{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89684",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89684"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "nfsd: fix cpntf publish race in nfs4_init_cp_state",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix cpntf publish race in nfs4_init_cp_state\n\nnfs4_alloc_init_cpntf_state() published the new cpntf entry into the\ns2s_cp_stateids IDR (with cs_type set) in one s2s_cp_lock section, then\ntook the lock again to list_add() it onto p_stid->sc_cp_list. In the gap\nthe entry is reachable by so_id but cp_list is still {NULL,NULL} from\nkzalloc. A racing OFFLOAD_CANCEL (so_id is echoed to the client as\ncnr_stateid, so any NFSv4.2 client can drive it) reaches\nmanage_cpntf_state() -> _free_cpntf_state_locked() and does list_del() on\nthe zeroed list_head, oopsing the server.\n\nFold the cs_type assignment and the list_add() into the same critical\nsection as idr_alloc_cyclic(), so a concurrent lookup either misses the\nentry or sees a fully linked cp_list. INIT_LIST_HEAD() the entry after\nallocation and switch _free_cpntf_state_locked() to list_del_init() so a\nstale unlink is a no-op. nfs4_init_copy_state() passes NULL p_stid and\nskips the list_add, preserving NFS4_COPY_STID semantics.",
  "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-2026-89684"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/63e18fc65587fd3f7b4c6d70e96d32fc41d82ba3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6ac469a274e3c7d87fc46ba46d83b95009680407"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8eeca993357a0bc35aaefebfd7462ac7b0a21d9a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bfeac42d9074e539bacd1898dd8c14b7f5776620"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/21d6c5957f5ca97d7352e60f55ea412beb9419f5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a631a26a8777bb235eabd478bbbaf26a4db750bf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c7270f62e7a05a2ee68aa2b74262b658a14463bd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/be3a5c1d857b0dcbc11796cea603ef25834f75b2"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The flaw is in nfsd NFSv4.2 COPY_NOTIFY/OFFLOAD_CANCEL (nfsd4_copy_notify, nfs4_alloc_init_cpntf_state, manage_cpntf_state). Compounds reach nfsd4_proc_compound via svc_process on TCP/2049, so a remote NFS client triggers the published cpntf IDR entry over the network.\nAC:L - The attacker drives both sides: COPY_NOTIFY publishes the cpntf into s2s_cp_stateids while a concurrent OFFLOAD_CANCEL uses the leaked s2s_cp_cl_id and cyclic so_id to list_del the still-zeroed cp_list. The window is retryable on multiple session slots with no victim-controlled state.\nPR:N - Default AUTH_SYS/AUTH_NULL nfsd exports do no cryptographic authentication. Any host allowed by the export ACL can EXCHANGE_ID/CREATE_SESSION, OPEN a readable file, and issue COPY_NOTIFY and OFFLOAD_CANCEL; no local account or capability on the NFS server is required.\nUI:N - The attacking NFS client sends COPY_NOTIFY and the concurrent OFFLOAD_CANCEL itself; no victim user or administrator action on the NFS server is required at attack time.\nS:U - list_del of the uninitialized cp_list oopses an nfsd worker in the host kernel copy-notify tables. Impact stays in that kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:N - The race is list_del on a kzalloc'd nfs4_cpntf_state.cp_list still {NULL,NULL}, a NULL-pointer dereference in __list_del. It oopses without reading kernel memory or providing an information-disclosure primitive.\nI:N - The only write is next->prev/prev->next through NULL list pointers from kzalloc; a remote NFS client cannot map the NULL page, so this is not a kernel write or control-flow hijack primitive.\nA:H - list_del on the zeroed list_head oopses or panics the nfsd thread (and can leak s2s_cp_lock). The attacker can repeat the concurrent COMPOUND sequence to deny NFS service and take down the server."
    }
  }
}