Bug 2536148 (CVE-2026-90163)

Summary:	CVE-2026-90163 kernel: smb/server: call ksmbd_proc_cleanup() on module init failure
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
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:
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Doc Text:	A flaw was found in the Linux kernel's ksmbd (SMB server) component. When the ksmbd module fails to initialize, certain resources, such as the proc tree and per-CPU counters, are not properly deallocated. This resource leak can be exploited by a local user, potentially leading to a Denial of Service (DoS) condition due to resource exhaustion.	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 2026-09-17 16:40:52 UTC

In the Linux kernel, the following vulnerability has been resolved:

smb/server: call ksmbd_proc_cleanup() on module init failure

When a later initializer fails, the unwind chain releases resources
created after procfs and then jumps directly to class_unregister().
Returning an error from module_init() leaves the proc tree and its
per-CPU counters allocated.

Comment 1 Keith Grant 2026-09-23 18:54:30 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90163.mbox