Bug 2481951 (CVE-2026-45917)

Summary:	CVE-2026-45917 kernel: ipvs: do not keep dest_dst if dev is going down
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:	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 IP Virtual Server (IPVS) component. A race condition exists between the network device notifier and the destination cache when a device is shutting down. This can lead to a leaked device reference, potentially causing system instability or a denial of service (DoS) due to resource exhaustion.	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 2026-05-27 15:03:57 UTC

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

ipvs: do not keep dest_dst if dev is going down

There is race between the netdev notifier ip_vs_dst_event()
and the code that caches dst with dev that is going down.
As the FIB can be notified for the closed device after our
handler finishes, it is possible valid route to be returned
and cached resuling in a leaked dev reference until the dest
is not removed.

To prevent new dest_dst to be attached to dest just after the
handler dropped the old one, add a netif_running() check
to make sure the notifier handler is not currently running
for device that is closing.

Comment 1 Keith Grant 2026-05-28 01:30:34 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052723-CVE-2026-45917-7597@gregkh/T