Insyde Security Advisory 2022021

Insyde ID Advisory Category Impact of Vulnerability Severity Rating Original Date Last Revised
INSYDE-SA-2022021 Software AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H 8.2 02/01/2022 02/01/2022


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(QWORD values for CommBuffer). 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-2021-33626. It affects the driver SmmResourceCheckDxe. 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-2021-013) in September 2021. It was fixed in the following Insyde kernel versions on June 1, 2021. Kernel 5.1: 05.16.23 Kernel 5.2: 05.26.23 Kernel 5.3: 05.35.23 Kernel 5.4: 05.43.23 Kernel 5.5: 05.51.23


Insyde Software would like to thank Binarly for reporting this issue.

Revision History:

Revision Date Description
1.0 02/01/2022 Initial Release
- - -

Return to Insyde's Security Pledge