Bug 2532302 (CVE-2026-89680)

Summary:	CVE-2026-89680 kernel: nfsd: fix nfsd_file leak on inter-server COPY setup failure
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
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:
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Doc Text:	A flaw was found in the Linux kernel's nfsd component. This vulnerability occurs when an inter-server COPY operation fails during its setup phase, leading to improper resource cleanup. Consequently, each failed operation results in a memory leak, consuming system resources. A remote attacker could repeatedly trigger these failures, potentially leading to resource exhaustion and a Denial of Service (DoS) on the affected system.	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 2026-09-11 22:14:11 UTC

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

nfsd: fix nfsd_file leak on inter-server COPY setup failure

When nfsd4_setup_inter_ssc() fails, nfsd4_copy() returns
nfserr_offload_denied directly, bypassing the out: label where
release_copy_files() would drop the nf_dst reference taken by
nfs4_preprocess_stateid_op(). Each failed inter-server COPY
leaks one nfsd_file, pinning file/inode/dentry/vfsmount.

Fix by setting status and jumping to out: instead of returning
directly.

Comment 1 Mauro Matteo Cascella 2026-09-21 09:19:48 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89680.mbox