CVE-2026-55728

SUID-root process abort via unchecked stack copy

Published Jul 24, 2026 · Updated Jul 24, 2026

Stack-based buffer overflow in LOYTEC LINX firmware 8.4.16 and earlier allows local users in the superadmin group to abort ltsudo. The cmd_ipaddr_conflict subcommand copies a user-supplied interface name with strcpy into a fixed 20-byte stack buffer without checking its length. Only superadmin-group access on LINX-A64 reaches the flaw; LOYTEC confirms log flooding from aborts, while the CVE record identifies privilege escalation as a possible outcome.

CVSS severityUnavailable
Unscored
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in LOYTEC LINX firmware 8.4.16 and earlier allows local users in the superadmin group to abort ltsudo. The cmd_ipaddr_conflict subcommand copies a user-supplied interface name with strcpy into a fixed 20-byte stack buffer without checking its length. Only superadmin-group access on LINX-A64 reaches the flaw; LOYTEC confirms log flooding from aborts, while the CVE record identifies privilege escalation as a possible outcome.

The record

CVE
CVE-2026-55728
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
LOYTEC
Product
L-GATE
Classifications
CWE-121, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=8.4.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

LOYTEC · L-GATEversion=0 <=8.4.16
LOYTEC · L-IOBversion=0 <=8.4.16
LOYTEC · L-ROCversion=0 <=8.4.16
LOYTEC · L-INXversion=0 <=8.4.16
LOYTEC · LIP-ME20xCversion=0 <=8.4.16
LOYTEC · L-VISversion=0 <=8.4.16
LOYTEC · L-DALIversion=0 <=8.4.16
LOYTEC · L-PADversion=0 <=8.4.16

Published CVSS scores

3.8Switzerland Government Common Vulnerability ProgramCVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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