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CVE-2026-98883EUVD-2026-108677

serial: 8250_port: recognize UPIO_AU

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 6.18.53
None on Exploit-DB, Metasploit or GitHub

Summary

The Linux kernel's 8250 serial UART driver, used on MIPS Alchemy systems such as the Au1300, is affected. A missing case for the UPIO_AU port type caused a spurious kernel warning during driver probe, though the fix is a minor handling correction with no clear security impact described.

Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.

Read the original 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.

Timeline

  1. CVE published
  2. First seen by cve.now
  3. Record last updated

Affected versions

  • Linux Linux

    From 7c7e6c8924e7bf98db4e5b2edb202842003c00c2 · fixed in 9f67997353caa29c6a080789a1fb6e01fb50c118; From 7c7e6c8924e7bf98db4e5b2edb202842003c00c2 · fixed in 49fa670efdfdd27e29145cbd2beef065c08717ef

  • Linux Linux

    6.13

  • KernelLinux

    fixed in 6.18.53

References 2

git.kernel.org