serial: 8250_port: recognize UPIO_AU

{
  "id": "fa312399c6113cc5513741f2dd55769811a3e42dd742926c3bfcff022f1e8f65",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-98883",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "serial: 8250_port: recognize UPIO_AU",
    "summary": "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.",
    "evidence": "cve:CVE-2026-98883",
    "products": [
      {
        "name": {
          "value": "Linux",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "Linux",
          "evidence": "/containers/cna/affected/1/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98883",
      "aliases": [
        "CVE-2026-98883"
      ],
      "metrics": [],
      "affected": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7c7e6c8924e7bf98db4e5b2edb202842003c00c2",
              "lessThan": "9f67997353caa29c6a080789a1fb6e01fb50c118",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7c7e6c8924e7bf98db4e5b2edb202842003c00c2",
              "lessThan": "49fa670efdfdd27e29145cbd2beef065c08717ef",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/tty/serial/8250/8250_port.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.13",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/tty/serial/8250/8250_port.c"
          ],
          "defaultStatus": "affected"
        }
      ],
      "modified": "2026-10-26T06:56:06.942Z",
      "provider": "cve",
      "references": [
        "https://git.kernel.org/stable/c/9f67997353caa29c6a080789a1fb6e01fb50c118",
        "https://git.kernel.org/stable/c/49fa670efdfdd27e29145cbd2beef065c08717ef"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "shortName": "Linux",
          "dateUpdated": "2026-10-26T06:56:06.942Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98883",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-cve",
  "document_id": 263341,
  "published_at": "2026-10-23T11:37:38.372+00:00"
}