CVE-2025-40018

{
  "id": "CVE-2025-40018",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-10-24T12:15:37.703",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Deferred",
  "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->app 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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nipvs: Aplazar la anulación de registro de ip_vs_ftp durante la limpieza de netns\n\nEn la ruta de limpieza de netns, __ip_vs_ftp_exit() puede anular el registro de ip_vs_ftp antes de que se vacíen las conexiones con punteros cp->app válidos, lo que lleva a un uso después de liberación.\n\nEsto se soluciona introduciendo una bandera global 'exiting_module', establecida en verdadero en ip_vs_ftp_exit() antes de anular el registro del subsistema pernet. En __ip_vs_ftp_exit(), omitir la anulación de registro de ip_vs_ftp si se llama durante la limpieza de netns (cuando 'exiting_module' es falso) y aplazarla a __ip_vs_cleanup_batch(), que anula el registro de todas las aplicaciones después de que se vacían todas las conexiones. Si se llama durante la salida del módulo, anular el registro de ip_vs_ftp inmediatamente."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "net/netfilter/ipvs/ip_vs_ftp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "61b1ab4583e275af216c8454b9256de680499b19",
              "lessThan": "8a6ecab3847c213ce2855b0378e63ce839085de3",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "61b1ab4583e275af216c8454b9256de680499b19",
              "lessThan": "421b1ae1574dfdda68b835c15ac4921ec0030182",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "61b1ab4583e275af216c8454b9256de680499b19",
              "lessThan": "1d79471414d7b9424d699afff2aa79fff322f52d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "61b1ab4583e275af216c8454b9256de680499b19",
              "lessThan": "53717f8a4347b78eac6488072ad8e5adbaff38d9",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "61b1ab4583e275af216c8454b9256de680499b19",
              "lessThan": "8cbe2a21d85727b66d7c591fd5d83df0d8c4f757",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "61b1ab4583e275af216c8454b9256de680499b19",
              "lessThan": "dc1a481359a72ee7e548f1f5da671282a7c13b8f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "61b1ab4583e275af216c8454b9256de680499b19",
              "lessThan": "a343811ef138a265407167294275201621e9ebb2",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "61b1ab4583e275af216c8454b9256de680499b19",
              "lessThan": "134121bfd99a06d44ef5ba15a9beb075297c0821",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "net/netfilter/ipvs/ip_vs_ftp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "2.6.39",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "2.6.39",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.4.301",
              "lessThanOrEqual": "5.4.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.246",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.195",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.156",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.112",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.53",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.17.3",
              "lessThanOrEqual": "6.17.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-15T21:56:10.486457Z",
          "id": "CVE-2025-40018",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "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"
    }
  ]
}