CVE-2025-38247 (GCVE-0-2025-38247)

Vulnerability from cvelistv5 – Published: 2025-07-09 10:42 – Updated: 2026-05-11 21:24
VLAI
Title
userns and mnt_idmap leak in open_tree_attr(2)
Summary
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c4a16820d90199409c9bf01c4f794e1e9e8d8fd8 , < 142db4e76110dd80239f4e79810f85ea1735ad60 (git)
Affected: c4a16820d90199409c9bf01c4f794e1e9e8d8fd8 , < 0748e553df0225754c316a92af3a77fdc057b358 (git)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.15.5 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
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      "current_release_date": "2026-06-30T00:59:30+00:00",
      "cve": "CVE-2025-38247",
      "id": "CVE-2025-38247",
      "initial_release_date": "2025-07-09T00:00:00+00:00",
      "product_status:known_affected": "14",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: userns and mnt_idmap leak in open_tree_attr(2)",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38247.json",
      "version": "3"
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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