RT-Labs P-Net up to 1.0.2 pf_cpm_c_data_ind integer underflow

Summaryinfo

A vulnerability, which was classified as critical, has been found in RT-Labs P-Net up to 1.0.2. This issue affects the function pf_cpm_c_data_ind. The manipulation leads to integer underflow. This vulnerability is uniquely identified as CVE-2026-111735. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in RT-Labs P-Net up to 1.0.2. It has been rated as critical. This issue affects the function pf_cpm_c_data_ind. The manipulation with an unknown input leads to a integer underflow vulnerability. Using CWE to declare the problem leads to CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

P-Net before 1.0.3 contains an integer underflow in pf_cpm_c_data_ind(). When handling a received cyclic data frame while the consumer is in the FRUN or RUN state, the offset of the APDU status was computed as the frame length minus 4 using 16-bit arithmetic, without checking that the frame is long enough. A crafted short frame makes the offset wrap around, so the function reads outside the receive buffer. This can cause a crash (denial of service) or disclose memory content.

The advisory is shared at rt-labs.com. The identification of this vulnerability is CVE-2026-111735 since 10/16/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 1.0.3 eliminates this vulnerability.

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Productinfo

Vendor

• RT-Labs

Name

• P-Net

Version

• 1.0.0
• 1.0.1
• 1.0.2

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CPE 2.2info

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