A potential vulnerability in the SMI callback function used to access flash device in some ThinkPad models may allow an attacker with local access and elevated privileges to execute arbitrary code.

A potential vulnerability in the SMI callback function used in CSME configuration of some Lenovo Notebook and ThinkPad systems could be used to leak out data out of the SMRAM range.

A potential vulnerability in the SMI callback function used in the Legacy SD driver in some Lenovo ThinkPad, ThinkStation, and Lenovo Notebook models may allow arbitrary code execution.

A potential vulnerability in the SMI callback function used in the Legacy USB driver using boot services structure in runtime phase in some Lenovo ThinkPad models may allow arbitrary code execution.

The BIOS tamper detection mechanism was not triggered in Lenovo ThinkPad T460p, BIOS versions up to R07ET90W, and T470p, BIOS versions up to R0FET50W, which may allow for unauthorized access.

A potential vulnerability in the SMI callback function used in Legacy USB driver using passed parameter without sufficient checking in some Lenovo ThinkPad models may allow arbitrary code execution.

There is a vulnerability with the Dolby DAX2 API system services in which a low-privileged user can terminate arbitrary processes that are running at a higher privilege. The following are affected products and versions: Legion Y520T_Z370 6.0.1.8642, AIO310-20IAP 6.0.1.8642, AIO510-22ISH 6.0.1.8642, AIO510-23ISH 6.0.1.8642, AIO520-22IKL 6.0.1.8642, AIO520-22IKU 6.0.1.8642, AIO520-24IKL 6.0.1.8642, AIO520-24IKU 6.0.1.8642, AIO520-27IKL 6.0.1.8642, AIO720-24IKB 6.0.1.8642, IdeaCentre 520S-23IKU 6.0.1.8642, ThinkCentre M700z 6.0.1.8642, ThinkCentre M800z 6.0.1.8642, ThinkCentre M810z 6.0.1.8642, ThinkCentre M818z 6.0.1.8642, ThinkCentre M900Z 6.0.1.8642, ThinkCentre M910z 6.0.1.8642, V410z(YT S4250) 6.0.1.8642, 330-14IKBR Win10:6.0.1.8652, 330-15IKBR Win10:6.0.1.8652, 330-15IKBR (Brazil) Win10:6.0.1.8652, 330-15IKBR Touch Win10:6.0.1.8652, 330-17IKBR Win10:6.0.1.8652, YOGA 730-13IKB Win10:6.0.1.8644, YOGA 730-15IKB Win10:6.0.1.8644, ThinkPad L560 6.0.1.8644 and 6.0.1.8652, ThinkPad L570 6…

In Lenovo systems, SMM BIOS Write Protection is used to prevent writes to SPI Flash. While this provides sufficient protection, an additional layer of protection is provided by SPI Protected Range Registers (PRx). Lenovo was notified that after resuming from S3 sleep mode in various versions of BIOS for Lenovo systems, the PRx is not set. This does not impact the SMM BIOS Write Protection, which keeps systems protected.

A privilege escalation vulnerability was identified in Lenovo Active Protection System for ThinkPad systems versions earlier than 1.82.0.17. An attacker with local privileges could execute code with administrative privileges via an unquoted service path.

A vulnerability has been identified in a signed kernel driver for the BIOS of some ThinkPad systems that can allow an attacker with Windows administrator-level privileges to call System Management Mode (SMM) services. This could lead to a denial of service attack or allow certain BIOS variables or settings to be altered (such as boot sequence). The setting or changing of BIOS passwords is not affected by this vulnerability.