Bug 2457825 (CVE-2026-31416)

Summary:	CVE-2026-31416 kernel: Linux kernel: Netfilter Denial of Service due to netlink header size miscalculation
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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Doc Text:	A flaw was found in the Linux kernel's netfilter subsystem, specifically within `nfnetlink_log`. A local user could exploit this vulnerability by sending a crafted netlink message that causes an incorrect accounting of the netlink header size. This miscalculation can lead to a Denial of Service (DoS), resulting in a warning message and the dropping of the netlink message.	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 2026-04-13 14:01:33 UTC

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

netfilter: nfnetlink_log: account for netlink header size

This is a followup to an old bug fix: NLMSG_DONE needs to account
for the netlink header size, not just the attribute size.

This can result in a WARN splat + drop of the netlink message,
but other than this there are no ill effects.

Comment 1 Alexander B 2026-04-14 10:36:01 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026041310-CVE-2026-31416-9c4a@gregkh/T