{"id":"CVE-2026-74670","aliases":[],"url":"https://o3.security/vulnerability/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->enable 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->task. Keep an extra task reference after creation and release it\nwith kthread_stop_put(), so kd->task remains valid until the stop paths\nconsume that reference.","published":"2026-08-22T15:32:40.850Z","modified":"2026-08-24T11:47:20.416250293Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.6.152"}],"fix":null,"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-24T11:47:20.416250293Z"}}