ghsa-5rcm-hxrf-mw27
Vulnerability from github
Published
2025-06-18 12:30
Modified
2025-11-03 18:31
Details

In the Linux kernel, the following vulnerability has been resolved:

__legitimize_mnt(): check for MNT_SYNC_UMOUNT should be under mount_lock

... or we risk stealing final mntput from sync umount - raising mnt_count after umount(2) has verified that victim is not busy, but before it has set MNT_SYNC_UMOUNT; in that case __legitimize_mnt() doesn't see that it's safe to quietly undo mnt_count increment and leaves dropping the reference to caller, where it'll be a full-blown mntput().

Check under mount_lock is needed; leaving the current one done before taking that makes no sense - it's nowhere near common enough to bother with.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38058"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-18T10:15:38Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\n__legitimize_mnt(): check for MNT_SYNC_UMOUNT should be under mount_lock\n\n... or we risk stealing final mntput from sync umount - raising mnt_count\nafter umount(2) has verified that victim is not busy, but before it\nhas set MNT_SYNC_UMOUNT; in that case __legitimize_mnt() doesn\u0027t see\nthat it\u0027s safe to quietly undo mnt_count increment and leaves dropping\nthe reference to caller, where it\u0027ll be a full-blown mntput().\n\nCheck under mount_lock is needed; leaving the current one done before\ntaking that makes no sense - it\u0027s nowhere near common enough to bother\nwith.",
  "id": "GHSA-5rcm-hxrf-mw27",
  "modified": "2025-11-03T18:31:19Z",
  "published": "2025-06-18T12:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38058"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/250cf3693060a5f803c5f1ddc082bb06b16112a9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/628fb00195ce21a90cf9e4e3d105cd9e58f77b40"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8cafd7266fa02e0863bacbf872fe635c0b9725eb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b0915e72b3cf52474dcee0b24a2f99d93e604a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b55996939c71a3e1a38f3cdc6a8859797efc9083"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b89eb56a378b7b2c1176787fc228d0a57172bdd5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d8ece4ced3b051e656c77180df2e69e19e24edc1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f6d45fd92f62845cbd1eb5128fd8f0ed7d0c5a42"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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