{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74670",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74670"
  ],
  "published": "2026-08-22T15:32:12Z",
  "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74670"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d5122a2b2601145975d387006e517c56896e310e"
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      "url": "https://git.kernel.org/stable/c/de98dc5ef94b83bbb444c670c253ea02ca0f5e43"
    },
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      "url": "https://git.kernel.org/stable/c/e7f34f29b330265d456943bf0b984dcecfcef9af"
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    },
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-25T05:42:41Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires local IPVS configuration via netlink or setsockopt (GENL_ADMIN_PERM/CAP_NET_ADMIN); the bug is in estimator kthread management during namespace teardown, not in remote packet handling.\nAC:L - The attacker controls both sides of the race by creating a network namespace, adding many IPVS services to populate est_temp_list, and tearing down the namespace during kthread 0's calc phase.\nPR:L - Triggering IPVS service creation and namespace teardown requires CAP_NET_ADMIN, which unprivileged users can obtain in user+network namespaces via unshare on systems with unprivileged user namespaces enabled.\nUI:N - No victim interaction is required; an attacker can script IPVS service creation and namespace destruction without any action from another user or administrator.\nS:U - The out-of-bounds write corrupts kernel heap memory within the same kernel security boundary; impact is local privilege escalation or denial of service, not a cross-boundary escape.\nC:H - Out-of-bounds writes past ticks[] and tick_len[] corrupt adjacent heap metadata and kernel structures, providing a memory corruption primitive that can be leveraged for arbitrary kernel memory disclosure.\nI:H - Writing past the fixed-size ticks[] and tick_len[] arrays enables heap corruption that can overwrite function pointers or adjacent objects, supporting arbitrary kernel write and potential code execution.\nA:H - Heap corruption from unbounded index writes in ip_vs_enqueue_estimator() can cause kernel oops, panic, or hang when processing estimators after failed calc-phase initialization."
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}