# CVE-2026-40275: QNX Neutrino heap-based buffer overflow in DCMD_PROC_EVENT handler

Source: https://junglewise.ai/threats/cve-2026-40275-heap-based-buffer-overflow-in-the-dcmd-proc-event-handler-of-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-40275 · Severity: high · CVSS 8.4 · Published 2026-11-10

The QNX Neutrino kernel's process event handler contains a heap-based buffer overflow vulnerability that could be exploited by a local attacker. An attacker could use this flaw to crash the kernel, leak sensitive information from memory, or modify kernel data, resulting in system unavailability or potential privilege escalation.

Vendors: [QNX](https://junglewise.ai/threats/vendors/qnx).

## Quick answers

**Is CVE-2026-40275 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-40275 being exploited in the wild.

**How severe is CVE-2026-40275?** High severity, with a CVSS score of 8.4, published 10 November 2026.

**Which products and versions are affected?** QNX Neutrino.

**Is there a fix for CVE-2026-40275?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-40275 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-40275?** Check whether you run QNX Neutrino. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap-based buffer overflow exists in the DCMD_PROC_EVENT handler of the procnto kernel component. The vulnerability requires local access to trigger; an attacker can send a specially crafted request to overflow the heap and corrupt memory. This could lead to information disclosure, data tampering, kernel crash, or potential code execution depending on heap state and exploitation technique.

## Affected products

- QNX Neutrino

## Timeline

- 2026-11-10: disclosed

## References

- [https://support.blackberry.com/pkb/s/article/141342](https://support.blackberry.com/pkb/s/article/141342)

## Related threats

- [QNX Neutrino invalid pointer reference in TimerSettime](https://junglewise.ai/threats/cve-2026-40274-invalid-pointer-reference-in-the-timersettime-system-call-could)