Vulnerability in Linux

CVE-2025-38247

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.001 (1.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 1.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-38247: held from 0.001 to 0.001.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

  • Linux — versions c4a16820d90199409c9bf01c4f794e1e9e8d8fd8, 6.15, 0
  • Linux Kernel — versions 6.16

References

Frequently asked questions

What is CVE-2025-38247?
CVE-2025-38247 is a medium-severity vulnerability in Linux. CVSS score: 5.5/10. Published 2025-07-09.
How severe is CVE-2025-38247?
Medium severity. CVSS v3 base score is 5.5 out of 10.