A vulnerability classified as problematic was found in insyde Kernel. Affected by this vulnerability is some unknown processing of the component VariableRuntimeDxe. The manipulation with an unknown input leads to a toctou vulnerability. The CWE definition for the vulnerability is CWE-367. The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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

The weakness was published 11/15/2022. The advisory is shared at insyde.com. This vulnerability is known as CVE-2022-33986 since 06/18/2022. Neither technical details nor an exploit are publicly available.

Upgrading to version 05.44.23 or 05.52.23 eliminates this vulnerability.

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• insyde

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• Kernel

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• commercial

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