Bug 2466803 (CVE-2026-43060)

Summary:	CVE-2026-43060 kernel: netfilter: nft_ct: drop pending enqueued packets on removal
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:	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 netfilter (nft_ct) component. When the nft_ct module is removed, packets still enqueued in the nfqueue might retain outdated references to connection tracking (conntrack) zone templates or timeout policies. This can lead to stale references, potentially causing system instability or a denial of service (DoS) if the referenced objects are no longer available.	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 2026-05-05 17:03:28 UTC

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

netfilter: nft_ct: drop pending enqueued packets on removal

Packets sitting in nfqueue might hold a reference to:

- templates that specify the conntrack zone, because a percpu area is
  used and module removal is possible.
- conntrack timeout policies and helper, where object removal leave
  a stale reference.

Since these objects can just go away, drop enqueued packets to avoid
stale reference to them.

If there is a need for finer grain removal, this logic can be revisited
to make selective packet drop upon dependencies.

Comment 1 Alexander B 2026-05-06 09:23:26 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050537-CVE-2026-43060-f42f@gregkh/T