CVE-2025-38058 (GCVE-0-2025-38058)
Vulnerability from cvelistv5
Published
2025-06-18 09:33
Modified
2025-06-18 09:33
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
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          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T09:33:38.022Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/628fb00195ce21a90cf9e4e3d105cd9e58f77b40"
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          "url": "https://git.kernel.org/stable/c/d8ece4ced3b051e656c77180df2e69e19e24edc1"
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        },
        {
          "url": "https://git.kernel.org/stable/c/250cf3693060a5f803c5f1ddc082bb06b16112a9"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38058",
    "datePublished": "2025-06-18T09:33:38.022Z",
    "dateReserved": "2025-04-16T04:51:23.979Z",
    "dateUpdated": "2025-06-18T09:33:38.022Z",
    "state": "PUBLISHED"
  },
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38058\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T10:15:38.590\",\"lastModified\":\"2025-06-18T13:46:52.973\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: __legitimize_mnt(): la comprobaci\u00f3n de MNT_SYNC_UMOUNT debe estar bajo mount_lock... o corremos el riesgo de robar la mntput final de sync umount, lo que genera mnt_count despu\u00e9s de que umount(2) haya verificado que la v\u00edctima no est\u00e1 ocupada, pero antes de que haya establecido MNT_SYNC_UMOUNT. En ese caso, __legitimize_mnt() no considera que sea seguro deshacer silenciosamente el incremento de mnt_count y contin\u00faa eliminando la referencia al llamador, donde se ejecutar\u00e1 una mntput() completa. Es necesaria la comprobaci\u00f3n bajo mount_lock; dejar la actual activada antes de tomarla no tiene sentido; no es lo suficientemente com\u00fan como para molestarse en hacerlo.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/250cf3693060a5f803c5f1ddc082bb06b16112a9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/628fb00195ce21a90cf9e4e3d105cd9e58f77b40\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8cafd7266fa02e0863bacbf872fe635c0b9725eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9b0915e72b3cf52474dcee0b24a2f99d93e604a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b55996939c71a3e1a38f3cdc6a8859797efc9083\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b89eb56a378b7b2c1176787fc228d0a57172bdd5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d8ece4ced3b051e656c77180df2e69e19e24edc1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f6d45fd92f62845cbd1eb5128fd8f0ed7d0c5a42\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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