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CVE-2026-53384

CRITICALCVSS 9.8/10EPSS 0.49%

Last modified

CVE-2026-53384 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.49% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.8/10

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

EPSS Probability
0.49%

39.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 57f83e5dd6a33c4696699954784f8fee789b1d0c, < ccdf4510a3873b14e5e348cdb038717996f09fda; >= 57f83e5dd6a33c4696699954784f8fee789b1d0c, < 511d2b92f8d20de04acafab676150d26fb5c67f4; >= 57f83e5dd6a33c4696699954784f8fee789b1d0c, < 07ffe414a708ae60551401cec5d727ed156b8caf; >= 57f83e5dd6a33c4696699954784f8fee789b1d0c, < 3d205fe80f2181f0109150ad1fa06ee5bc046935; >= 57f83e5dd6a33c4696699954784f8fee789b1d0c, < d72650a4f334581b23a1892b888a4cb1be142f76; >= 57f83e5dd6a33c4696699954784f8fee789b1d0c, < 778b9dda4b24005a27bcd9c35c110bf8d7f259ca; >= 57f83e5dd6a33c4696699954784f8fee789b1d0c, < 10fc708b4de7f86002d2d735a2dbf3b5b7f65692
LinuxLinux5.19

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-53384?
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.
How severe is CVE-2026-53384?
CVE-2026-53384 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.49% probability of exploitation in the next 30 days.
How do I fix CVE-2026-53384?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST