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clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns What we want is to verify there is that clone won't expose something hidden by a mount we wouldn't be able to undo. "Wouldn't be able to undo" may be a result of MNT_LOCKED on a child, but it may also come from lacking admin rights in the userns of the namespace mount belongs to. clone_private_mnt() checks the former, but not the latter. There's a number of rather confusing CAP_SYS_ADMIN checks in various userns during the mount, especially with the new mount API; they serve different purposes and in case of clone_private_mnt() they usually, but not always end up covering the missing check mentioned above.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.15.190, 6.1.147, 6.12.40, 6.15.3, 6.6.100
CVEs
CVE-2025-38499
Confirmed fixed CVEs
Not specified
Updated in this feed
5 Nov 2026, 03:15 UTC · Revision 1

Source evidence

clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns

core-osv · Original source

Published 11 Aug 2025, 16:01 UTC

In the Linux kernel, the following vulnerability has been resolved: clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns What we want is to verify there is that clone won't expose something hidden by a mount we wouldn't be able to undo. "Wouldn't be able to undo" may be a result of MNT_LOCKED on a child, but it may also come from lacking admin rights in the userns of the namespace mount belongs to. clone_private_mnt() checks the former, but not the latter. There's a number of rather confusing CAP_SYS_ADMIN checks in various userns during the mount, especially with the new mount API; they serve different purposes and in case of clone_private_mnt() they usually, but not always end up covering the missing check mentioned above.

osv:CVE-2025-38499

Kernel

Fixed versions: 5.15.190, 6.1.147, 6.6.100, 6.12.40, 6.15.3

Complete source record
{
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  "url": "https://osv.dev/vulnerability/CVE-2025-38499",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns What we want is to verify there is that clone won't expose something hidden by a mount we wouldn't be able to undo. \"Wouldn't be able to undo\" may be a result of MNT_LOCKED on a child, but it may also come from lacking admin rights in the userns of the namespace mount belongs to. clone_private_mnt() checks the former, but not the latter. There's a number of rather confusing CAP_SYS_ADMIN checks in various userns during the mount, especially with the new mount API; they serve different purposes and in case of clone_private_mnt() they usually, but not always end up covering the missing check mentioned above.",
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      "modified": "2026-10-28T02:30:42.174962600Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-082556.html",
        "https://git.kernel.org/stable/c/36fecd740de2d542d2091d65d36554ee2bcf9c65",
        "https://git.kernel.org/stable/c/38628ae06e2a37770cd794802a3f1310cf9846e3",
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        "https://git.kernel.org/stable/c/d717325b5ecf2a40daca85c61923e17f32306179",
        "https://git.kernel.org/stable/c/dc6a664089f10eab0fb36b6e4f705022210191d2",
        "https://git.kernel.org/stable/c/e77078e52fbf018ab986efb3c79065ab35025607",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38499.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38499",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
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        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38499.json"
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        "evidence": "/id"
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    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 509758,
  "published_at": "2025-08-11T16:01:08.257+00:00"
}