{"id":"CVE-2026-74670","summary":"ipvs: stop estimator after disabled calc phase","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: stop estimator after disabled calc phase\n\nIPVS estimator kthread 0 starts with zeroed chain and tick limits until\nits initial calculation phase completes. If network namespace teardown\nclears ipvs-\u003eenable during that phase, ip_vs_est_calc_phase() can return\nwithout installing positive limits.\n\nThe kthread can then continue into its main loop and drain\nest_temp_list with zero chain_max, tick_max and est_max_count values.\nEach enqueue consumes one available tick row, but est_count never\nreaches the zero est_max_count value. After all rows are consumed, the\nrow lookup returns IPVS_EST_NTICKS and ip_vs_enqueue_estimator() writes\npast the ticks and tick_len arrays.\n\nExit kthread 0 after the calculation phase if the kthread is stopping or\nIPVS has been disabled. That keeps temporary estimators from being\ndrained after the limits failed to initialize.\n\nEstimator kthreads can now self-exit before teardown or reload stops\nkd-\u003etask. Keep an extra task reference after creation and release it\nwith kthread_stop_put(), so kd-\u003etask remains valid until the stop paths\nconsume that reference.","modified":"2026-08-26T03:49:55.080639489Z","published":"2026-08-22T15:32:40.850Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74670.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2335dedc1922dfa889ca1f9f70370924e8e79a08"},{"type":"WEB","url":"https://git.kernel.org/stable/c/558f67f1340f803a346ecd14a69c49653111c5f4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d5122a2b2601145975d387006e517c56896e310e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/de98dc5ef94b83bbb444c670c253ea02ca0f5e43"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e7f34f29b330265d456943bf0b984dcecfcef9af"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74670.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74670"},{"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":"705dd34440812735ece298eb5bc153fde9544d42"},{"fixed":"d5122a2b2601145975d387006e517c56896e310e"},{"fixed":"de98dc5ef94b83bbb444c670c253ea02ca0f5e43"},{"fixed":"e7f34f29b330265d456943bf0b984dcecfcef9af"},{"fixed":"2335dedc1922dfa889ca1f9f70370924e8e79a08"},{"fixed":"558f67f1340f803a346ecd14a69c49653111c5f4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-74670.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.152"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.104"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.45"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-74670.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}