CVE-2025-38058 (GCVE-0-2025-38058)
Vulnerability from cvelistv5
Published
2025-06-18 09:33
Modified
2026-10-15 21:52
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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: 48a066e72d970a3e225a9c18690d570c736fc455
Version: 48a066e72d970a3e225a9c18690d570c736fc455
Version: 48a066e72d970a3e225a9c18690d570c736fc455
Version: 48a066e72d970a3e225a9c18690d570c736fc455
Version: 48a066e72d970a3e225a9c18690d570c736fc455
Version: 48a066e72d970a3e225a9c18690d570c736fc455
Version: 48a066e72d970a3e225a9c18690d570c736fc455
Version: 48a066e72d970a3e225a9c18690d570c736fc455
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A stolen final `mntput()` drives `cleanup_mnt()`/`deactivate_super()` and `mnt_instance`/`mnt_mounts` list surgery outside the RCU-grace-period ordering the sync-umount path establishes, giving heap-spray and list-corruption write primitives usable for control-flow hijack.\\nA:H - The stolen reference produces refcount-imbalance `WARN_ON`s, mount/superblock teardown at an arbitrary later time after `umount(2)` reported success, and use-after-free oopses that panic the kernel.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"48a066e72d970a3e225a9c18690d570c736fc455\", \"lessThan\": \"628fb00195ce21a90cf9e4e3d105cd9e58f77b40\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"48a066e72d970a3e225a9c18690d570c736fc455\", \"lessThan\": \"b89eb56a378b7b2c1176787fc228d0a57172bdd5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"48a066e72d970a3e225a9c18690d570c736fc455\", \"lessThan\": \"f6d45fd92f62845cbd1eb5128fd8f0ed7d0c5a42\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"48a066e72d970a3e225a9c18690d570c736fc455\", \"lessThan\": \"9b0915e72b3cf52474dcee0b24a2f99d93e604a3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"48a066e72d970a3e225a9c18690d570c736fc455\", \"lessThan\": \"d8ece4ced3b051e656c77180df2e69e19e24edc1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"48a066e72d970a3e225a9c18690d570c736fc455\", \"lessThan\": \"8cafd7266fa02e0863bacbf872fe635c0b9725eb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"48a066e72d970a3e225a9c18690d570c736fc455\", \"lessThan\": \"b55996939c71a3e1a38f3cdc6a8859797efc9083\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"48a066e72d970a3e225a9c18690d570c736fc455\", \"lessThan\": \"250cf3693060a5f803c5f1ddc082bb06b16112a9\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/namespace.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.13\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.13\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.294\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.238\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.185\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.141\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.93\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.31\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.14.*\"}, {\"status\": \"unaffected\", \"version\": \"6.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/namespace.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/628fb00195ce21a90cf9e4e3d105cd9e58f77b40\"}, {\"url\": \"https://git.kernel.org/stable/c/b89eb56a378b7b2c1176787fc228d0a57172bdd5\"}, {\"url\": \"https://git.kernel.org/stable/c/f6d45fd92f62845cbd1eb5128fd8f0ed7d0c5a42\"}, {\"url\": \"https://git.kernel.org/stable/c/9b0915e72b3cf52474dcee0b24a2f99d93e604a3\"}, {\"url\": \"https://git.kernel.org/stable/c/d8ece4ced3b051e656c77180df2e69e19e24edc1\"}, {\"url\": \"https://git.kernel.org/stable/c/8cafd7266fa02e0863bacbf872fe635c0b9725eb\"}, {\"url\": \"https://git.kernel.org/stable/c/b55996939c71a3e1a38f3cdc6a8859797efc9083\"}, {\"url\": \"https://git.kernel.org/stable/c/250cf3693060a5f803c5f1ddc082bb06b16112a9\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.294\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.238\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.185\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.141\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.93\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.31\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14.9\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.15\", \"versionStartIncluding\": \"3.13\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:59:08.465Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-38058\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-15T21:52:06.947Z\", \"dateReserved\": \"2025-04-16T04:51:23.979Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-06-18T09:33:38.022Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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