PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-55728 Loytec CVE debrief

CVE-2026-55728 is a Stack-based Buffer Overflow vulnerability 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. This vulnerability allows a `superadmin`-group attacker to trigger a SUID-root process abort or potentially elevate privileges via an overly long interface-name argument. The vulnerability has a CVSS score of 3.8 and a severity of LOW.

Vendor
Loytec
Product
LIP-ME20xC
CVSS
LOW 3.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-24
Original CVE updated
2026-07-27
Advisory published
2026-07-24
Advisory updated
2026-07-27

Who should care

Administrators and users of 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 should be aware of this vulnerability and take necessary actions to mitigate it. Operators, platform administrators, and security teams need to review and act on this vulnerability.

Technical summary

The vulnerability is a Stack-based Buffer Overflow (CWE-121) in `/usr/bin/ltsudo` `cmd_ipaddr_conflict`. It allows a `superadmin`-group attacker to trigger a SUID-root process abort or potentially elevate privileges via an overly long interface-name argument. The vulnerability has a CVSS score of 3.8 and a severity of LOW. Affected products include 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.

Defensive priority

Low

Recommended defensive actions

  • Apply the vendor's patch or update to version 8.4.17 or later
  • Restrict access to the `/usr/bin/ltsudo` command to only necessary users
  • Monitor system logs for suspicious activity
  • Implement additional security controls to prevent exploitation
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-07-24T15:18:30.950Z and last modified on 2026-07-27T20:32:11.620Z. The NVD entry is currently Deferred. Evidence is limited to CVE and NVD information. Defenders should verify affected product deployments and review official advisories.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-55728 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-55728

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-55728 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-55728

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://www.loytec.com/support/product-security/advisories/8523-dibt-cve-20260526-0005-stack-buffer-overflow-in-cmd_ipaddr_conflict-low

    [email protected]

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.