Kernel disclosure, tampering, and crash via TraceEvent race
Published Jul 14, 2026 · Updated Jul 14, 2026
TOCTOU race in the QNX Neutrino kernel in affected BlackBerry QNX products allows local users to read or write data or crash the kernel. Specific TraceEvent() trace commands check a resource and later use it without ensuring that its state remains unchanged, creating a race between those operations. Exploitation requires local access, the PROCMGR_AID_TRACE ability, and winning the race; consequences are limited to information disclosure, data tampering, or a kernel crash.
Summary
What happened
TOCTOU race in the QNX Neutrino kernel in affected BlackBerry QNX products allows local users to read or write data or crash the kernel. Specific TraceEvent() trace commands check a resource and later use it without ensuring that its state remains unchanged, creating a race between those operations. Exploitation requires local access, the PROCMGR_AID_TRACE ability, and winning the race; consequences are limited to information disclosure, data tampering, or a kernel crash.
The record
- CVE
- CVE-2026-4018
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- BlackBerry
- Product
- QNX Software Development Platform
- Classifications
- CWE-367, CAPEC-29, T1499
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jul 14, 2026CVE publishedPublication date reported by the CVE source.
- Jul 14, 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.
- Affected versionversion=7.0
- Affected versionversion=7.1
- Affected versionversion=cpe:2.3:a:blackberry:qnx_software_development_platform:7.0:*:*:*:*:*:*:*
- Affected versionversion=cpe:2.3:a:blackberry:qnx_software_development_platform:7.1:*:*:*:*:*:*:*
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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