Insyde Security Advisory 2022002

Insyde ID Advisory Category Impact of Vulnerability Severity Rating Original Date Last Revised
INSYDE-SA-2022002 Software AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H 8.2 01/04/2022 01/04/2022


A vulnerability exists in SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently check or validate the allocated buffer pointer(status code saved at CommBuffer+4 location). This can be used by an attacker to corrupt data in SMRAM memory and even lead to arbitrary code execution.

Vulnerability Details


This corresponds to CVE-2021-45970. It affects the driver IdeBusDxe. This issue was discovered by Insyde engineering during an internal security review of several Insyde drivers and entered as a security incident on May 28, 2021. It was independently reported by Binaryly (BRLY-2021-015) in September 2021. It was fixed in the following Insyde kernel versions on June 18, 2021. It was fixed in the following Insyde kernel versions: Kernel 5.1: 05.16.25 Kernel 5.2: 05.26.25 Kernel 5.3: 05.35.25 Kernel 5.4: 05.43.25 Kernel 5.5: 05.51.25. This issue was previously reported incorrectly as part of CVE-2020-27339.

Revision History:

Revision Date Description
1.0 01/04/2022 Initial Release
1.1 02/08/2022 Added CVSS Rating

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