 https://www.insyde.com/security-pledge/SA-2022055

Affected products

Insyde Kernel: from 5.2 before 5.2.05.27.25; from 5.3 before 5.3.05.36.25; from 5.4 before 5.4.05.44.25; from 5.5 before 5.5.05.52.25 — fixed in 5.2.05.27.25, 5.3.05.36.25, 5.4.05.44.25, 5.5.05.52.25

How to fix

Upgrade to a fixed version: Insyde Kernel 5.2.05.27.25, 5.3.05.36.25, 5.4.05.44.25, 5.5.05.52.25. Check the vendor advisory for mitigations.

References

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