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01 Record

CVE-2026-4018

TOCTOU race condition in the QNX Neutrino kernel impacts versions of the QNX Software Development Platform and QNX OS for Safety

MediumPUBLISHEDCNA: blackberry
CNA base score6.4 CVSS v3.xCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

02 Description

TOCTOU race condition in the QNX Neutrino kernel impacts versions of the QNX Software Development Platform and QNX OS for Safety

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.10% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 1.0% of scored records. A rank, not a probability.
NVD base score
6.4 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD analysis status
Deferred. NVD last modified this record on 2026-07-15.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-07-14 17:34Z3 MO AGO
Last updated
2026-07-15 14:01Z3 MO AGO
Reserved
2026-03-11
Assigning CNA
blackberry
Record state
PUBLISHED
Severity
Medium (CVSS 6.4)
CNA CVSS vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Weaknesses
  • CWE-367Time-of-check Time-of-use (TOCTOU) Race ConditionBase
Data version
5.2
Document digest
56c2e5989df8ea05e4dc4b55b63391387e2d17e3c58d4ea52c2aebddb0b61b00

05 Affected products

VendorProductVersionsPlatforms
BlackBerry LtdQNX Software Development Platform7.1, cpe:2.3:a:blackberry:qnx_software_development_platform:7.1:*:*:*:*:*:*:*, 7.0, cpe:2.3:a:blackberry:qnx_software_development_platform:7.0:*:*:*:*:*:*:*—
BlackBerry LtdQNX OS for Safety2.2.8 and earlier, cpe:2.3:o:blackberry:qnx_os_for_safety:2.2:8:*:*:*:*:*:*, 2.1.5 and earlier, cpe:2.3:o:blackberry:qnx_os_for_safety:2.1:5:*:*:*:*:*:*, 2.0.3 and earlier, cpe:2.3:o:blackberry:qnx_os_for_safety:2.0:3:*:*:*:*:*:*—
BlackBerry Ltd.QNX OS for Medical2.0.2 and earlier, cpe:2.3:o:blackberry:qnx_os_for_medical:2.0:2:*:*:*:*:*:*—

06 References