CVE-2025-38567 (GCVE-0-2025-38567)
Vulnerability from cvelistv5
Published
2025-08-19 17:02
Modified
2025-09-29 05:53
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: avoid ref leak in nfsd_open_local_fh() If two calls to nfsd_open_local_fh() race and both successfully call nfsd_file_acquire_local(), they will both get an extra reference to the net to accompany the file reference stored in *pnf. One of them will fail to store (using xchg()) the file reference in *pnf and will drop that reference but WON'T drop the accompanying reference to the net. This leak means that when the nfs server is shut down it will hang in nfsd_shutdown_net() waiting for &nn->nfsd_net_free_done. This patch adds the missing nfsd_net_put().
References
Impacted products
Vendor Product Version
Linux Linux Version: 986a21ace186433e0397a59491646edad8c8d636
Version: e6f7e1487ab528a6c653bd0d42812ff2942846cd
Version: e6f7e1487ab528a6c653bd0d42812ff2942846cd
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/localio.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fcb0a417fddb605530c4837e0996620f8ed38023",
              "status": "affected",
              "version": "986a21ace186433e0397a59491646edad8c8d636",
              "versionType": "git"
            },
            {
              "lessThan": "c4bf8f26c51e51bbb840935659a7b3b65a802c07",
              "status": "affected",
              "version": "e6f7e1487ab528a6c653bd0d42812ff2942846cd",
              "versionType": "git"
            },
            {
              "lessThan": "e5a73150776f18547ee685c9f6bfafe549714899",
              "status": "affected",
              "version": "e6f7e1487ab528a6c653bd0d42812ff2942846cd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/localio.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.10",
                  "versionStartIncluding": "6.15.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.1",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: avoid ref leak in nfsd_open_local_fh()\n\nIf two calls to nfsd_open_local_fh() race and both successfully call\nnfsd_file_acquire_local(), they will both get an extra reference to the\nnet to accompany the file reference stored in *pnf.\n\nOne of them will fail to store (using xchg()) the file reference in\n*pnf and will drop that reference but WON\u0027T drop the accompanying\nreference to the net.  This leak means that when the nfs server is shut\ndown it will hang in nfsd_shutdown_net() waiting for\n\u0026nn-\u003enfsd_net_free_done.\n\nThis patch adds the missing nfsd_net_put()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T05:53:56.067Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fcb0a417fddb605530c4837e0996620f8ed38023"
        },
        {
          "url": "https://git.kernel.org/stable/c/c4bf8f26c51e51bbb840935659a7b3b65a802c07"
        },
        {
          "url": "https://git.kernel.org/stable/c/e5a73150776f18547ee685c9f6bfafe549714899"
        }
      ],
      "title": "nfsd: avoid ref leak in nfsd_open_local_fh()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38567",
    "datePublished": "2025-08-19T17:02:48.306Z",
    "dateReserved": "2025-04-16T04:51:24.025Z",
    "dateUpdated": "2025-09-29T05:53:56.067Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38567\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-19T17:15:33.380\",\"lastModified\":\"2025-08-20T14:40:17.713\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnfsd: avoid ref leak in nfsd_open_local_fh()\\n\\nIf two calls to nfsd_open_local_fh() race and both successfully call\\nnfsd_file_acquire_local(), they will both get an extra reference to the\\nnet to accompany the file reference stored in *pnf.\\n\\nOne of them will fail to store (using xchg()) the file reference in\\n*pnf and will drop that reference but WON\u0027T drop the accompanying\\nreference to the net.  This leak means that when the nfs server is shut\\ndown it will hang in nfsd_shutdown_net() waiting for\\n\u0026nn-\u003enfsd_net_free_done.\\n\\nThis patch adds the missing nfsd_net_put().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nfsd: evitar fuga de referencia en nfsd_open_local_fh(). Si se ejecutan dos llamadas a nfsd_open_local_fh() y ambas invocan correctamente nfsd_file_acquire_local(), ambas obtendr\u00e1n una referencia adicional a la red que acompa\u00f1a a la referencia del archivo almacenada en *pnf. Una de ellas no almacenar\u00e1 (mediante xchg()) la referencia del archivo en *pnf y la eliminar\u00e1, pero NO eliminar\u00e1 la referencia que la acompa\u00f1a a la red. Esta fuga significa que, al apagar el servidor NFS, se bloquear\u00e1 en nfsd_shutdown_net() esperando \u0026amp;nn-\u0026gt;nfsd_net_free_done. Este parche a\u00f1ade la funci\u00f3n nfsd_net_put() que faltaba.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/c4bf8f26c51e51bbb840935659a7b3b65a802c07\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e5a73150776f18547ee685c9f6bfafe549714899\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fcb0a417fddb605530c4837e0996620f8ed38023\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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