CVE-2026-97480 (GCVE-0-2026-97480)
Vulnerability from cvelistv5
Published
2026-09-24 16:04
Modified
2026-10-30 12:37
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: tty: serial: 8250: protect against NULL uart->port.dev in register serial8250_register_8250_port() conditionally copies uart->port.dev from up->port.dev only when up->port.dev is non-NULL: if (up->port.dev) { uart->port.dev = up->port.dev; ... } So if both the existing uart slot and up have a NULL ->dev, uart->port.dev remains NULL. The very next ACPI companion check then dereferences it unconditionally: if (!has_acpi_companion(uart->port.dev)) { has_acpi_companion() reads dev->fwnode without a NULL guard (include/linux/acpi.h), so this NULL-derefs the kernel for the remaining no-dev case rather than just skipping the mctrl_gpio_init() initialisation as intended. smatch flags the inconsistency: drivers/tty/serial/8250/8250_core.c:767 serial8250_register_8250_port() error: 'uart->port.dev' could be null (see line 719) Guard the call with a NULL check so register continues to work for callers that legitimately have no parent device (legacy non-OF/non-ACPI registrations). No functional change for callers that pass a non-NULL ->dev.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4a96895f74c9633b51427fd080ab70fa62b65bc4
Version: 4a96895f74c9633b51427fd080ab70fa62b65bc4
Version: 4a96895f74c9633b51427fd080ab70fa62b65bc4
Version: 4a96895f74c9633b51427fd080ab70fa62b65bc4
Version: 4a96895f74c9633b51427fd080ab70fa62b65bc4
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/serial/8250/8250_core.c"
          ],
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/serial/8250/8250_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "lessThan": "5.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.114",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.191",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.114",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: serial: 8250: protect against NULL uart-\u003eport.dev in register\n\nserial8250_register_8250_port() conditionally copies uart-\u003eport.dev\nfrom up-\u003eport.dev only when up-\u003eport.dev is non-NULL:\n\n\tif (up-\u003eport.dev) {\n\t\tuart-\u003eport.dev = up-\u003eport.dev;\n\t\t...\n\t}\n\nSo if both the existing uart slot and up have a NULL -\u003edev,\nuart-\u003eport.dev remains NULL. The very next ACPI companion check\nthen dereferences it unconditionally:\n\n\tif (!has_acpi_companion(uart-\u003eport.dev)) {\n\nhas_acpi_companion() reads dev-\u003efwnode without a NULL guard\n(include/linux/acpi.h), so this NULL-derefs the kernel for the\nremaining no-dev case rather than just skipping the\nmctrl_gpio_init() initialisation as intended.\n\nsmatch flags the inconsistency:\n\n  drivers/tty/serial/8250/8250_core.c:767\n  serial8250_register_8250_port() error: \u0027uart-\u003eport.dev\u0027 could be\n  null (see line 719)\n\nGuard the call with a NULL check so register continues to work\nfor callers that legitimately have no parent device (legacy\nnon-OF/non-ACPI registrations).\n\nNo functional change for callers that pass a non-NULL -\u003edev."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:37:01.897Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f728f7f38a6eca16923c72fc6826445810d2b41f"
        },
        {
          "url": "https://git.kernel.org/stable/c/68059b6e9f7292714286e2b0f5185ed2a43fccc5"
        },
        {
          "url": "https://git.kernel.org/stable/c/9c78f89cf2fbae18b14c78bf172ca15d832aff15"
        },
        {
          "url": "https://git.kernel.org/stable/c/5cbab666721d974bfe033a12045d808936deaefd"
        },
        {
          "url": "https://git.kernel.org/stable/c/941c9f84c9b6310f7aaa1c8c785dcc634ee33050"
        }
      ],
      "title": "tty: serial: 8250: protect against NULL uart-\u003eport.dev in register",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97480",
    "datePublished": "2026-09-24T16:04:22.893Z",
    "dateReserved": "2026-09-24T16:01:01.149Z",
    "dateUpdated": "2026-10-30T12:37:01.897Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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