CVE-2026-53384

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxcc816969d7b5973d2720d9afd381f06f0eac6885 < ccdf4510a3873b14e5e348cdb038717996f09fdaaffected
LinuxLinuxcc816969d7b5973d2720d9afd381f06f0eac6885 < 511d2b92f8d20de04acafab676150d26fb5c67f4affected
LinuxLinuxcc816969d7b5973d2720d9afd381f06f0eac6885 < 07ffe414a708ae60551401cec5d727ed156b8cafaffected
LinuxLinuxcc816969d7b5973d2720d9afd381f06f0eac6885 < 3d205fe80f2181f0109150ad1fa06ee5bc046935affected
LinuxLinuxcc816969d7b5973d2720d9afd381f06f0eac6885 < d72650a4f334581b23a1892b888a4cb1be142f76affected
LinuxLinuxcc816969d7b5973d2720d9afd381f06f0eac6885 < 778b9dda4b24005a27bcd9c35c110bf8d7f259caaffected
LinuxLinuxcc816969d7b5973d2720d9afd381f06f0eac6885 < 10fc708b4de7f86002d2d735a2dbf3b5b7f65692affected
LinuxLinux5.9affected
LinuxLinux0 < 5.9unaffected
LinuxLinux6.1.177 <= 6.1.*unaffected
LinuxLinux6.6.144 <= 6.6.*unaffected
LinuxLinux6.12.95 <= 6.12.*unaffected
LinuxLinux6.18.38 <= 6.18.*unaffected
LinuxLinux7.0.14 <= 7.0.*unaffected
LinuxLinux7.1.2 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References