{"id":"CVE-2026-89684","revision":"ffdd4f9a521346248ccbbd54e8826f8c","records":[{"revision":"ffdd4f9a521346248ccbbd54e8826f8c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89684","aliases":[],"title":"nfsd: fix cpntf publish race in nfs4_init_cp_state","description":"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.","state":0,"publishedAt":"2026-09-11T19:46:06.374+00:00","modifiedAt":"2026-10-19T08:50:57.622+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/nfsd/nfs4state.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"624322f1adc58acd0b69f77a6ddc764207e97241\",\n                            \"lessThan\": \"63e18fc65587fd3f7b4c6d70e96d32fc41d82ba3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"624322f1adc58acd0b69f77a6ddc764207e97241\",\n                            \"lessThan\": \"6ac469a274e3c7d87fc46ba46d83b95009680407\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"624322f1adc58acd0b69f77a6ddc764207e97241\",\n                            \"lessThan\": \"8eeca993357a0bc35aaefebfd7462ac7b0a21d9a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"624322f1adc58acd0b69f77a6ddc764207e97241\",\n                            \"lessThan\": \"bfeac42d9074e539bacd1898dd8c14b7f5776620\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"624322f1adc58acd0b69f77a6ddc764207e97241\",\n                            \"lessThan\": \"21d6c5957f5ca97d7352e60f55ea412beb9419f5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"624322f1adc58acd0b69f77a6ddc764207e97241\",\n                            \"lessThan\": \"a631a26a8777bb235eabd478bbbaf26a4db750bf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"624322f1adc58acd0b69f77a6ddc764207e97241\",\n                            \"lessThan\": \"c7270f62e7a05a2ee68aa2b74262b658a14463bd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"624322f1adc58acd0b69f77a6ddc764207e97241\",\n                            \"lessThan\": \"be3a5c1d857b0dcbc11796cea603ef25834f75b2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/nfsd/nfs4state.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.6\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/63e18fc65587fd3f7b4c6d70e96d32fc41d82ba3","https://git.kernel.org/stable/c/6ac469a274e3c7d87fc46ba46d83b95009680407","https://git.kernel.org/stable/c/8eeca993357a0bc35aaefebfd7462ac7b0a21d9a","https://git.kernel.org/stable/c/bfeac42d9074e539bacd1898dd8c14b7f5776620","https://git.kernel.org/stable/c/21d6c5957f5ca97d7352e60f55ea412beb9419f5","https://git.kernel.org/stable/c/a631a26a8777bb235eabd478bbbaf26a4db750bf","https://git.kernel.org/stable/c/c7270f62e7a05a2ee68aa2b74262b658a14463bd","https://git.kernel.org/stable/c/be3a5c1d857b0dcbc11796cea603ef25834f75b2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89684","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89684","identifiers":["CVE-2026-89684"]},"retained":false,"historicalAffected":[]}],"coverage":[]}