dbcve.org
Stack-based Buffer OverflowWeakness · CWE-121

CVE-2026-4017

HIGH · 7.4 CVSS v3.1 Published 2026-07-14
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
79/100
Remediation priority · High
No privileges Zero-click 5 weeks old

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Buffer Overflow in the entry handler of the TraceEvent() system call could allow an attacker with local access to cause information disclosure, data tampering or a crash of the QNX Neutrino kernel.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

A buffer overflow exists in the entry handler of the TraceEvent() system call in QNX Neutrino RTOS. An attacker with local access can exploit this to achieve information disclosure, data tampering, or cause a kernel crash.

MitigationApply vendor-provided patches for QNX Neutrino; restrict local access to trusted personnel and verify system call handling.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify QNX Neutrino RTOS installation
    Run 'uname -a' or check system information to confirm the OS is QNX Neutrino. Look for 'QNX' or 'Neutrino' in the output
    Affected if The system is running QNX Neutrino RTOS
  2. Determine QNX Neutrino version
    Execute 'uname -v' or 'version' command to obtain the exact version number. Compare this against the affected version ranges for CVE-2026-4017
    Affected if The installed version falls within the vulnerable version ranges (if known) or is unpatched
  3. Verify TraceEvent system call presence
    Check if the TraceEvent() system call is available on the system. This may involve examining system call tables or attempting to invoke the syscall through debugging or tracing tools
    Affected if The TraceEvent system call exists and is accessible to local users
  4. Assess local access controls
    Review local user accounts and shell access permissions using commands like 'who', 'id', or examining user/group configurations
    Affected if Untrusted local users can access the system and potentially invoke the vulnerable TraceEvent system call

System is affected if running QNX Neutrino RTOS with the TraceEvent system call accessible to untrusted local users in a version that has not been patched for CVE-2026-4017

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply vendor-provided patches for QNX Neutrino; restrict local access to trusted personnel and verify system call handling.

Have this fixed Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing5.0 h
  • Review / QA3.0 h
17.0 hours of engineering $2,970
Get help mitigating

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,752.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2026-4017 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-4017 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data