CVE-2026-9266

Missing Cryptographic Step Enables Physical Capture of Disk Encryption Key

Published Jun 12, 2026 CVSS 4.0 · 7 High EPSS < 1% KEV · Not listed
Description
A Missing Required Cryptographic Step vulnerability has been identified in Moxa's embedded Linux firmware for industrial computers and controllers. This vulnerability represents an incomplete remediation of CVE-2026-0714. The firmware introduced TPM2 parameter encryption as a countermeasure against CVE-2026-0714. However, an omission in the authorization session configuration causes the parameter encryption to provide no effective protection. An attacker with invasive physical access to the device can still capture TPM communications on the SPI bus and derive the LUKS disk encryption key in plaintext. While successful exploitation results in full compromise of the encrypted disk volume, the attack requires invasive physical access, including opening the device and attaching external equipment to the SPI bus. Remote exploitation is not possible, and the attack does not affect any downstream systems.

Remediation

Vendor Solution

Please refer to Moxa's security advisory.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Missing Cryptographic Step Enables Physical Capture of Disk Encryption Key
Type Values Removed Values Added
Description A Missing Required Cryptographic Step vulnerability has been identified in Moxa's embedded Linux firmware for industrial computers and controllers. This vulnerability represents an incomplete remediation of CVE-2026-0714. The firmware introduced TPM2 parameter encryption as a countermeasure against CVE-2026-0714. However, an omission in the authorization session configuration causes the parameter encryption to provide no effective protection. An attacker with invasive physical access to the device can still capture TPM communications on the SPI bus and derive the LUKS disk encryption key in plaintext. While successful exploitation results in full compromise of the encrypted disk volume, the attack requires invasive physical access, including opening the device and attaching external equipment to the SPI bus. Remote exploitation is not possible, and the attack does not affect any downstream systems.
First Time appeared Moxa
Moxa uc-1200a Series
Weaknesses CWE-325
CPEs cpe:2.3:a:moxa:uc-1200a_series:*:*:os_image_mil3_secure_version_:*:*:*:*:*
Vendors & Products Moxa
Moxa uc-1200a Series
References
Metrics cvssV4_0

{'score': 7, 'vector': 'CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Moxa
Published
Updated
Jun 12, 2026, 1:29 PM
Reserved
May 22, 2026, 2:41 AM
Status
Awaiting Analysis
Published
Jun 12, 2026, 11:16 AM
Modified
Oct 26, 2026, 11:10 AM