CVE-2026-55728
Received Received - Intake

Stack-based Buffer Overflow in Loytec LINX Devices

Publication date: 2026-07-24

Last updated on: 2026-07-24

Assigner: Switzerland Government Common Vulnerability Program

Description
Stack-based Buffer Overflow (CWE-121) in `/usr/bin/ltsudo` `cmd_ipaddr_conflict` in Loytec LIP-ME201C, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.16 on LINX-A64 allows a `superadmin`-group attacker to trigger a SUID-root process abort or potentially elevate privileges via an overly long interface-name argument.

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Meta Information

Published
2026-07-24
Last Modified
2026-07-24
Generated
2026-07-24
AI Q&A
2026-07-24
EPSS Evaluated
N/A
NVD
CVE-2026-55728
EUVD
EUVD-2026-48593

Affected Vendors & Products

Showing 9 associated CPEs
Vendor Product Version / Range
loytec lip-me201c to 8.4.16 (inc)
loytec l-inx to 8.4.16 (inc)
loytec l-gate to 8.4.16 (inc)
loytec l-roc to 8.4.16 (inc)
loytec l-iob to 8.4.16 (inc)
loytec l-dali to 8.4.16 (inc)
loytec l-vis to 8.4.16 (inc)
loytec l-pad to 8.4.16 (inc)
loytec l-web to 8.4.16 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

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Executive Summary

This is a stack-based buffer overflow vulnerability in the ltsudo SUID-root binary's cmd_ipaddr_conflict function. It occurs when a user-supplied interface name is copied into a fixed 20-byte stack buffer without length validation using strcpy. This allows a superadmin-group attacker to potentially crash the process or elevate privileges.

Detection Guidance

Check for the presence of vulnerable LOYTEC devices by inspecting firmware versions. The affected systems include L-WEB, L-ROC, L-INX, L-IOB, and related hardware. Verify if the installed firmware is below version 8.4.18.

Impact Analysis

An attacker with superadmin access could trigger a SUID-root process abort, causing service disruption. In extreme cases, it may allow privilege escalation to root level. The impact is limited to local attacks since exploitation requires existing superadmin-group access.

Mitigation Strategies

Upgrade the firmware of all affected LOYTEC devices to version 8.4.18 or later. This addresses the stack-based buffer overflow in the ltsudo binary.

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