Live › vulnerability › CVE-2026-98883
Go to dashboardThe Linux kernel 8250 serial driver did not recognize the UPIO_AU port type used on MIPS Alchemy systems, so it printed a kernel warning during probe. The fix makes the driver accept that type and skip the step, which only affects boot logs on those boards.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Only MIPS Alchemy systems (such as Au1300 boards) that load the 8250 serial driver are described by the sources; the sources do not describe a security impact beyond a warning message. unknown for anyone else.
No product ranges from the sources yet.
Unknown from the sources.
Unknown from the sources.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
In the Linux kernel, the following vulnerability has been resolved:
serial: 8250_port: recognize UPIO_AU
My MIPS Alchemy systems generate the following warning during probe of the 8250 driver:
WARNING: drivers/tty/serial/8250/8250_port.c:462 at set_io_from_upio+0xfc/0x124, CPU#0: swapper/0/1 Unsupported UART type 4 [...] [<80521d40>] set_io_from_upio+0xfc/0x124 [<80521dfc>] serial8250_set_defaults+0x94/0xe0 [<80520fb4>] serial8250_register_8250_port+0x288/0x51c [<805214ec>] serial8250_probe+0x160/0x1e8 [<8053b5f0>] platform_probe+0x64/0x90
The least invasive fix is to recognize UPIO_AU (type 4) in set_io_from_upio() and do nothing, since all parameters have already been set up in 8250_rt288x.c::au_platform_setup().
Run-tested on Alchemy Au1300 platform.
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