CVE-2025-38247
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-07-09

Last updated on: 2025-11-19

Assigner: kernel.org

Description
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.
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Meta Information
Published
2025-07-09
Last Modified
2025-11-19
Generated
2026-05-07
AI Q&A
2025-07-09
EPSS Evaluated
2026-05-05
NVD
CVE-2025-38247
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
Helpful Resources
Exploitability
CWE
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CWE ID Description
CWE-NVD-CWE-noinfo
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AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability in the Linux kernel involves a leak of user namespace (userns) and possibly mount ID map (mnt_idmap) in the function open_tree_attr(2). Specifically, after the function want_mount_setattr() returns positively, the function finish_mount_kattr() is required to release the mnt_userns. However, if do_mount_setattr() fails, this release does not happen, leading to a leak of userns and potentially mnt_idmap.


How can this vulnerability impact me? :

The vulnerability can lead to leaking of user namespace and mount ID map information within the Linux kernel. This could potentially expose sensitive kernel-level information or lead to resource leaks, which might affect system stability or security depending on the context in which the kernel is used.


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