ipvs: stop estimator after disabled calc phase

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Summary

CVECVE-2026-74670
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:40 UTC
Updated2026-08-22 16:16:40 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ipvs: stop estimator after disabled calc phase IPVS estimator kthread 0 starts with zeroed chain and tick limits until its initial calculation phase completes. If network namespace teardown clears ipvs->enable during that phase, ip_vs_est_calc_phase() can return without installing positive limits. The kthread can then continue into its main loop and drain est_temp_list with zero chain_max, tick_max and est_max_count values. Each enqueue consumes one available tick row, but est_count never reaches the zero est_max_count value. After all rows are consumed, the row lookup returns IPVS_EST_NTICKS and ip_vs_enqueue_estimator() writes past the ticks and tick_len arrays. Exit kthread 0 after the calculation phase if the kthread is stopping or IPVS has been disabled. That keeps temporary estimators from being drained after the limits failed to initialize. Estimator kthreads can now self-exit before teardown or reload stops kd->task. Keep an extra task reference after creation and release it with kthread_stop_put(), so kd->task remains valid until the stop paths consume that reference.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 705dd34440812735ece298eb5bc153fde9544d42 d5122a2b2601145975d387006e517c56896e310e git Not specified
CNA Linux Linux affected 705dd34440812735ece298eb5bc153fde9544d42 de98dc5ef94b83bbb444c670c253ea02ca0f5e43 git Not specified
CNA Linux Linux affected 705dd34440812735ece298eb5bc153fde9544d42 e7f34f29b330265d456943bf0b984dcecfcef9af git Not specified
CNA Linux Linux affected 705dd34440812735ece298eb5bc153fde9544d42 2335dedc1922dfa889ca1f9f70370924e8e79a08 git Not specified
CNA Linux Linux affected 705dd34440812735ece298eb5bc153fde9544d42 558f67f1340f803a346ecd14a69c49653111c5f4 git Not specified
CNA Linux Linux affected 6.2 Not specified
CNA Linux Linux unaffected 6.2 semver Not specified
CNA Linux Linux unaffected 6.6.152 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.104 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/558f67f1340f803a346ecd14a69c49653111c5f4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e7f34f29b330265d456943bf0b984dcecfcef9af 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d5122a2b2601145975d387006e517c56896e310e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2335dedc1922dfa889ca1f9f70370924e8e79a08 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/de98dc5ef94b83bbb444c670c253ea02ca0f5e43 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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