CVE-2026-53398 (GCVE-0-2026-53398)
Vulnerability from cvelistv5
Published
2026-07-19 12:01
Modified
2026-08-17 04:50
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix SECINFO_NO_NAME decode error cleanup nfsd4_decode_secinfo_no_name() currently initializes sin_exp after decoding sin_style. If the XDR stream is truncated, the decoder returns nfserr_bad_xdr before sin_exp is initialized. Since commit 3fdc54646234 ("NFSD: Reduce amount of struct nfsd4_compoundargs that needs clearing"), the inline iops array is not cleared between RPC calls. A failed SECINFO_NO_NAME decode can therefore leave sin_exp holding stale union contents from a previous operation. The error response path still invokes nfsd4_secinfo_no_name_release(), which calls exp_put() on a non-NULL sin_exp. Initialize sin_exp before the first failable decode step, matching nfsd4_decode_secinfo().
References
Impacted products
Vendor Product Version
Linux Linux Version: 5e76b25d7cc82c148d391c0c43b884e6427cb302
Version: 07b68ff5c71cf4ed5443016d8eb116863c0a4d88
Version: 3fdc546462348b8a497c72bc894e0cde9f10fc40
Version: 3fdc546462348b8a497c72bc894e0cde9f10fc40
Version: 3fdc546462348b8a497c72bc894e0cde9f10fc40
Version: 3fdc546462348b8a497c72bc894e0cde9f10fc40
Version: 3fdc546462348b8a497c72bc894e0cde9f10fc40
Version: 3fdc546462348b8a497c72bc894e0cde9f10fc40
Version: 5.10.220   ≤
Version: 5.15.154   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfs4xdr.c"
          ],
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        {
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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": "6.1"
            },
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.177",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.144",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.95",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.38",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.3",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.260",
                  "versionStartIncluding": "5.10.220",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.211",
                  "versionStartIncluding": "5.15.154",
                  "vulnerable": true
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                {
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                  "versionEndExcluding": "6.1.177",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.144",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
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                {
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                  "versionStartIncluding": "6.1",
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                },
                {
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                },
                {
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                  "versionEndExcluding": "7.1.3",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Fix SECINFO_NO_NAME decode error cleanup\n\nnfsd4_decode_secinfo_no_name() currently initializes sin_exp after\ndecoding sin_style. If the XDR stream is truncated, the decoder returns\nnfserr_bad_xdr before sin_exp is initialized.\n\nSince commit 3fdc54646234 (\"NFSD: Reduce amount of struct\nnfsd4_compoundargs that needs clearing\"), the inline iops array is not\ncleared between RPC calls. A failed SECINFO_NO_NAME decode can therefore\nleave sin_exp holding stale union contents from a previous operation.\n\nThe error response path still invokes nfsd4_secinfo_no_name_release(),\nwhich calls exp_put() on a non-NULL sin_exp.\n\nInitialize sin_exp before the first failable decode step, matching\nnfsd4_decode_secinfo()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The bug is in nfsd4_decode_secinfo_no_name() on the NFSv4 COMPOUND RPC decode path; nfsd is an in-kernel network file server reached remotely over TCP/UDP port 2049 by any client that can connect.\nAC:L - An attacker on the same TCP connection can first send a valid SECINFO_NO_NAME compound to leave a dangling sin_exp in the reused iops[] slot, then send a truncated SECINFO_NO_NAME to trigger nfserr_bad_xdr and nfsd4_secinfo_no_name_release() without re-initializing sin_exp.\nPR:N - Exploitation requires only network reachability to nfsd and standard NFSv4.1 session setup (EXCHANGE_ID/CREATE_SESSION/SEQUENCE); default exports accept RPC_AUTH_NULL with no local privileges, matching an unauthenticated remote attacker on a misconfigured or internet-exposed NFS server.\nUI:N - No victim user action is required; the attacker triggers the bug entirely by sending crafted NFSv4 COMPOUND RPC requests to the server.\nS:U - Impact is confined to kernel nfsd/export-cache memory mismanagement on the NFS server; it does not cross a VM, container, or IOMMU security boundary.\nC:H - The stale sin_exp causes exp_put()/cache_put() on an uninitialized or already-freed svc_export pointer, corrupting export-cache refcounts and creating a use-after-free that can be leveraged for arbitrary kernel memory disclosure.\nI:H - Incorrect kref_put() on a dangling or garbage svc_export pointer is exploitable memory corruption that can lead to further heap manipulation and potential arbitrary kernel code execution, not merely a bounded error.\nA:H - Calling exp_put() on an invalid pointer reliably causes kernel oops/panic or premature export-cache destruction, producing high availability impact including NFS service disruption and possible full kernel crash."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:50:50.328Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8836405abdc53ca3dd5fc68b2cf6f8f012fad011"
        },
        {
          "url": "https://git.kernel.org/stable/c/49de5d31dd8fdebf78bdeaf196b0ca5cd5c75439"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ec37edcb534f3fc92304be236d37f08e6545585"
        },
        {
          "url": "https://git.kernel.org/stable/c/1e04be34cafae119e82bcaccd6d28a20f72a3647"
        },
        {
          "url": "https://git.kernel.org/stable/c/161d1aaeb04d620d3692639700512bb5038c1e10"
        },
        {
          "url": "https://git.kernel.org/stable/c/c8a24effd96d4779e2ad779654682304491c55a5"
        },
        {
          "url": "https://git.kernel.org/stable/c/46eb17d45be69d28c7a23ea03283b207426a8232"
        },
        {
          "url": "https://git.kernel.org/stable/c/9e18e83b8846a5c3fe13fc8a464b4865d33996c6"
        }
      ],
      "title": "NFSD: Fix SECINFO_NO_NAME decode error cleanup",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53398",
    "datePublished": "2026-07-19T12:01:59.507Z",
    "dateReserved": "2026-06-09T07:44:35.402Z",
    "dateUpdated": "2026-08-17T04:50:50.328Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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