CVE-2025-38231 (GCVE-0-2025-38231)
Vulnerability from cvelistv5
Published
2025-07-04 13:37
Modified
2025-07-28 04:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: Initialize ssc before laundromat_work to prevent NULL dereference In nfs4_state_start_net(), laundromat_work may access nfsd_ssc through nfs4_laundromat -> nfsd4_ssc_expire_umount. If nfsd_ssc isn't initialized, this can cause NULL pointer dereference. Normally the delayed start of laundromat_work allows sufficient time for nfsd_ssc initialization to complete. However, when the kernel waits too long for userspace responses (e.g. in nfs4_state_start_net -> nfsd4_end_grace -> nfsd4_record_grace_done -> nfsd4_cld_grace_done -> cld_pipe_upcall -> __cld_pipe_upcall -> wait_for_completion path), the delayed work may start before nfsd_ssc initialization finishes. Fix this by moving nfsd_ssc initialization before starting laundromat_work.
References
Impacted products
Vendor Product Version
Linux Linux Version: a4bc287943f5695209ff36bdc89f17b48d68fae7
Version: f4e44b393389c77958f7c58bf4415032b4cda15b
Version: f4e44b393389c77958f7c58bf4415032b4cda15b
Version: f4e44b393389c77958f7c58bf4415032b4cda15b
Version: f4e44b393389c77958f7c58bf4415032b4cda15b
Version: f4e44b393389c77958f7c58bf4415032b4cda15b
Version: f4e44b393389c77958f7c58bf4415032b4cda15b
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfssvc.c"
          ],
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          "vendor": "Linux",
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.14"
            },
            {
              "lessThan": "5.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.239",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.186",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.95",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.239",
                  "versionStartIncluding": "5.10.220",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.186",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: Initialize ssc before laundromat_work to prevent NULL dereference\n\nIn nfs4_state_start_net(), laundromat_work may access nfsd_ssc through\nnfs4_laundromat -\u003e nfsd4_ssc_expire_umount. If nfsd_ssc isn\u0027t initialized,\nthis can cause NULL pointer dereference.\n\nNormally the delayed start of laundromat_work allows sufficient time for\nnfsd_ssc initialization to complete. However, when the kernel waits too\nlong for userspace responses (e.g. in nfs4_state_start_net -\u003e\nnfsd4_end_grace -\u003e nfsd4_record_grace_done -\u003e nfsd4_cld_grace_done -\u003e\ncld_pipe_upcall -\u003e __cld_pipe_upcall -\u003e wait_for_completion path), the\ndelayed work may start before nfsd_ssc initialization finishes.\n\nFix this by moving nfsd_ssc initialization before starting laundromat_work."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:15:46.499Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/deaeb74ae9318252829c59a84a7d2316fc335660"
        },
        {
          "url": "https://git.kernel.org/stable/c/0fccf5f01ed28725cc313a66ca1247eef911d55e"
        },
        {
          "url": "https://git.kernel.org/stable/c/a97668ec6d73dab237cd1c15efe012a10090a4ed"
        },
        {
          "url": "https://git.kernel.org/stable/c/5060e1a5fef184bd11d298e3f0ee920d96a23236"
        },
        {
          "url": "https://git.kernel.org/stable/c/d622c2ee6c08147ab8c9b9e37d93b6e95d3258e0"
        },
        {
          "url": "https://git.kernel.org/stable/c/83ac1ba8ca102ab5c0ed4351f8ac6e74ac4d5d64"
        },
        {
          "url": "https://git.kernel.org/stable/c/b31da62889e6d610114d81dc7a6edbcaa503fcf8"
        }
      ],
      "title": "nfsd: Initialize ssc before laundromat_work to prevent NULL dereference",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38231",
    "datePublished": "2025-07-04T13:37:44.978Z",
    "dateReserved": "2025-04-16T04:51:23.996Z",
    "dateUpdated": "2025-07-28T04:15:46.499Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38231\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-04T14:15:32.683\",\"lastModified\":\"2025-07-08T16:18:53.607\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnfsd: Initialize ssc before laundromat_work to prevent NULL dereference\\n\\nIn nfs4_state_start_net(), laundromat_work may access nfsd_ssc through\\nnfs4_laundromat -\u003e nfsd4_ssc_expire_umount. If nfsd_ssc isn\u0027t initialized,\\nthis can cause NULL pointer dereference.\\n\\nNormally the delayed start of laundromat_work allows sufficient time for\\nnfsd_ssc initialization to complete. However, when the kernel waits too\\nlong for userspace responses (e.g. in nfs4_state_start_net -\u003e\\nnfsd4_end_grace -\u003e nfsd4_record_grace_done -\u003e nfsd4_cld_grace_done -\u003e\\ncld_pipe_upcall -\u003e __cld_pipe_upcall -\u003e wait_for_completion path), the\\ndelayed work may start before nfsd_ssc initialization finishes.\\n\\nFix this by moving nfsd_ssc initialization before starting laundromat_work.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nfsd: Inicializar ssc antes de laundromat_work para evitar la desreferencia de punteros NULL. En nfs4_state_start_net(), laundromat_work puede acceder a nfsd_ssc a trav\u00e9s de nfs4_laundromat -\u0026gt; nfsd4_ssc_expire_umount. Si nfsd_ssc no se inicializa, esto puede causar la desreferencia de punteros NULL. Normalmente, el inicio retrasado de laundromat_work permite que la inicializaci\u00f3n de nfsd_ssc se complete con tiempo suficiente. Sin embargo, cuando el n\u00facleo espera demasiado tiempo las respuestas del espacio de usuario (p. ej., en la ruta nfs4_state_start_net -\u0026gt; nfsd4_end_grace -\u0026gt; nfsd4_record_grace_done -\u0026gt; nfsd4_cld_grace_done -\u0026gt; cld_pipe_upcall -\u0026gt; __cld_pipe_upcall -\u0026gt; wait_for_completion), el trabajo retrasado puede comenzar antes de que finalice la inicializaci\u00f3n de nfsd_ssc. Para solucionar esto, mueva la inicializaci\u00f3n de nfsd_ssc antes de iniciar laundromat_work.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0fccf5f01ed28725cc313a66ca1247eef911d55e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5060e1a5fef184bd11d298e3f0ee920d96a23236\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/83ac1ba8ca102ab5c0ed4351f8ac6e74ac4d5d64\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a97668ec6d73dab237cd1c15efe012a10090a4ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b31da62889e6d610114d81dc7a6edbcaa503fcf8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d622c2ee6c08147ab8c9b9e37d93b6e95d3258e0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/deaeb74ae9318252829c59a84a7d2316fc335660\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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