Bug 2541358 (CVE-2026-98147)

Summary:	CVE-2026-98147 kernel: printk: Don't WARN on kthread_run failure
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel printk subsystem. A local user could trigger a Denial of Service (DoS) by causing an unexpected system crash if the kernel is configured to panic on warnings. This issue occurs because the kernel inappropriately triggers a warning check when background print thread creation fails due to an interruption signal. By terminating the thread creation process, an attacker can provoke this warning condition and disrupt system availability.	Story Points:	---
Clone Of:		Environment:
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-09-25 11:33:32 UTC

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.

Comment 1 Keith Grant 2026-09-28 16:04:40 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98147.mbox