fkie_cve-2025-38058
Vulnerability from fkie_nvd
Published
2025-06-18 10:15
Modified
2025-11-03 18:15
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/250cf3693060a5f803c5f1ddc082bb06b16112a9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/628fb00195ce21a90cf9e4e3d105cd9e58f77b40
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8cafd7266fa02e0863bacbf872fe635c0b9725eb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9b0915e72b3cf52474dcee0b24a2f99d93e604a3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b55996939c71a3e1a38f3cdc6a8859797efc9083
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b89eb56a378b7b2c1176787fc228d0a57172bdd5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d8ece4ced3b051e656c77180df2e69e19e24edc1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f6d45fd92f62845cbd1eb5128fd8f0ed7d0c5a42
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Impacted products
Vendor Product Version


To clipboard 

{
  "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."
    }
  ],
  "id": "CVE-2025-38058",
  "lastModified": "2025-11-03T18:15:59.970",
  "metrics": {},
  "published": "2025-06-18T10:15:38.590",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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