GHSA-C3J4-C39C-W5R2

Vulnerability from github – Published: 2025-09-05 18:31 – Updated: 2026-05-12 15:31
VLAI
Details

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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-38711"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-04T16:15:40Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-c3j4-c39c-w5r2",
  "modified": "2026-05-12T15:31:01Z",
  "published": "2025-09-05T18:31:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38711"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1e858a7a51c7b8b009d8f246de7ceb7743b44a71"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/814cfdb6358d9b84fcbec9918c8f938cc096a43a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9d5012ffe14120f978ee34aef4df3d6cb026b7c4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a726fef6d7d4cfc365d3434e3916dbfe78991a33"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a7dddd62578c2eb6cb28b8835556a121b5157323"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ac98d54630d5b52e3f684d872f0d82c06c418ea9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5fc1400a34b4ea5e8f2ce296ea12bf8c8421694"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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