{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53394",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53394"
  ],
  "published": "2026-07-19T12:02:32Z",
  "summary": "nfsd: avoid leaking pre-allocated openowner on unconfirmed retry race",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: avoid leaking pre-allocated openowner on unconfirmed retry race\n\nWhen find_or_alloc_open_stateowner() encounters an unconfirmed owner, it\ncalls release_openowner() and sets oo = NULL. Control then falls through\npast the `if (oo)` guard -- which would have freed any pre-allocated\n`new` -- and unconditionally executes `new = alloc_stateowner(...)`. If\n`new` was already allocated on a prior iteration, the pointer is\nsilently overwritten and the previous allocation (slab object + owner\nname buffer) is leaked.\n\nThis requires a race: two NFSv4.0 OPEN threads with the same owner\nstring, where a concurrent thread inserts a new unconfirmed owner into\nthe hash between retry iterations. The window is narrow but repeatable\nunder adversarial conditions.\n\nFix by adding `goto retry` after `oo = NULL` so the already-allocated\n`new` is reused on the next iteration rather than overwritten.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53394"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c9aefb2b5f11337c9202c5bd0c45d71198449718"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/017a6150106b054cc84d1b0582d97bd3a74d4281"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a10bf67fe06469a71a401f72f328237345d553c0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/57aee7a35bb12753057c5b65d72d1f46c0e95b07"
    }
  ],
  "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": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The flaw is in nfsd's NFSv4 OPEN handling, reachable remotely via NFS RPC on TCP/UDP port 2049 through svc_recv \u2192 NFSPROC4_COMPOUND \u2192 nfsd4_open \u2192 nfsd4_process_open1 \u2192 find_or_alloc_open_stateowner().\nAC:L - Exploitation requires a race between two NFSv4.0 OPEN requests with the same owner string, but the attacker controls both sides by issuing concurrent compounds from multiple connections; the fix commit itself states this is repeatable under adversarial conditions.\nPR:N - No local privileges on the server are required\u2014only remote NFSv4 client access to establish a clientid (SETCLIENTID/CONFIRM) and send concurrent OPEN operations; the leak occurs in nfsd4_process_open1 before export/file permission checks complete.\nUI:N - Exploitation is fully automated via concurrent NFS protocol requests and requires no action from any victim user on the server or client side.\nS:U - Impact is confined to kernel memory consumption within nfsd's security authority; there is no cross-boundary escape to other components or privilege domains.\nC:N - This is a pure memory leak where orphaned slab objects lose all kernel references; no out-of-bounds read, use-after-free, or other mechanism exposes kernel data to the attacker.\nI:N - The bug silently drops a pointer to an allocated object without corrupting adjacent memory or providing any write or control-flow primitive\u2014only heap memory is lost.\nA:H - Each successful race leaks a slab object plus an attacker-controlled owner-name buffer (up to NFS4_OPAQUE_LIMIT bytes), and the attack can be repeated indefinitely to cause unbounded kernel memory exhaustion, denying NFS service and potentially triggering system-wide OOM conditions."
    }
  }
}