Bug 2516632 (CVE-2026-72109)

Summary: CVE-2026-72109 kernel: net: sparx5: unregister blocking notifier on init failure
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: 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 `sparx5` network driver. An improper cleanup during initialization failure can leave a `switchdev` blocking notifier registered. This issue could lead to resource exhaustion or system instability, potentially resulting in a Denial of Service (DoS) condition.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-08-15 06:22:58 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: sparx5: unregister blocking notifier on init failure

sparx5_register_notifier_blocks() registers the switchdev blocking
notifier before allocating the ordered workqueue. If the workqueue
allocation fails, the error path unregisters the switchdev and netdevice
notifiers, but leaves the blocking notifier registered.

Add a separate error label for the workqueue allocation failure path and
unregister the switchdev blocking notifier there.
Comment 1 Keith Grant 2026-08-17 22:11:27 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081526-CVE-2026-72109-2112@gregkh/T