{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "4b623f9f0f59652ea71fcb27d60b4c3b65126dbb"
            },
            {
              "fixed": "581eee0890a8bde44f1fb78ad3e70502a897d583"
            },
            {
              "fixed": "348758ba74e6a348299965b16a97cfb817545cc0"
            },
            {
              "fixed": "0f9ea7141f365b4f27226898e62220fb98ef8dc6"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.20"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23437.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: shaper: protect late read accesses to the hierarchy\n\nWe look up a netdev during prep of Netlink ops (pre- callbacks)\nand take a ref to it. Then later in the body of the callback\nwe take its lock or RCU which are the actual protections.\n\nThis is not proper, a conversion from a ref to a locked netdev\nmust include a liveness check (a check if the netdev hasn't been\nunregistered already). Fix the read cases (those under RCU).\nWrites needs a separate change to protect from creating the\nhierarchy after flush has already run.",
  "id": "CVE-2026-23437",
  "modified": "2026-07-15T01:49:20.110342823Z",
  "published": "2026-04-03T15:15:22.048Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f9ea7141f365b4f27226898e62220fb98ef8dc6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/348758ba74e6a348299965b16a97cfb817545cc0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/581eee0890a8bde44f1fb78ad3e70502a897d583"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23437.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23437"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "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": "net: shaper: protect late read accesses to the hierarchy"
}