CVE-2025-38247

userns and mnt_idmap leak in open_tree_attr(2)

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.

N/A

CVSS

Severity:

EPSS 0.02%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/142db4e76110dd80239f4e79810f85ea1735ad60
https://git.kernel.org/stable/c/0748e553df0225754c316a92af3a77fdc057b358

Frequently Asked Questions

What is the severity of CVE-2025-38247?: CVE-2025-38247 has not yet been assigned a CVSS score.
How to fix CVE-2025-38247?: To fix CVE-2025-38247, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-38247 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-38247 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-38247?: CVE-2025-38247 affects Linux Linux, Linux Linux.

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