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
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-07-09 11:01 UTC by OSIDB Bzimport
Modified: 2025-07-09 17:49 UTC (History)
0 users

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 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025070934-CVE-2025-38247-14ac@gregkh/T
Note You need to log in before you can comment on or make changes to this bug.