{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-97480",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-24T16:01:01.149Z",
        "datePublished": "2026-09-24T16:04:22.893Z",
        "dateUpdated": "2026-10-21T12:52:51.861Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-21T12:52:51.861Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: serial: 8250: protect against NULL uart->port.dev in register\n\nserial8250_register_8250_port() conditionally copies uart->port.dev\nfrom up->port.dev only when up->port.dev is non-NULL:\n\n\tif (up->port.dev) {\n\t\tuart->port.dev = up->port.dev;\n\t\t...\n\t}\n\nSo if both the existing uart slot and up have a NULL ->dev,\nuart->port.dev remains NULL. The very next ACPI companion check\nthen dereferences it unconditionally:\n\n\tif (!has_acpi_companion(uart->port.dev)) {\n\nhas_acpi_companion() reads dev->fwnode 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: 'uart->port.dev' 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 ->dev."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/tty/serial/8250/8250_core.c"
                    ],
                    "versions": [
                        {
                            "version": "4a96895f74c9633b51427fd080ab70fa62b65bc4",
                            "lessThan": "68059b6e9f7292714286e2b0f5185ed2a43fccc5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4a96895f74c9633b51427fd080ab70fa62b65bc4",
                            "lessThan": "9c78f89cf2fbae18b14c78bf172ca15d832aff15",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4a96895f74c9633b51427fd080ab70fa62b65bc4",
                            "lessThan": "5cbab666721d974bfe033a12045d808936deaefd",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4a96895f74c9633b51427fd080ab70fa62b65bc4",
                            "lessThan": "941c9f84c9b6310f7aaa1c8c785dcc634ee33050",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/tty/serial/8250/8250_core.c"
                    ],
                    "versions": [
                        {
                            "version": "5.3",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.3",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.160",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.114",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.53",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.3",
                                    "versionEndExcluding": "6.6.160"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.3",
                                    "versionEndExcluding": "6.12.114"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.3",
                                    "versionEndExcluding": "6.18.53"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.3",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "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->port.dev in register",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}