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Vulnerability record · CVE-2026-53384 · published 19 July 2026

CVE-2026-53384: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

9.8 CVSS 3.1 Critical EPSS 0.52% · top 58.5% CWE-416 · Use after free
9.8CVSS 3.1 base score
0.52%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
17 Aug 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/07ffe414a708ae60551401cec5d727ed156b8caf Patch
https://git.kernel.org/stable/c/10fc708b4de7f86002d2d735a2dbf3b5b7f65692 Patch
https://git.kernel.org/stable/c/3d205fe80f2181f0109150ad1fa06ee5bc046935 Patch
https://git.kernel.org/stable/c/511d2b92f8d20de04acafab676150d26fb5c67f4 Patch
https://git.kernel.org/stable/c/778b9dda4b24005a27bcd9c35c110bf8d7f259ca Patch
https://git.kernel.org/stable/c/ccdf4510a3873b14e5e348cdb038717996f09fda Patch
https://git.kernel.org/stable/c/d72650a4f334581b23a1892b888a4cb1be142f76 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-53384), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.