{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80923",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-80923"
  ],
  "published": "2026-09-09T16:19:47Z",
  "summary": "xhci: dbgtty: Fix unregister on tty_register_driver() failure",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxhci: dbgtty: Fix unregister on tty_register_driver() failure\n\nIf tty_register_driver() fails, it drops the reference, but fails to set\nthe global dbc_tty_driver to NULL, causing the unregister to be called\nagain when module exits.\n\nOn module unload dbc_tty_exit() only gates its cleanup on the driver\npointer being non-NULL, so it operates on the already-freed driver:\n\n    module_init(xhci_hcd_init)\n      xhci_hcd_init()\n        xhci_dbc_init()                       [return value ignored]\n          dbc_tty_init()\n            tty_register_driver() fails\n              tty_driver_kref_put()           -> driver freed\n              (dbc_tty_driver left dangling)\n    ...\n    module_exit(xhci_hcd_fini)\n      xhci_hcd_fini()\n        xhci_dbc_exit()\n          dbc_tty_exit()\n            if (dbc_tty_driver)               -> true (dangling)\n              tty_unregister_driver()         -> use-after-free",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.187",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80923"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/01b7bc0938061f2fd46e0094f6483d8c6c02f7d3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/43635ff6401ca0e0ed21875379eeded921321525"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eaca2814f32b9872a332326324b9e83e01f156d2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/943f976c93e70563b132f5585ff68b08c89641a2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/33ed35ca629477f57e0dd1d77d6df96cf5a9eb55"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0e469b94fbba8eb03666da41dd1082b793c50c1a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a916fa66a43e10f63198b6ce978badffc678821a"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-09T16:19:47Z"
  }
}