Insyde's Security Pledge

An unsafe pointer vulnerability exists in SMM (System Management Mode) branch that registers a SWSMI handler. An attacker can use this unsafe pointer “ptr” to read or write or manipulate data in the SMRAM. Exploitation of this vulnerability can lead to escalation of privileges reserved only for SMM using the SwSMI handler.

CVSS Vector: AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVE-2021-41838

This corresponds to CVE-2021-41838. It affects the NvmExpressDxe driver. This issue was discovered by the Binarly efiXplorer team

The fixed versions are Kernel 5.1: 05.16.42, Kernel 5.2: 05.26.42, Kernel 5.3: 05.35.42, Kernel 5.4: 05.43.42, Kernel 5.5: 05.51.42

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