CVE-2025-38321 (GCVE-0-2025-38321)
Vulnerability from cvelistv5
Published
2025-07-10 08:14
Modified
2025-07-28 04:18
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: Log an error when close_all_cached_dirs fails Under low-memory conditions, close_all_cached_dirs() can't move the dentries to a separate list to dput() them once the locks are dropped. This will result in a "Dentry still in use" error, so add an error message that makes it clear this is what happened: [ 495.281119] CIFS: VFS: \\otters.example.com\share Out of memory while dropping dentries [ 495.281595] ------------[ cut here ]------------ [ 495.281887] BUG: Dentry ffff888115531138{i=78,n=/} still in use (2) [unmount of cifs cifs] [ 495.282391] WARNING: CPU: 1 PID: 2329 at fs/dcache.c:1536 umount_check+0xc8/0xf0 Also, bail out of looping through all tcons as soon as a single allocation fails, since we're already in trouble, and kmalloc() attempts for subseqeuent tcons are likely to fail just like the first one did.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/43f26094d6702e494e800532c3f1606e7a68eb30
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4479db143390bdcadc1561292aab579cdfa9f6c6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a2182743a8b4969481f64aec4908ff162e8a206c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b8ced2b9a23a1a2c1e0ed8d0d02512e51bdf38da
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
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        {
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          "product": "Linux",
          "programFiles": [
            "fs/smb/client/cached_dir.c"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: Log an error when close_all_cached_dirs fails\n\nUnder low-memory conditions, close_all_cached_dirs() can\u0027t move the\ndentries to a separate list to dput() them once the locks are dropped.\nThis will result in a \"Dentry still in use\" error, so add an error\nmessage that makes it clear this is what happened:\n\n[  495.281119] CIFS: VFS: \\\\otters.example.com\\share Out of memory while dropping dentries\n[  495.281595] ------------[ cut here ]------------\n[  495.281887] BUG: Dentry ffff888115531138{i=78,n=/}  still in use (2) [unmount of cifs cifs]\n[  495.282391] WARNING: CPU: 1 PID: 2329 at fs/dcache.c:1536 umount_check+0xc8/0xf0\n\nAlso, bail out of looping through all tcons as soon as a single\nallocation fails, since we\u0027re already in trouble, and kmalloc() attempts\nfor subseqeuent tcons are likely to fail just like the first one did."
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        "dateUpdated": "2025-07-28T04:18:34.550Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "title": "smb: Log an error when close_all_cached_dirs fails",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38321",
    "datePublished": "2025-07-10T08:14:57.046Z",
    "dateReserved": "2025-04-16T04:51:24.004Z",
    "dateUpdated": "2025-07-28T04:18:34.550Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38321\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-10T09:15:26.103\",\"lastModified\":\"2025-07-10T13:17:30.017\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsmb: Log an error when close_all_cached_dirs fails\\n\\nUnder low-memory conditions, close_all_cached_dirs() can\u0027t move the\\ndentries to a separate list to dput() them once the locks are dropped.\\nThis will result in a \\\"Dentry still in use\\\" error, so add an error\\nmessage that makes it clear this is what happened:\\n\\n[  495.281119] CIFS: VFS: \\\\\\\\otters.example.com\\\\share Out of memory while dropping dentries\\n[  495.281595] ------------[ cut here ]------------\\n[  495.281887] BUG: Dentry ffff888115531138{i=78,n=/}  still in use (2) [unmount of cifs cifs]\\n[  495.282391] WARNING: CPU: 1 PID: 2329 at fs/dcache.c:1536 umount_check+0xc8/0xf0\\n\\nAlso, bail out of looping through all tcons as soon as a single\\nallocation fails, since we\u0027re already in trouble, and kmalloc() attempts\\nfor subseqeuent tcons are likely to fail just like the first one did.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/43f26094d6702e494e800532c3f1606e7a68eb30\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4479db143390bdcadc1561292aab579cdfa9f6c6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a2182743a8b4969481f64aec4908ff162e8a206c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b8ced2b9a23a1a2c1e0ed8d0d02512e51bdf38da\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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