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 “current_ptr” to read or write or manipulate data into 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-2021-41837

This corresponds to CVE-2021-41837. It affects the AhciBusDxe driver. This issue was discovered by the Binarly efiXplorer team.

The fixed versions of Kernel 5.0: 05.08.41, Kernel 5.1: 05.16.41, Kernel 5.2: 05.26.41, Kernel 5.3: 05.35.41, Kernel 5.4: 05.43.41, Kernel 5.5: 05.51.41

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