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CVE-2025-38711

Full vulnerability record from the local CVENow database.

Description

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.

Severity
MEDIUM
CVSS score
5.5 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-04 16:15:40.280000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON 
{
  "id": "CVE-2025-38711",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-09-04T16:15:40.280",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Modified",
  "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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsmb/server: evitar interbloqueo al enlazar con ReplaceIfExists\n\nSi se llama a smb2_create_link() con ReplaceIfExists establecido y el nombre existe, entonces ocurrirá un interbloqueo.\n\nksmbd_vfs_kern_path_locked() regresará con éxito y el directorio padre estará bloqueado. ksmbd_vfs_remove_file() entonces eliminará el archivo. ksmbd_vfs_link() entonces será llamado mientras el padre aún esté bloqueado. Intentará bloquear el mismo padre y se interbloqueará.\n\nEste parche mueve la llamada a ksmbd_vfs_kern_path_unlock() a *antes* de ksmbd_vfs_link() y luego simplifica el código, eliminando la variable de bandera file_present."
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      "affectedData": [
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          "vendor": "Siemens",
          "product": "SIMATIC CN 4100",
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          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6
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  "weaknesses": [
    {
      "source": "[email protected]",
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      "description": [
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          "lang": "en",
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