Bug 2393481 (CVE-2025-39697)

Summary:	CVE-2025-39697 kernel: NFS: Fix a race when updating an existing write
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:	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 use after free in the Linux kernel NFS functionality was found in the way connected user sends malicious data to the server. A remote user could use this flaw to crash the 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 2025-09-05 18:01:19 UTC

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

NFS: Fix a race when updating an existing write

After nfs_lock_and_join_requests() tests for whether the request is
still attached to the mapping, nothing prevents a call to
nfs_inode_remove_request() from succeeding until we actually lock the
page group.
The reason is that whoever called nfs_inode_remove_request() doesn't
necessarily have a lock on the page group head.

So in order to avoid races, let's take the page group lock earlier in
nfs_lock_and_join_requests(), and hold it across the removal of the
request in nfs_inode_remove_request().

Comment 1 Praise Ogwuche 2025-09-05 21:52:58 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025090548-CVE-2025-39697-5284@gregkh/T

Comment 3 errata-xmlrpc 2025-10-27 18:31:37 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2025:19106 https://access.redhat.com/errata/RHSA-2025:19106

Comment 6 errata-xmlrpc 2025-11-12 00:31:14 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2025:21051 https://access.redhat.com/errata/RHSA-2025:21051

Comment 7 errata-xmlrpc 2025-11-12 08:08:42 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2025:21091 https://access.redhat.com/errata/RHSA-2025:21091

Comment 8 errata-xmlrpc 2025-11-12 12:22:08 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2025:21118 https://access.redhat.com/errata/RHSA-2025:21118

Comment 9 errata-xmlrpc 2025-11-12 13:48:42 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2025:21128 https://access.redhat.com/errata/RHSA-2025:21128

Comment 10 errata-xmlrpc 2025-11-12 15:05:08 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2025:21136 https://access.redhat.com/errata/RHSA-2025:21136

Comment 11 errata-xmlrpc 2025-11-17 09:26:41 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:21469 https://access.redhat.com/errata/RHSA-2025:21469

Comment 12 errata-xmlrpc 2025-11-19 12:27:21 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2025:21760 https://access.redhat.com/errata/RHSA-2025:21760

Comment 13 errata-xmlrpc 2025-11-24 02:36:07 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2025:21917 https://access.redhat.com/errata/RHSA-2025:21917

Comment 14 errata-xmlrpc 2025-11-24 06:19:22 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2025:21920 https://access.redhat.com/errata/RHSA-2025:21920

Comment 15 errata-xmlrpc 2025-11-25 00:37:18 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2025:22006 https://access.redhat.com/errata/RHSA-2025:22006

Comment 16 errata-xmlrpc 2025-12-04 12:45:43 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2025:22752 https://access.redhat.com/errata/RHSA-2025:22752

Comment 17 errata-xmlrpc 2025-12-10 00:49:40 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2025:22998 https://access.redhat.com/errata/RHSA-2025:22998

Comment 19 errata-xmlrpc 2025-12-17 07:45:21 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2025:23445 https://access.redhat.com/errata/RHSA-2025:23445

Comment 22 errata-xmlrpc 2026-01-19 13:14:57 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:0804 https://access.redhat.com/errata/RHSA-2026:0804