CVE-2026-98883None▾ Sunlit

serial: 8250_port: recognize UPIO_AU

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_por…

▾ Sunlit zone — Low / medium · no exploitation signal

Depth score3/ 100 · Minimal

impact 2.8 · likelihood 0 · exploitation 0

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Proof of concept

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Published

Oct 23, 2026

Updated

Oct 26, 2026

CVSS

—

Vendor

Linux

Product

Linux

CWE

—

Depth score

3 · Minimal

EPSS

0.16% · p5

Platforms

—

Source

CVEORG

Vector

—

EPSS history

Exploit-prediction probability, daily snapshots since Oct 25.

0.2% → 0.2%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

3 events · 3 days

Oct 23, 2026Published
Disclosed via CVEORG
Oct 25, 2026EPSS first tracked
0.2%
Oct 26, 2026Record revised
Last analysed / modified upstream

Linux #cve.org

Affected

Linux >= 7c7e6c8924e7bf98db4e5b2edb202842003c00c2 < 9f67997353caa29c6a080789a1fb6e01fb50c118
Linux >= 7c7e6c8924e7bf98db4e5b2edb202842003c00c2 < 49fa670efdfdd27e29145cbd2beef065c08717ef
Linux 6.13

Full technical detail▾

Overview

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.

Affected

Linux >= 7c7e6c8924e7bf98db4e5b2edb202842003c00c2 < 9f67997353caa29c6a080789a1fb6e01fb50c118
Linux >= 7c7e6c8924e7bf98db4e5b2edb202842003c00c2 < 49fa670efdfdd27e29145cbd2beef065c08717ef
Linux 6.13

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#cve.org

serial: 8250_port: recognize UPIO_AU

▾ Sunlit zone — Low / medium · no exploitation signal

Depth score3/ 100 · Minimal

impact 2.8 · likelihood 0 · exploitation 0

Overview

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:

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.