Bug 2486475 (CVE-2026-46284)

Summary:	CVE-2026-46284 kernel: mm/hugetlb: fix early boot crash on parameters without '=' separator
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 hugetlb memory management. A local user could exploit this by providing malformed kernel command-line parameters, such as `hugepages` or `hugepagesz`, without an '=' separator. This improper handling of input during early parameter parsing can lead to a system crash, resulting in a Denial of Service (DoS) during the boot process.	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 2026-06-08 17:04:00 UTC

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

mm/hugetlb: fix early boot crash on parameters without '=' separator

If hugepages, hugepagesz, or default_hugepagesz are specified on the
kernel command line without the '=' separator, early parameter parsing
passes NULL to hugetlb_add_param(), which dereferences it in strlen() and
can crash the system during early boot.

Reject NULL values in hugetlb_add_param() and return -EINVAL instead.

Comment 1 Keith Grant 2026-06-08 19:44:33 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026060842-CVE-2026-46284-229a@gregkh/T