{"id":"CVE-2026-98883","title":"serial: 8250_port: recognize UPIO_AU","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250_port: recognize UPIO_AU\n\nMy MIPS Alchemy systems generate the following warning during\nprobe of the 8250 driver:\n\nWARNING: drivers/tty/serial/8250/8250_por…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9f67997353caa29c6a080789a1fb6e01fb50c118","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 49fa670efdfdd27e29145cbd2beef065c08717ef","Linux < 6.18.53","Linux (all versions)"],"published":"2026-10-23","updated":"2026-10-23","sourceUpdated":"2026-10-23T11:37:38.372Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98883","references":[{"url":"https://git.kernel.org/stable/c/9f67997353caa29c6a080789a1fb6e01fb50c118"},{"url":"https://git.kernel.org/stable/c/49fa670efdfdd27e29145cbd2beef065c08717ef"}],"tags":["cve.org"],"ingestedAt":"2026-10-23T13:24:55.582Z","slug":"CVE-2026-98883","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250_port: recognize UPIO_AU\n\nMy MIPS Alchemy systems generate the following warning during\nprobe of the 8250 driver:\n\nWARNING: drivers/tty/serial/8250/8250_port.c:462 at set_io_from_upio+0xfc/0x124, CPU#0: swapper/0/1\nUnsupported UART type 4\n[...]\n[<80521d40>] set_io_from_upio+0xfc/0x124\n[<80521dfc>] serial8250_set_defaults+0x94/0xe0\n[<80520fb4>] serial8250_register_8250_port+0x288/0x51c\n[<805214ec>] serial8250_probe+0x160/0x1e8\n[<8053b5f0>] platform_probe+0x64/0x90\n\nThe least invasive fix is to recognize UPIO_AU (type 4) in set_io_from_upio()\nand do nothing, since all parameters have already been set up in\n8250_rt288x.c::au_platform_setup().\n\nRun-tested on Alchemy Au1300 platform.\n\n## Affected\n\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9f67997353caa29c6a080789a1fb6e01fb50c118`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 49fa670efdfdd27e29145cbd2beef065c08717ef`\n- `Linux < 6.18.53`\n- `Linux (all versions)`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}