Bug 2482051 (CVE-2026-45901)

Summary:	CVE-2026-45901 kernel: netfilter: nf_tables: revert commit_mutex usage in reset path
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 netfilter nf_tables component. This vulnerability allows a local attacker to cause a denial of service (DoS) by triggering a circular lock dependency. This occurs when nft reset, ipset list, and iptables-nft with a '-m set' rule are executed concurrently, leading to a system hang.	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 15:08:54 UTC

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

netfilter: nf_tables: revert commit_mutex usage in reset path

It causes circular lock dependency between commit_mutex, nfnl_subsys_ipset
and nlk_cb_mutex when nft reset, ipset list, and iptables-nft with '-m set'
rule run at the same time.

Previous patches made it safe to run individual reset handlers concurrently
so commit_mutex is no longer required to prevent this.

Comment 1 Keith Grant 2026-05-28 02:19:54 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052720-CVE-2026-45901-b818@gregkh/T