{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"
            },
            {
              "fixed": "5cbab666721d974bfe033a12045d808936deaefd"
            },
            {
              "fixed": "941c9f84c9b6310f7aaa1c8c785dcc634ee33050"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.18.53"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.18.53"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97480.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: serial: 8250: protect against NULL uart-\u003eport.dev in register\n\nserial8250_register_8250_port() conditionally copies uart-\u003eport.dev\nfrom up-\u003eport.dev only when up-\u003eport.dev is non-NULL:\n\n\tif (up-\u003eport.dev) {\n\t\tuart-\u003eport.dev = up-\u003eport.dev;\n\t\t...\n\t}\n\nSo if both the existing uart slot and up have a NULL -\u003edev,\nuart-\u003eport.dev remains NULL. The very next ACPI companion check\nthen dereferences it unconditionally:\n\n\tif (!has_acpi_companion(uart-\u003eport.dev)) {\n\nhas_acpi_companion() reads dev-\u003efwnode without a NULL guard\n(include/linux/acpi.h), so this NULL-derefs the kernel for the\nremaining no-dev case rather than just skipping the\nmctrl_gpio_init() initialisation as intended.\n\nsmatch flags the inconsistency:\n\n  drivers/tty/serial/8250/8250_core.c:767\n  serial8250_register_8250_port() error: 'uart-\u003eport.dev' could be\n  null (see line 719)\n\nGuard the call with a NULL check so register continues to work\nfor callers that legitimately have no parent device (legacy\nnon-OF/non-ACPI registrations).\n\nNo functional change for callers that pass a non-NULL -\u003edev.",
  "id": "CVE-2026-97480",
  "modified": "2026-09-26T03:30:55.963905974Z",
  "published": "2026-09-24T16:04:22.893Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5cbab666721d974bfe033a12045d808936deaefd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/941c9f84c9b6310f7aaa1c8c785dcc634ee33050"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97480.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97480"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "tty: serial: 8250: protect against NULL uart-\u003eport.dev in register"
}