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.
| Vendor | Product | Versions |
|---|---|---|
| linux | linux_kernel | 57f83e5dd6a33c4696699954784f8fee789b1d0c, 57f83e5dd6a33c4696699954784f8fee789b1d0c, 57f83e5dd6a33c4696699954784f8fee789b1d0c, 57f83e5dd6a33c4696699954784f8fee789b1d0c, 57f83e5dd6a33c4696699954784f8fee789b1d0c, 57f83e5dd6a33c4696699954784f8fee789b1d0c, 57f83e5dd6a33c4696699954784f8fee789b1d0c, 5.19 |
Downstream vendors/products affected by this vulnerability
| Vendor | Product | Source | Confidence |
|---|---|---|---|
| open source | open source linux kernel | cert_advisory | 90% |
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Updated severity from NONE to CRITICAL and assigned CVSS estimate of 9.0 based on article's 'very critical' classification.
Initial creation
