{"id":"CVE-2026-89669","summary":"nfsd: initialize copy-notify stateid before publishing it","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: initialize copy-notify stateid before publishing it\n\nnfsd4_copy_notify() finished initializing the cpntf state after\nnfs4_alloc_init_cpntf_state() had already linked it into the\ns2s_cp_stateids IDR and the parent's sc_cp_list, with cs_count == 1 (the\nmembership reference) and none held for the caller. A racing\nOFFLOAD_CANCEL (crafted cl_id == nn-\u003es2s_cp_cl_id plus the guessable\nso_id) could reach manage_cpntf_state() and free the entry, turning the\ncaller's subsequent cpn_cnr_stateid read and cp_p_stateid/cp_p_clid\nwrites into use-after-free. The owning clientid was also only recorded\nafter publication, so it could not gate an ownership check in that window.\n\nRecord cp_p_stateid and cp_p_clid inside nfs4_alloc_init_cpntf_state()\nbefore nfs4_init_cp_state() publishes the entry, and return it with an\nextra reference. The caller reads the stateid under that reference and\ndrops it with nfs4_put_cpntf_state(); on a late error the laundromat\nreaps the entry.","modified":"2026-09-13T03:47:20.151405854Z","published":"2026-09-11T19:45:55.111Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89669.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/129643893b79f8a3c6b72045f933fbab5ee424ca"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a4d7fedcaaf33e60a01e53eafca9041ef966212f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e08a3dcaca0505f861e344a387f37f94d95dbdc2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89669.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89669"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"624322f1adc58acd0b69f77a6ddc764207e97241"},{"fixed":"e08a3dcaca0505f861e344a387f37f94d95dbdc2"},{"fixed":"a4d7fedcaaf33e60a01e53eafca9041ef966212f"},{"fixed":"4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b"},{"fixed":"129643893b79f8a3c6b72045f933fbab5ee424ca"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89669.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.6.0"},{"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"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89669.json"}}],"schema_version":"1.9.0"}