Insyde Security Advisory 2022001

Insyde ID Advisory Category Impact of Vulnerability Severity Rating Original Date Last Revised
INSYDE-SA-2022001 Software AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H 8.2 01/04/2022 02/08/2022


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(CommBufferData). 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-2021-45971. It affects the driver SdHostDriver. 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 Binarly (BRLY-2021-012) in September 2021 It was fixed in the following Insyde kernel versions on June 18, 2021. 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. It 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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