CVE-2026-90337serial: core: do fallible allocations before the console can be registered

Official description

In the Linux kernel, the following vulnerability has been resolved: serial: core: do fallible allocations before the console can be registered serial_core_add_one_port() allocates uport->tty_groups after uart_configure_port(), which may register the console. If the allocation fails, the driver unwinds the port while its console remains registered. The earlier uport->name allocation has a related failure path that leaves state->uart_port linked to a port being freed. Failslab reproduced a NULL dereference in PL011 console output and a KASAN use-after-free in i.MX console output after failed binds. Allocate the name and tty_groups before linking the port and configuring it. Reserve space for the optional driver attribute group because config_port() may populate uport->attr_group during configuration.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/be61f56c4f0ed1cbf16c5f7b0dec6d6414993dd4
• https://git.kernel.org/stable/c/e2ddbfd826836cba1b7a25ee4eb512f7d752b703
• https://git.kernel.org/stable/c/8c7c75bfa7b84d6999de2100ce9c09e3779249a0
• https://git.kernel.org/stable/c/9260a92ce90e6a95ce2ffdf1441c5216bf3f9552
• https://git.kernel.org/stable/c/c2aec15f78b2e6ccd9b94216a901248511355982
• https://git.kernel.org/stable/c/1a0e4fbce5d9c1bc179a35a2fd9ed142664299e3