{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "705dd34440812735ece298eb5bc153fde9544d42"
            },
            {
              "fixed": "d5122a2b2601145975d387006e517c56896e310e"
            },
            {
              "fixed": "de98dc5ef94b83bbb444c670c253ea02ca0f5e43"
            },
            {
              "fixed": "e7f34f29b330265d456943bf0b984dcecfcef9af"
            },
            {
              "fixed": "2335dedc1922dfa889ca1f9f70370924e8e79a08"
            },
            {
              "fixed": "558f67f1340f803a346ecd14a69c49653111c5f4"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "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"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74670.json"
  },
  "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.",
  "id": "CVE-2026-74670",
  "modified": "2026-08-27T11:31:16.051775342Z",
  "published": "2026-08-22T15:32:40.850Z",
  "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"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ipvs: stop estimator after disabled calc phase"
}