ghsa-25rg-2wrr-633h
Vulnerability from github
Published
2025-10-24 12:30
Modified
2025-10-29 15:31
Details

In the Linux kernel, the following vulnerability has been resolved:

ipvs: Defer ip_vs_ftp unregister during netns cleanup

On the netns cleanup path, __ip_vs_ftp_exit() may unregister ip_vs_ftp before connections with valid cp->app pointers are flushed, leading to a use-after-free.

Fix this by introducing a global exiting_module flag, set to true in ip_vs_ftp_exit() before unregistering the pernet subsystem. In __ip_vs_ftp_exit(), skip ip_vs_ftp unregister if called during netns cleanup (when exiting_module is false) and defer it to __ip_vs_cleanup_batch(), which unregisters all apps after all connections are flushed. If called during module exit, unregister ip_vs_ftp immediately.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-40018"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-24T12:15:37Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: Defer ip_vs_ftp unregister during netns cleanup\n\nOn the netns cleanup path, __ip_vs_ftp_exit() may unregister ip_vs_ftp\nbefore connections with valid cp-\u003eapp pointers are flushed, leading to a\nuse-after-free.\n\nFix this by introducing a global `exiting_module` flag, set to true in\nip_vs_ftp_exit() before unregistering the pernet subsystem. In\n__ip_vs_ftp_exit(), skip ip_vs_ftp unregister if called during netns\ncleanup (when exiting_module is false) and defer it to\n__ip_vs_cleanup_batch(), which unregisters all apps after all connections\nare flushed. If called during module exit, unregister ip_vs_ftp\nimmediately.",
  "id": "GHSA-25rg-2wrr-633h",
  "modified": "2025-10-29T15:31:52Z",
  "published": "2025-10-24T12:30:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40018"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/134121bfd99a06d44ef5ba15a9beb075297c0821"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1d79471414d7b9424d699afff2aa79fff322f52d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/421b1ae1574dfdda68b835c15ac4921ec0030182"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/53717f8a4347b78eac6488072ad8e5adbaff38d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a6ecab3847c213ce2855b0378e63ce839085de3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8cbe2a21d85727b66d7c591fd5d83df0d8c4f757"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a343811ef138a265407167294275201621e9ebb2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dc1a481359a72ee7e548f1f5da671282a7c13b8f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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