CVE-2022-33986

Severity: medium (CVSS 6.4 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 attacks on the parameter buffer used by the VariableRuntimeDxe software SMI handler could lead to a TOCTOU attack. DMA attacks on the parameter buffer used by the software SMI handler used by the driver VariableRuntimeDxe could lead to a TOCTOU attack on the SMI handler and lead to corruption of SMRAM. This issue was discovered by Insyde engineering during a security review. This issue is fixed in Kernel 5.4: 05.44.23 and Kernel 5.5: 05.52.23. CWE-367 CWE-367 Report at: https://www.insyde.com/security-pledge/SA-2022056

Affected products

Insyde Kernel: from 5.4 before 5.4.05.44.23; from 5.5 before 5.5.05.52.23 — fixed in 5.4.05.44.23, 5.5.05.52.23

How to fix

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

References

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