nfsd: release layout stid on setlease failure

{
  "id": "a3407827b6814264a24cf4a2be35fb72172e4d2f0e2501c647efd5091b589729",
  "url": "https://osv.dev/vulnerability/CVE-2026-53399",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "nfsd: release layout stid on setlease failure",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: nfsd: release layout stid on setlease failure nfs4_alloc_stid() publishes the new stid into cl->cl_stateids via idr_alloc_cyclic() under cl_lock before returning to nfsd4_alloc_layout_stateid(). When nfsd4_layout_setlease() then fails, the error path frees the layout stateid directly with kmem_cache_free() without ever calling idr_remove(), leaving the IDR slot pointing at freed slab memory. Any subsequent IDR walker (states_show, client teardown) dereferences the dangling pointer. The correct teardown for an IDR-published stid is nfs4_put_stid(), which removes the IDR slot under cl_lock, dispatches sc_free (nfsd4_free_layout_stateid) to release ls->ls_file via nfsd4_close_layout(), and drops the nfs4_file reference in its tail. A second issue blocks that switch: nfsd4_free_layout_stateid() unconditionally inspects ls->ls_fence_work via delayed_work_pending() under ls_lock, but INIT_DELAYED_WORK(&ls->ls_fence_work, ...) currently runs only after the setlease call. On the setlease-failure path the destructor would touch an uninitialized delayed_work. nfsd4_alloc_layout_stateid() nfs4_alloc_stid() /* idr_alloc_cyclic under cl_lock */ nfsd4_layout_setlease() /* fails */ nfs4_put_stid() nfsd4_free_layout_stateid() delayed_work_pending(&ls->ls_fence_work) /* needs INIT */ nfsd4_close_layout() /* nfsd_file_put(ls->ls_file) */ put_nfs4_file() Fix by hoisting the ls_fenced / ls_fence_delay / INIT_DELAYED_WORK initial",
    "evidence": "osv:CVE-2026-53399",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.261",
            "evidence": "/affected/1/ranges"
          },
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            "value": "5.15.212",
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            "value": "7.1.3",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-53399",
      "aliases": [
        "CVE-2026-53399"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
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                  "fixed": "2e0a5d6d62600b8c614d1b55e50ef94035d6adf9"
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                  "fixed": "7bbb7ce74051c8be4b69ff44ce3db370600dae61"
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          "database_specific": {
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        {
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              "type": "ECOSYSTEM",
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      ],
      "modified": "2026-10-28T02:30:24.967774690Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2e0a5d6d62600b8c614d1b55e50ef94035d6adf9",
        "https://git.kernel.org/stable/c/30d55c8aabb261bc3f427d6b9aae7ef6206063f9",
        "https://git.kernel.org/stable/c/48a586e382e4db1dbf958d44b63e081df5f8ed04",
        "https://git.kernel.org/stable/c/7bbb7ce74051c8be4b69ff44ce3db370600dae61",
        "https://git.kernel.org/stable/c/83c2b7797742339bb768f83935f7ca33950db138",
        "https://git.kernel.org/stable/c/8dee7c278f1c2b5bb80e17a6281c3812fc8b0cdd",
        "https://git.kernel.org/stable/c/d369e5edfaaf83a448016e2f1da392b2174be801",
        "https://git.kernel.org/stable/c/d788ef40a7517d22c97ab01700e4ae4c611b6f2f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53399.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53399",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53399.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53399",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491640,
  "published_at": "2026-07-19T12:02:00.055+00:00"
}