{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8af1c6fbd9239877998c7f5a591cb2c88d41fb66"
            },
            {
              "fixed": "c098ff857e7ca923539164af5b3c2fe3e8f8afaf"
            },
            {
              "fixed": "58f3a14826d4e6b0d5421f1a64be280b48601ea2"
            },
            {
              "fixed": "ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb"
            },
            {
              "fixed": "6cea34d7ec6829b62f521a37a287f670144a2233"
            },
            {
              "fixed": "b7eef00f08b92b0b9efe8ae0df6d0005e6199323"
            },
            {
              "fixed": "68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4"
            },
            {
              "fixed": "ceacaa76f221a6577aba945bb8873c2e640aeba4"
            },
            {
              "fixed": "9862ef9ab0a116c6dca98842aab7de13a252ae02"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "6c717726f341fd8f39a3ec2dcf5d98d9d28a2769"
            },
            {
              "last_affected": "d2997d64dfa65082236bca1efd596b6c935daf5e"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.4.24"
            },
            {
              "fixed": "5.5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.5.8"
            },
            {
              "fixed": "5.6"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.6.0"
            },
            {
              "fixed": "5.10.253"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.203"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.168"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.134"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.81"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.22"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31418.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ipset: drop logically empty buckets in mtype_del\n\nmtype_del() counts empty slots below n-\u003epos in k, but it only drops the\nbucket when both n-\u003epos and k are zero. This misses buckets whose live\nentries have all been removed while n-\u003epos still points past deleted slots.\n\nTreat a bucket as empty when all positions below n-\u003epos are unused and\nrelease it directly instead of shrinking it further.",
  "id": "CVE-2026-31418",
  "modified": "2026-07-08T05:39:14.617772797Z",
  "published": "2026-04-13T13:21:05.316Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/58f3a14826d4e6b0d5421f1a64be280b48601ea2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6cea34d7ec6829b62f521a37a287f670144a2233"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9862ef9ab0a116c6dca98842aab7de13a252ae02"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b7eef00f08b92b0b9efe8ae0df6d0005e6199323"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c098ff857e7ca923539164af5b3c2fe3e8f8afaf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ceacaa76f221a6577aba945bb8873c2e640aeba4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31418.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31418"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "netfilter: ipset: drop logically empty buckets in mtype_del"
}