GHSA-8QR8-6QVC-C8X9

Vulnerability from github – Published: 2026-07-19 12:30 – Updated: 2026-07-20 15:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

serial: 8250_dw: unregister 8250 port if clk_notifier_register() fails

dw8250_probe() registers the 8250 port via serial8250_register_8250_port() and then, if the device has a clock, registers a clock notifier. If clk_notifier_register() fails, probe returns the error but leaves the 8250 port registered. The matching serial8250_unregister_port() lives in dw8250_remove(), which is not called when probe fails, so the port slot stays occupied until the device is rebound or the system is rebooted. The devm-allocated driver data is freed while the port still references it (via the saved private_data and serial_in/serial_out callbacks), so any access to that port slot before a rebind is a use-after-free hazard.

Unregister the port on the clk_notifier_register() error path.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-53384"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T12:16:49Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250_dw: unregister 8250 port if clk_notifier_register() fails\n\ndw8250_probe() registers the 8250 port via serial8250_register_8250_port()\nand then, if the device has a clock, registers a clock notifier. If\nclk_notifier_register() fails, probe returns the error but leaves the\n8250 port registered. The matching serial8250_unregister_port() lives\nin dw8250_remove(), which is not called when probe fails, so the port\nslot stays occupied until the device is rebound or the system is\nrebooted. The devm-allocated driver data is freed while the port still\nreferences it (via the saved private_data and serial_in/serial_out\ncallbacks), so any access to that port slot before a rebind is a\nuse-after-free hazard.\n\nUnregister the port on the clk_notifier_register() error path.",
  "id": "GHSA-8qr8-6qvc-c8x9",
  "modified": "2026-07-20T15:31:44Z",
  "published": "2026-07-19T12:30:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53384"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07ffe414a708ae60551401cec5d727ed156b8caf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/10fc708b4de7f86002d2d735a2dbf3b5b7f65692"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d205fe80f2181f0109150ad1fa06ee5bc046935"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/511d2b92f8d20de04acafab676150d26fb5c67f4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/778b9dda4b24005a27bcd9c35c110bf8d7f259ca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ccdf4510a3873b14e5e348cdb038717996f09fda"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d72650a4f334581b23a1892b888a4cb1be142f76"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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