{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "624322f1adc58acd0b69f77a6ddc764207e97241"
            },
            {
              "fixed": "63e18fc65587fd3f7b4c6d70e96d32fc41d82ba3"
            },
            {
              "fixed": "6ac469a274e3c7d87fc46ba46d83b95009680407"
            },
            {
              "fixed": "8eeca993357a0bc35aaefebfd7462ac7b0a21d9a"
            },
            {
              "fixed": "bfeac42d9074e539bacd1898dd8c14b7f5776620"
            },
            {
              "fixed": "21d6c5957f5ca97d7352e60f55ea412beb9419f5"
            },
            {
              "fixed": "a631a26a8777bb235eabd478bbbaf26a4db750bf"
            },
            {
              "fixed": "c7270f62e7a05a2ee68aa2b74262b658a14463bd"
            },
            {
              "fixed": "be3a5c1d857b0dcbc11796cea603ef25834f75b2"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.6.0"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.109"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89684.json"
  },
  "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-\u003esc_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() -\u003e _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.",
  "id": "CVE-2026-89684",
  "modified": "2026-09-15T03:31:00.279528330Z",
  "published": "2026-09-11T19:46:06.374Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21d6c5957f5ca97d7352e60f55ea412beb9419f5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/63e18fc65587fd3f7b4c6d70e96d32fc41d82ba3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ac469a274e3c7d87fc46ba46d83b95009680407"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8eeca993357a0bc35aaefebfd7462ac7b0a21d9a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a631a26a8777bb235eabd478bbbaf26a4db750bf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/be3a5c1d857b0dcbc11796cea603ef25834f75b2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bfeac42d9074e539bacd1898dd8c14b7f5776620"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c7270f62e7a05a2ee68aa2b74262b658a14463bd"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89684.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89684"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "nfsd: fix cpntf publish race in nfs4_init_cp_state"
}