{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38499",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38499"
  ],
  "published": "2025-08-11T16:01:47Z",
  "summary": "clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nclone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns\n\nWhat we want is to verify there is that clone won't expose something\nhidden by a mount we wouldn't be able to undo.  \"Wouldn't be able to undo\"\nmay be a result of MNT_LOCKED on a child, but it may also come from\nlacking admin rights in the userns of the namespace mount belongs to.\n\nclone_private_mnt() checks the former, but not the latter.\n\nThere's a number of rather confusing CAP_SYS_ADMIN checks in various\nuserns during the mount, especially with the new mount API; they serve\ndifferent purposes and in case of clone_private_mnt() they usually,\nbut not always end up covering the missing check mentioned above.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38499"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/36fecd740de2d542d2091d65d36554ee2bcf9c65"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d717325b5ecf2a40daca85c61923e17f32306179"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dc6a664089f10eab0fb36b6e4f705022210191d2"
    },
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      "url": "https://git.kernel.org/stable/c/e77078e52fbf018ab986efb3c79065ab35025607"
    },
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      "url": "https://git.kernel.org/stable/c/38628ae06e2a37770cd794802a3f1310cf9846e3"
    },
    {
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      "url": "https://git.kernel.org/stable/c/c28f922c9dcee0e4876a2c095939d77fe7e15116"
    }
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  "database_specific": {
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    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable code is reached only through local filesystem syscalls (fsopen/fsconfig/fsmount or mount(2)) issued by a process on the machine. There is no remote or adjacent-network exposure of clone_private_mount().\nAC:L - The attacker deterministically controls every step \u2014 creating the user namespace, opening the fs_context, passing the fd, and issuing FSCONFIG_CMD_CREATE from the confined mount namespace \u2014 with no race, no memory-layout dependency, and no reliance on any condition outside their control.\nPR:L - An ordinary unprivileged local user suffices: unshare(CLONE_NEWUSER|CLONE_NEWNS) yields CAP_SYS_ADMIN in a child userns for the fsopen(), and setns() back into that userns as its owner lets the same uid drive fsconfig() from the restricted mount namespace where it holds no privileges at all.\nUI:N - The entire sequence is performed by the attacker's own processes; no victim action, mount operation, or file access by another user is required.\nS:U - The bypassed mount visibility and the exposed files are all managed by the same kernel security authority; no VM, hypervisor, or IOMMU boundary is crossed.\nC:H - The private clone omits all child mounts, so entire directory trees deliberately concealed by mask/over-mounts the attacker cannot unmount (container masked paths, systemd InaccessiblePaths=/ProtectHome=, sandbox hiding mounts) become readable through the overlay lower layer.\nI:H - Using the same primitive for upperdir on a read-write parent mount discards read-only child bind mounts, giving direct write, create, and delete access to trees that mount-based hardening (ReadOnlyPaths=, ProtectSystem=strict, container ro binds) was enforcing as immutable.\nA:H - That regained write access covers the exact paths the confinement was protecting, so an attacker can overwrite or delete critical configuration and system files inside a hardened service or container and render it \u2014 or the host \u2014 inoperable."
    }
  }
}