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CVE-2026-53384

Full vulnerability record from the local CVENow database.

Description

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
CRITICAL
CVSS score
9.8 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-07-19 12:16:49.263000
Last modified
2026-10-19 20:19:17.470000
View original CVE JSON 
{
  "id": "CVE-2026-53384",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-07-19T12:16:49.263",
  "lastModified": "2026-10-19T20:19:17.470",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "affected": [
    {
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      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/tty/serial/8250/8250_dw.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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        {
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          "defaultStatus": "affected",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
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            },
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              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
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              "versionType": "semver",
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              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
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              "status": "unaffected"
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            },
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              "version": "7.2",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
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    }
  ],
  "metrics": {
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        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-16T15:29:55.097049Z",
          "id": "CVE-2026-53384",
          "options": [
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              "exploitation": "none"
            },
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            },
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          "role": "CISA Coordinator",
          "version": "2.0.3"
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  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
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          "value": "CWE-416"
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      "type": "Secondary",
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  ],
  "configurations": [
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      "nodes": [
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          "negate": false,
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}