{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89688",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89688"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "nfsd: drop the stateid, not the stateowner, on seqid_op replay retry",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: drop the stateid, not the stateowner, on seqid_op replay retry\n\nIn nfs4_preprocess_seqid_op() the stateid is obtained from\nnfsd4_lookup_stateid(), which holds a reference on the nfs4_stid\n(sc_count) but takes no reference on the stateowner. openlockstateid()\nmerely casts that stid and likewise takes no reference.\n\nWhen nfsd4_cstate_assign_replay() returns -EAGAIN (the replay owner is\nbeing torn down, RP_UNHASHED) it has not taken a stateowner reference on\nthat path. The error handling nevertheless called\nnfs4_put_stateowner(stp->st_stateowner), dropping an so_count reference\nthe function never acquired -- risking a stateowner refcount underflow and\nuse-after-free -- while leaking the sc_count reference held on the stid.\nThe leaked stid reference can also stall a concurrent\nnfsd4_close_open_stateid() waiting for sc_count to drop.\n\nDrop the reference actually held -- the stid -- before retrying. The\nstateowner stays alive through the reference held by the stid. This mirrors\nthe open path in nfsd4_process_open1(), where the put balances a reference\nthat path explicitly holds on the stateowner.",
  "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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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89688"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/69ed78b6b947c9257213164678b4edf17533093b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/00843074d9b84824552c9679d423d29500ca5de0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f7cb90ddc021747fc9abfd4cf5252d425fd34eec"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5e4627d3513e60accfce9d5f4c7fa95251ef93d6"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-13T06:49:25Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - nfsd processes NFSv4 COMPOUND ops (CLOSE, OPEN_DOWNGRADE, LOCK, OPEN_CONFIRM) in the in-kernel NFS server on TCP/UDP 2049; those handlers call nfs4_preprocess_seqid_op(), so a remote peer reaches the bug with no local access.\nAC:L - A remote NFSv4.0 client drives both sides by sending concurrent CLOSE and another seqid-mutating op on the same openowner; CLOSE's move_to_close_lru() sets RP_UNHASHED and waits on sc_count, so the window is attacker-controlled and retryable.\nPR:N - Typical nfsd exports use AUTH_SYS/AUTH_NULL, so RPC uids are self-asserted and not cryptographically verified; any host allowed by the export list can SETCLIENTID, OPEN, then CLOSE/OPEN_DOWNGRADE with no local Linux account.\nUI:N - The attacker issues the NFSv4 COMPOUND requests itself; no victim on the server must mount a filesystem, open a file, or take any other action.\nS:U - The underflow frees an nfsd nfs4_stateowner in the NFS server kernel; impact stays in that kernel and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - nfs4_put_stateowner() drops an so_count the seqid path never took, freeing the stateowner while the stid and retry loop still use it; that UAF enables slab reclaim and kernel memory disclosure.\nI:H - The same UAF exposes so_ops->so_unhash/so_free function pointers and list writes under cl_lock, yielding a kernel write and control-flow hijack primitive.\nA:H - The UAF oopses or panics nfsd; the leaked stid sc_count also leaves move_to_close_lru() waiting forever for sc_count==2, hanging an nfsd thread, and the -EAGAIN retry can spin while RP_UNHASHED stays set."
    }
  }
}