CVE-2026-68174

Local system crash via dynamic-event union confusion

Published Aug 10, 2026 · Updated Aug 10, 2026

Type confusion in Linux kernel tracing 6.14 and later allows local users to crash the system through dynamic-event module filtering. The __ftrace_set_clr_event_nolock() and update_event_fields() paths read a dynamic trace_event_call union's refcnt as call->module without checking TRACE_EVENT_FL_DYNAMIC, then dereference the integer as a module pointer. A dynamic event must have a nonzero reference count, and module-specific filtering or field updates must reach the affected path; the invalid-pointer dereference causes a kernel Oops and service interruption.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in Linux kernel tracing 6.14 and later allows local users to crash the system through dynamic-event module filtering. The __ftrace_set_clr_event_nolock() and update_event_fields() paths read a dynamic trace_event_call union's refcnt as call->module without checking TRACE_EVENT_FL_DYNAMIC, then dereference the integer as a module pointer. A dynamic event must have a nonzero reference count, and module-specific filtering or field updates must reach the affected path; the invalid-pointer dereference causes a kernel Oops and service interruption.

The record

CVE
CVE-2026-68174
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-843, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=4c86bc531e60900053384867c082675bba82c29f <43a23dfe0024afd3d2b0232e987d0292919a9b24
  2. Affected versionversion=4c86bc531e60900053384867c082675bba82c29f <b4eb07bde606c2096b24252be589e735eff6d413
  3. Affected versionversion=4c86bc531e60900053384867c082675bba82c29f <b6a4575f22925da7e6aa00171e9fc0e5029c0bc9
  4. Affected versionversion=6.14

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4c86bc531e60900053384867c082675bba82c29f <43a23dfe0024afd3d2b0232e987d0292919a9b24; version=4c86bc531e60900053384867c082675bba82c29f <b4eb07bde606c2096b24252be589e735eff6d413; version=4c86bc531e60900053384867c082675bba82c29f <b6a4575f22925da7e6aa00171e9fc0e5029c0bc9; version=6.14

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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