CVE-2026-89680 (GCVE-0-2026-89680)
Vulnerability from cvelistv5
Published
2026-09-11 19:46
Modified
2026-10-21 12:48
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix nfsd_file leak on inter-server COPY setup failure When nfsd4_setup_inter_ssc() fails, nfsd4_copy() returns nfserr_offload_denied directly, bypassing the out: label where release_copy_files() would drop the nf_dst reference taken by nfs4_preprocess_stateid_op(). Each failed inter-server COPY leaks one nfsd_file, pinning file/inode/dentry/vfsmount. Fix by setting status and jumping to out: instead of returning directly.
References
Impacted products
Vendor Product Version
Linux Linux Version: ce0887ac96d35c7105090e166bb0807dc0a0e838
Version: ce0887ac96d35c7105090e166bb0807dc0a0e838
Version: ce0887ac96d35c7105090e166bb0807dc0a0e838
Version: ce0887ac96d35c7105090e166bb0807dc0a0e838
Version: ce0887ac96d35c7105090e166bb0807dc0a0e838
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfs4proc.c"
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          "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": "5.6"
            },
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              "status": "unaffected",
              "version": "0",
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            },
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              "version": "6.12.109",
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              "status": "unaffected",
              "version": "6.18.50",
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              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
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                {
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                  "versionEndExcluding": "6.12.109",
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                  "vulnerable": true
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                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix nfsd_file leak on inter-server COPY setup failure\n\nWhen nfsd4_setup_inter_ssc() fails, nfsd4_copy() returns\nnfserr_offload_denied directly, bypassing the out: label where\nrelease_copy_files() would drop the nf_dst reference taken by\nnfs4_preprocess_stateid_op(). Each failed inter-server COPY\nleaks one nfsd_file, pinning file/inode/dentry/vfsmount.\n\nFix by setting status and jumping to out: instead of returning\ndirectly."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - nfsd\u0027s NFSv4.2 OP_COPY is reached over TCP/2049: svc_recv to nfsd_dispatch to nfsd4_proc_compound to nfsd4_copy to nfsd4_setup_inter_ssc. A remote client triggers the leak with a COMPOUND; no local access to the server is required.\nAC:L - Once inter-server COPY offload is enabled, the attacker controls every trigger: async COPY on the wire, a valid dest write stateid, and a source nl4_server that makes nfsd4_interssc_connect fail (bad uaddr/netid or failed mount). No race or attacker-uncontrollable layout is required.\nPR:N - Under default AUTH_SYS, EXCHANGE_ID/CREATE_SESSION and OPEN verify no secret; a remote client permitted by the export asserts a UID and obtains write stateids. This matches PR:N on the same nfsd4_copy path (CVE-2024-53073, CVE-2024-50241).\nUI:N - The attacker\u0027s own NFSv4.2 COMPOUND traffic drives nfsd4_copy; no administrator or local user on the server must mount, open a file, or otherwise interact beyond nfsd already serving an export.\nS:U - The leaked nfsd_file reference pins file/inode/dentry/vfsmount inside the NFS server kernel\u0027s own security authority; there is no VM, IOMMU, or sandbox boundary crossing.\nC:N - The defect only skips nfsd_file_put() on an extra filecache reference taken by nfs4_preprocess_stateid_op(); there is no out-of-bounds read, use-after-free, or other disclosure of kernel memory to the client.\nI:N - COPY setup fails before nfsd_copy_range, so no file data is modified; the leaked reference is not attacker-controlled reused memory and yields no write or control-flow primitive.\nA:H - Each failed inter-server COPY permanently leaks one nfsd_file ref, pinning the dest file/inode/dentry/vfsmount. Repeating against many created-then-unlinked files unbounded-pins slab and inodes and blocks umount, enabling remote kernel memory exhaustion and NFS server DoS."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:48:17.853Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ab949252fdf102ae74329a0caa7995a849d0dafa"
        },
        {
          "url": "https://git.kernel.org/stable/c/1a6a41b848455bf6ba2c9da2dfb0730e608ce7ab"
        },
        {
          "url": "https://git.kernel.org/stable/c/424d5c95108a4809b832cb0a312c61de4aec0078"
        },
        {
          "url": "https://git.kernel.org/stable/c/6ed8d6de7ec90c4ba84eb82673058f506e5777fd"
        },
        {
          "url": "https://git.kernel.org/stable/c/88a76145451d703eedd867b5989bf73d17340399"
        }
      ],
      "title": "nfsd: fix nfsd_file leak on inter-server COPY setup failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89680",
    "datePublished": "2026-09-11T19:46:03.468Z",
    "dateReserved": "2026-09-11T19:38:34.748Z",
    "dateUpdated": "2026-10-21T12:48:17.853Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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