CVE-2025-38711 (GCVE-0-2025-38711)
Vulnerability from cvelistv5
Published
2025-09-04 15:33
Modified
2025-09-08 15:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: smb/server: avoid deadlock when linking with ReplaceIfExists If smb2_create_link() is called with ReplaceIfExists set and the name does exist then a deadlock will happen. ksmbd_vfs_kern_path_locked() will return with success and the parent directory will be locked. ksmbd_vfs_remove_file() will then remove the file. ksmbd_vfs_link() will then be called while the parent is still locked. It will try to lock the same parent and will deadlock. This patch moves the ksmbd_vfs_kern_path_unlock() call to *before* ksmbd_vfs_link() and then simplifies the code, removing the file_present flag variable.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1e858a7a51c7b8b009d8f246de7ceb7743b44a71
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/814cfdb6358d9b84fcbec9918c8f938cc096a43a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9d5012ffe14120f978ee34aef4df3d6cb026b7c4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a726fef6d7d4cfc365d3434e3916dbfe78991a33
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a7dddd62578c2eb6cb28b8835556a121b5157323
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ac98d54630d5b52e3f684d872f0d82c06c418ea9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d5fc1400a34b4ea5e8f2ce296ea12bf8c8421694
Impacted products
Vendor Product Version
Linux Linux Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
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   Linux Linux Version: 5.15
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/smb2pdu.c"
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/server: avoid deadlock when linking with ReplaceIfExists\n\nIf smb2_create_link() is called with ReplaceIfExists set and the name\ndoes exist then a deadlock will happen.\n\nksmbd_vfs_kern_path_locked() will return with success and the parent\ndirectory will be locked.  ksmbd_vfs_remove_file() will then remove the\nfile.  ksmbd_vfs_link() will then be called while the parent is still\nlocked.  It will try to lock the same parent and will deadlock.\n\nThis patch moves the ksmbd_vfs_kern_path_unlock() call to *before*\nksmbd_vfs_link() and then simplifies the code, removing the file_present\nflag variable."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-08T15:21:52.315Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/d5fc1400a34b4ea5e8f2ce296ea12bf8c8421694"
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      "title": "smb/server: avoid deadlock when linking with ReplaceIfExists",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38711",
    "datePublished": "2025-09-04T15:33:01.367Z",
    "dateReserved": "2025-04-16T04:51:24.033Z",
    "dateUpdated": "2025-09-08T15:21:52.315Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38711\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-04T16:15:40.280\",\"lastModified\":\"2025-09-05T17:47:24.833\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsmb/server: avoid deadlock when linking with ReplaceIfExists\\n\\nIf smb2_create_link() is called with ReplaceIfExists set and the name\\ndoes exist then a deadlock will happen.\\n\\nksmbd_vfs_kern_path_locked() will return with success and the parent\\ndirectory will be locked.  ksmbd_vfs_remove_file() will then remove the\\nfile.  ksmbd_vfs_link() will then be called while the parent is still\\nlocked.  It will try to lock the same parent and will deadlock.\\n\\nThis patch moves the ksmbd_vfs_kern_path_unlock() call to *before*\\nksmbd_vfs_link() and then simplifies the code, removing the file_present\\nflag variable.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1e858a7a51c7b8b009d8f246de7ceb7743b44a71\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/814cfdb6358d9b84fcbec9918c8f938cc096a43a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9d5012ffe14120f978ee34aef4df3d6cb026b7c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a726fef6d7d4cfc365d3434e3916dbfe78991a33\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7dddd62578c2eb6cb28b8835556a121b5157323\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ac98d54630d5b52e3f684d872f0d82c06c418ea9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d5fc1400a34b4ea5e8f2ce296ea12bf8c8421694\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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