CVE-2026-56129

Arbitrary physical-memory access via insufficient IOCTL access control

Published Jun 25, 2026 · Updated Jun 25, 2026

Exposed IOCTL access in all versions of the Dynabook and Toshiba Generic IO & Memory Access Driver allows local users to access physical memory. QIOMEM.SYS accepts driver-control requests without restricting the interface to privileged callers. A logged-in non-administrator must execute a local program, after which arbitrary physical-memory access enables unauthorized operations and modification of system behavior or data.

CVSS severity6.8
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Exposed IOCTL access in all versions of the Dynabook and Toshiba Generic IO & Memory Access Driver allows local users to access physical memory. QIOMEM.SYS accepts driver-control requests without restricting the interface to privileged callers. A logged-in non-administrator must execute a local program, after which arbitrary physical-memory access enables unauthorized operations and modification of system behavior or data.

The record

CVE
CVE-2026-56129
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
Dynabook Inc.
Product
Generic IO & Memory Access Driver
Classifications
CWE-782, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=all versions

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Dynabook Inc. · Generic IO & Memory Access Driverversion=all versions
Toshiba Corporation · Generic IO & Memory Access Driverversion=all versions

Published CVSS scores

6.8JPCERT/CCCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
5.5JPCERT/CCCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-782Exposed IOCTL with Insufficient Access Control
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo