2378985 – (CVE-2025-38247) CVE-2025-38247 kernel: userns and mnt_idmap leak in open_tree_attr(2)

Bug 2378985 (CVE-2025-38247) - CVE-2025-38247 kernel: userns and mnt_idmap leak in open_tree_attr(2)

Summary: CVE-2025-38247 kernel: userns and mnt_idmap leak in open_tree_attr(2)

Keywords:
Status:	NEW
Alias:	CVE-2025-38247
Product:	Security Response
Classification:	Other
Component:	vulnerability
Sub Component:
Version:	unspecified
Hardware:	All
OS:	Linux
Priority:	medium
Severity:	medium
Target Milestone:	---
Assignee:	Product Security DevOps Team
QA Contact:
Docs Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+	depends on / blocked

Reported:	2025-07-09 11:01 UTC by OSIDB Bzimport
Modified:	2026-06-29 18:27 UTC (History)
CC List:	2 users (show)
Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments	(Terms of Use)

Description OSIDB Bzimport 2025-07-09 11:01:50 UTC

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

userns and mnt_idmap leak in open_tree_attr(2)

Once want_mount_setattr() has returned a positive, it does require
finish_mount_kattr() to release ->mnt_userns.  Failing do_mount_setattr()
does not change that.

As the result, we can end up leaking userns and possibly mnt_idmap as
well.

Comment 1 Jon Moroney 2025-07-09 17:48:33 UTC Comment hidden (spam)

This comment was flagged as spam, view the edit history to see the original text if required.

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