Bug 2492430 (CVE-2026-52970)

Summary:	CVE-2026-52970 kernel: netfilter: nft_ct: fix missing expect put in obj eval
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
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Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the `netfilter: nft_ct` component of the Linux kernel. The `nft_ct_expect_obj_eval()` function allocates an expectation but fails to release its local reference. This oversight leads to a resource leak, which could potentially allow a local attacker to cause a denial of service by exhausting system resources.	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 2026-06-24 18:11:39 UTC

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

netfilter: nft_ct: fix missing expect put in obj eval

nft_ct_expect_obj_eval() allocates an expectation and may call
nf_ct_expect_related(), but never drops its local reference.

Add nf_ct_expect_put(exp) before return to balance allocation.

Comment 1 Mauro Matteo Cascella 2026-06-26 11:31:53 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062439-CVE-2026-52970-8bc3@gregkh/T