[Japanese]

JVNDB-2026-020742

Generic IO & Memory Access driver for TOSHIBA and Dynabook PCs exposes its IOCTL with insufficient access control

Overview

Generic IO & Memory Access driver is part of a utility to configure BIOS/Supervisor passwords from within Windows. This driver is installed on PCs provided by TOSHIBA CORPORATION and Dynabook Inc. between 2009 and 2016.
The driver contains the following vulnerability.
  • Exposed IOCTL with Insufficient Access Control (CWE-782) - CVE-2026-56129
    • The CVSS assessment above assumes that a user with no administrative privilege accesses physical memory.
Akshit Yadav (valium) reported this vulnerability to the developer. The developer reported the case to JPCERT/CC to notify users of the solution through JVN.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 5.5 (Medium) [Other]
  • Attack Vector: Local
  • Attack Complexity: Low
  • Privileges Required: Low
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality Impact: None
  • Integrity Impact: High
  • Availability Impact: None
Affected Products


TOSHIBA
  • Generic IO & Memory Access driver all versions

Dynabook Inc. provides the list of the PC models containing the affected driver.
Impact

A logged-in user with no administrative privilege may access physical memory.
Solution

[Stop using the products and Use alternative methods]
No update will be provided for this driver.
Delete the affected driver and use the BIOS setup function to configure BIOS/Supervisor passwords.
For more information, refer to the information provided by the developer.
Vendor Information

Dynabook Inc.
CWE (What is CWE?)

  1. Exposed IOCTL with Insufficient Access Control(CWE-782) [Other]
CVE (What is CVE?)

  1. CVE-2026-56129
References

  1. JVN : JVNVU#91051826
Revision History

  • [2026/06/26]
      Web page was published

Date Public2026/06/25
Date First Published2026/06/26
Date Last Updated2026/06/26