CVE-2026-9266
HighCVSS 7.0Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
A Missing Required Cryptographic Step vulnerability has been identified in Moxa's embedded Linux firmware for industrial computers. This vulnerability represents an incomplete remediation of CVE-2026-0714, where TPM2 parameter encryption does not provide effective protection due to an omission.
Risk Assessment
An attacker with invasive physical access can 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, it requires invasive physical access.
Recommendation
It is recommended to restrict physical access to devices and monitor them to prevent unauthorized tampering. Additionally, consider updating the firmware to patch this vulnerability.
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Original NVD description (English source)
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.