Bug 2468260 (CVE-2026-43440)

Summary:	CVE-2026-43440 kernel: net/mana: Null service_wq on setup error to prevent double destroy
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	rhel-process-autobot, 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's `net/mana` network driver. An error in the `mana_gd_setup()` function's cleanup process could result in a use-after-free vulnerability. This occurs because the `service_wq` workqueue pointer is not correctly nulled after destruction during setup errors, which could allow an attacker to potentially cause a system crash (denial of service) or execute arbitrary code.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
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Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-05-08 15:07:32 UTC

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

net/mana: Null service_wq on setup error to prevent double destroy

In mana_gd_setup() error path, set gc->service_wq to NULL after
destroy_workqueue() to match the cleanup in mana_gd_cleanup().
This prevents a use-after-free if the workqueue pointer is checked
after a failed setup.

Comment 1 Keith Grant 2026-05-09 00:07:36 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050854-CVE-2026-43440-e11e@gregkh/T