{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "98b995660bff011d8e00af03abd74ac7d1ac1390"
            },
            {
              "fixed": "f13fe6794726755a43090cb680c4c58cea6aa5f1"
            },
            {
              "fixed": "c28d945bfa92e15147e93b73f95345b9bec979b0"
            },
            {
              "fixed": "25966fc097691e5c925ad080f64a2f19c5fd940a"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.16.0"
            },
            {
              "fixed": "6.18.20"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43364.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nublk: fix NULL pointer dereference in ublk_ctrl_set_size()\n\nublk_ctrl_set_size() unconditionally dereferences ub-\u003eub_disk via\nset_capacity_and_notify() without checking if it is NULL.\n\nub-\u003eub_disk is NULL before UBLK_CMD_START_DEV completes (it is only\nassigned in ublk_ctrl_start_dev()) and after UBLK_CMD_STOP_DEV runs\n(ublk_detach_disk() sets it to NULL). Since the UBLK_CMD_UPDATE_SIZE\nhandler performs no state validation, a user can trigger a NULL pointer\ndereference by sending UPDATE_SIZE to a device that has been added but\nnot yet started, or one that has been stopped.\n\nFix this by checking ub-\u003eub_disk under ub-\u003emutex before dereferencing\nit, and returning -ENODEV if the disk is not available.",
  "id": "CVE-2026-43364",
  "modified": "2026-07-08T05:35:56.720679910Z",
  "published": "2026-05-08T14:21:17.654Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/25966fc097691e5c925ad080f64a2f19c5fd940a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c28d945bfa92e15147e93b73f95345b9bec979b0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f13fe6794726755a43090cb680c4c58cea6aa5f1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43364.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43364"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "ublk: fix NULL pointer dereference in ublk_ctrl_set_size()"
}