Critical 9.8Published Jul 19, 2026

CVE-2026-53384serial: 8250_dw: unregister 8250 port if clk_notifier_register() fails

Updated under an hour ago (Oct 26, 2026, 7:10 PM ET)

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Exploited in the last 30 days

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: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 57f83e5dd6a33c4696699954784f8fee789b1d0c before ccdf4510a3873b14e5e348cdb038717996f09fda; from 57f83e5dd6a33c4696699954784f8fee789b1d0c before 511d2b92f8d20de04acafab676150d26fb5c67f4; 57f83e5dd6a33c4696699954784f8fee789b1d0c builds before 07ffe414a708ae60551401cec5d727ed156b8caf; 57f83e5dd6a33c4696699954784f8fee789b1d0c builds before 3d205fe80f2181f0109150ad1fa06ee5bc046935; from 57f83e5dd6a33c4696699954784f8fee789b1d0c before d72650a4f334581b23a1892b888a4cb1be142f76; from 57f83e5dd6a33c4696699954784f8fee789b1d0c before 778b9dda4b24005a27bcd9c35c110bf8d7f259ca; 57f83e5dd6a33c4696699954784f8fee789b1d0c builds before 10fc708b4de7f86002d2d735a2dbf3b5b7f65692	CNA record
linux linux_kernel linux:linux_kernel	from 5.19 before 6.1.177; from 6.2 before 6.6.144; from 6.7 before 6.12.95; from 6.13 before 6.18.38; from 6.19 before 7.0.14; from 7.1 before 7.1.2	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.