CVE-2026-98883: serial: 8250_port: recognize UPIO_AU

Unscored severity · published Oct 23, 2026

CVE-2026-98883

serial: 8250_port: recognize UPIO_AU

New

–

CVSS

0.2%

EPSS

On KEV

Description

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.

Exploitation

Is it being used?

Exploit prediction (EPSS)0.2% · higher than 5% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Linux · Linux

7c7e6c8924e7bf98db4e5b2edb202842003c00c2 before 9f67997353caa29c6a080789a1fb6e01fb50c118; 7c7e6c8924e7bf98db4e5b2edb202842003c00c2 before 49fa670efdfdd27e29145cbd2beef065c08717ef; 6.13 · source: vendor

Affected product

Linux

All Linux CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-98883

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-98883

git.kernel.org

https://git.kernel.org/stable/c/49fa670efdfdd27e29145cbd2beef065c08717ef

git.kernel.org

https://git.kernel.org/stable/c/9f67997353caa29c6a080789a1fb6e01fb50c118