{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53398",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53398"
  ],
  "published": "2026-07-19T12:02:32Z",
  "summary": "NFSD: Fix SECINFO_NO_NAME decode error cleanup",
  "details": "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().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
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  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "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."
    }
  }
}