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
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/cached_dir.c"
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          "vendor": "Linux",
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          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "6.6.95",
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              "negate": false,
              "operator": "OR"
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      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:18:34.550Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b8ced2b9a23a1a2c1e0ed8d0d02512e51bdf38da"
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          "url": "https://git.kernel.org/stable/c/43f26094d6702e494e800532c3f1606e7a68eb30"
        },
        {
          "url": "https://git.kernel.org/stable/c/4479db143390bdcadc1561292aab579cdfa9f6c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/a2182743a8b4969481f64aec4908ff162e8a206c"
        }
      ],
      "title": "smb: Log an error when close_all_cached_dirs fails",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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",
  "dataVersion": "5.1",
  "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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