{"api_version":"1","generated_at":"2026-08-22T21:53:16+00:00","cve":"CVE-2026-74670","urls":{"html":"https://cve.report/CVE-2026-74670","api":"https://cve.report/api/cve/CVE-2026-74670.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74670","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74670"},"summary":{"title":"ipvs: stop estimator after disabled calc phase","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-22 16:16:40","updated_at":"2026-08-22 16:16:40"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/558f67f1340f803a346ecd14a69c49653111c5f4","name":"https://git.kernel.org/stable/c/558f67f1340f803a346ecd14a69c49653111c5f4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e7f34f29b330265d456943bf0b984dcecfcef9af","name":"https://git.kernel.org/stable/c/e7f34f29b330265d456943bf0b984dcecfcef9af","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d5122a2b2601145975d387006e517c56896e310e","name":"https://git.kernel.org/stable/c/d5122a2b2601145975d387006e517c56896e310e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2335dedc1922dfa889ca1f9f70370924e8e79a08","name":"https://git.kernel.org/stable/c/2335dedc1922dfa889ca1f9f70370924e8e79a08","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/de98dc5ef94b83bbb444c670c253ea02ca0f5e43","name":"https://git.kernel.org/stable/c/de98dc5ef94b83bbb444c670c253ea02ca0f5e43","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74670","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74670","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 705dd34440812735ece298eb5bc153fde9544d42 d5122a2b2601145975d387006e517c56896e310e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 705dd34440812735ece298eb5bc153fde9544d42 de98dc5ef94b83bbb444c670c253ea02ca0f5e43 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 705dd34440812735ece298eb5bc153fde9544d42 e7f34f29b330265d456943bf0b984dcecfcef9af git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 705dd34440812735ece298eb5bc153fde9544d42 2335dedc1922dfa889ca1f9f70370924e8e79a08 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 705dd34440812735ece298eb5bc153fde9544d42 558f67f1340f803a346ecd14a69c49653111c5f4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.2","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.152 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.104 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.45 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.9 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/netfilter/ipvs/ip_vs_est.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"d5122a2b2601145975d387006e517c56896e310e","status":"affected","version":"705dd34440812735ece298eb5bc153fde9544d42","versionType":"git"},{"lessThan":"de98dc5ef94b83bbb444c670c253ea02ca0f5e43","status":"affected","version":"705dd34440812735ece298eb5bc153fde9544d42","versionType":"git"},{"lessThan":"e7f34f29b330265d456943bf0b984dcecfcef9af","status":"affected","version":"705dd34440812735ece298eb5bc153fde9544d42","versionType":"git"},{"lessThan":"2335dedc1922dfa889ca1f9f70370924e8e79a08","status":"affected","version":"705dd34440812735ece298eb5bc153fde9544d42","versionType":"git"},{"lessThan":"558f67f1340f803a346ecd14a69c49653111c5f4","status":"affected","version":"705dd34440812735ece298eb5bc153fde9544d42","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/netfilter/ipvs/ip_vs_est.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.2"},{"lessThan":"6.2","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.152","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.104","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.45","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.152","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.104","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.45","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.9","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"6.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-08-22T15:32:40.850Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/d5122a2b2601145975d387006e517c56896e310e"},{"url":"https://git.kernel.org/stable/c/de98dc5ef94b83bbb444c670c253ea02ca0f5e43"},{"url":"https://git.kernel.org/stable/c/e7f34f29b330265d456943bf0b984dcecfcef9af"},{"url":"https://git.kernel.org/stable/c/2335dedc1922dfa889ca1f9f70370924e8e79a08"},{"url":"https://git.kernel.org/stable/c/558f67f1340f803a346ecd14a69c49653111c5f4"}],"title":"ipvs: stop estimator after disabled calc phase","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74670","datePublished":"2026-08-22T15:32:40.850Z","dateReserved":"2026-08-15T05:44:03.925Z","dateUpdated":"2026-08-22T15:32:40.850Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-22 16:16:40","lastModifiedDate":"2026-08-22 16:16:40","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74670","Ordinal":"1","Title":"ipvs: stop estimator after disabled calc phase","CVE":"CVE-2026-74670","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74670","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"ipvs: stop estimator after disabled calc phase"}]}}}