Bug 2536453 (CVE-2026-90283)

Summary:	CVE-2026-90283 kernel: hugetlbfs: release subpool on fill_super failure
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:	akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, 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 hugetlbfs (huge page file system) component. When mounting hugetlbfs with specific size options, an error during root directory entry creation could lead to a subpool of huge pages not being properly released. This resource leak could allow a local attacker to exhaust system memory, leading to a denial of service (DoS).	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 2026-09-17 17:58:28 UTC

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

hugetlbfs: release subpool on fill_super failure

hugetlbfs_fill_super() allocates a hugepage subpool when size or min_size
mount options are specified.  hugepage_new_subpool() may also reserve huge
pages for min_size.

If root dentry creation fails after the subpool is created, the failure
path frees the subpool with kfree().  This bypasses hugepage_put_subpool()
and can leave min_size reservations charged.

Use hugepage_put_subpool() on the failure path, matching the normal
put_super path.

Comment 1 gkamathe 2026-09-22 17:19:26 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90283.mbox