CVE-2026-98147
Received Received - Intake

Linux Kernel printk kthread_run Failure Handling Issue

Publication date: 2026-09-25

Last updated on: 2026-09-25

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: printk: Don't WARN on kthread_run failure. Since __kthread_create_on_node() returns -EINTR upon SIGKILL, we should not use WARN_ON() in order to catch kthread_run() failure.

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Meta Information

Published
2026-09-25
Last Modified
2026-09-25
Generated
2026-09-25
AI Q&A
2026-09-25
EPSS Evaluated
N/A
NVD
CVE-2026-98147
EUVD
EUVD-2026-86978

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability involves the Linux kernel improperly handling kthread_run failures. The issue occurs because __kthread_create_on_node() returns -EINTR when interrupted by SIGKILL, but the code incorrectly uses WARN_ON() to catch kthread_run() failures, which can lead to unnecessary warnings.

Detection Guidance

This vulnerability is related to a Linux kernel issue where WARN_ON() is incorrectly used in kthread_run() failure handling. Detection requires checking kernel logs for WARN_ON messages related to kthread_run failures. Examine system logs with commands like 'dmesg | grep -i warn' or 'journalctl -k | grep -i warn' to identify such warnings.

Impact Analysis

This vulnerability may cause unnecessary kernel warnings when kthread_run fails due to SIGKILL signals. While not directly exploitable, it could clutter system logs and potentially obscure other important warnings.

Mitigation Strategies

Apply the latest Linux kernel update that resolves this issue. Monitor kernel logs for kthread_run-related WARN_ON messages after updating. If warnings persist, check for SIGKILL signals interrupting kernel threads or review custom kernel modules that may trigger this behavior.

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