CVE-2025-40018 (GCVE-0-2025-40018)
Vulnerability from cvelistv5
Published
2025-10-24 11:44
Modified
2025-10-29 13:19
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 61b1ab4583e275af216c8454b9256de680499b19
Version: 61b1ab4583e275af216c8454b9256de680499b19
Version: 61b1ab4583e275af216c8454b9256de680499b19
Version: 61b1ab4583e275af216c8454b9256de680499b19
Version: 61b1ab4583e275af216c8454b9256de680499b19
Version: 61b1ab4583e275af216c8454b9256de680499b19
Version: 61b1ab4583e275af216c8454b9256de680499b19
Version: 61b1ab4583e275af216c8454b9256de680499b19
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/ipvs/ip_vs_ftp.c"
          ],
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              "version": "0",
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      ],
      "cpeApplicability": [
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-29T13:19:22.888Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8a6ecab3847c213ce2855b0378e63ce839085de3"
        },
        {
          "url": "https://git.kernel.org/stable/c/421b1ae1574dfdda68b835c15ac4921ec0030182"
        },
        {
          "url": "https://git.kernel.org/stable/c/1d79471414d7b9424d699afff2aa79fff322f52d"
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        },
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          "url": "https://git.kernel.org/stable/c/a343811ef138a265407167294275201621e9ebb2"
        },
        {
          "url": "https://git.kernel.org/stable/c/134121bfd99a06d44ef5ba15a9beb075297c0821"
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      ],
      "title": "ipvs: Defer ip_vs_ftp unregister during netns cleanup",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40018",
    "datePublished": "2025-10-24T11:44:28.955Z",
    "dateReserved": "2025-04-16T07:20:57.152Z",
    "dateUpdated": "2025-10-29T13:19:22.888Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40018\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-24T12:15:37.703\",\"lastModified\":\"2025-10-29T14:15:52.530\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/134121bfd99a06d44ef5ba15a9beb075297c0821\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1d79471414d7b9424d699afff2aa79fff322f52d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/421b1ae1574dfdda68b835c15ac4921ec0030182\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/53717f8a4347b78eac6488072ad8e5adbaff38d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8a6ecab3847c213ce2855b0378e63ce839085de3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8cbe2a21d85727b66d7c591fd5d83df0d8c4f757\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a343811ef138a265407167294275201621e9ebb2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dc1a481359a72ee7e548f1f5da671282a7c13b8f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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