{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-31751",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-03-09T15:48:24.139Z",
        "datePublished": "2026-05-01T14:14:43.551Z",
        "dateUpdated": "2026-05-11T22:15:06.157Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T22:15:06.157Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: dt2815: add hardware detection to prevent crash\n\nThe dt2815 driver crashes when attached to I/O ports without actual\nhardware present. This occurs because syzkaller or users can attach\nthe driver to arbitrary I/O addresses via COMEDI_DEVCONFIG ioctl.\n\nWhen no hardware exists at the specified port, inb() operations return\n0xff (floating bus), but outb() operations can trigger page faults due\nto undefined behavior, especially under race conditions:\n\n  BUG: unable to handle page fault for address: 000000007fffff90\n  #PF: supervisor write access in kernel mode\n  #PF: error_code(0x0002) - not-present page\n  RIP: 0010:dt2815_attach+0x6e0/0x1110\n\nAdd hardware detection by reading the status register before attempting\nany write operations. If the read returns 0xff, assume no hardware is\npresent and fail the attach with -ENODEV. This prevents crashes from\noutb() operations on non-existent hardware."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/comedi/drivers/dt2815.c"
                    ],
                    "versions": [
                        {
                            "version": "d6a929b7608ae157cef86d00cc580d1038f0b985",
                            "lessThan": "8d63161837f1bf8810dbcd2a583c2bbf5ca6d733",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d6a929b7608ae157cef86d00cc580d1038f0b985",
                            "lessThan": "d2a786efdb9971f2a647724625da5bbecc994dc9",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d6a929b7608ae157cef86d00cc580d1038f0b985",
                            "lessThan": "0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d6a929b7608ae157cef86d00cc580d1038f0b985",
                            "lessThan": "d5d9df8b08d68d083ac57abc2c887dfb1f31af63",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d6a929b7608ae157cef86d00cc580d1038f0b985",
                            "lessThan": "65c528fbeddd88478c210052f6c7b21be4973156",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d6a929b7608ae157cef86d00cc580d1038f0b985",
                            "lessThan": "34c8b3a91bdfbe4573650b4cd750ef639101fdc5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d6a929b7608ae157cef86d00cc580d1038f0b985",
                            "lessThan": "34b13250c618d7441508c6ef369144aa8a9b9bfa",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d6a929b7608ae157cef86d00cc580d1038f0b985",
                            "lessThan": "93853512f565e625df2397f0d8050d6aafd7c3ad",
                            "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/comedi/drivers/dt2815.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.30",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.30",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.253",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.203",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.168",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.134",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.81",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.22",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.12",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
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                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.30",
                                    "versionEndExcluding": "5.10.253"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.30",
                                    "versionEndExcluding": "5.15.203"
                                },
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.30",
                                    "versionEndExcluding": "7.0"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/8d63161837f1bf8810dbcd2a583c2bbf5ca6d733"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d2a786efdb9971f2a647724625da5bbecc994dc9"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0dcf33994b8dcf3db36530fb7e2cf9f89e5cbac3"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d5d9df8b08d68d083ac57abc2c887dfb1f31af63"
                },
                {
                    "url": "https://git.kernel.org/stable/c/65c528fbeddd88478c210052f6c7b21be4973156"
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                {
                    "url": "https://git.kernel.org/stable/c/34c8b3a91bdfbe4573650b4cd750ef639101fdc5"
                },
                {
                    "url": "https://git.kernel.org/stable/c/34b13250c618d7441508c6ef369144aa8a9b9bfa"
                },
                {
                    "url": "https://git.kernel.org/stable/c/93853512f565e625df2397f0d8050d6aafd7c3ad"
                }
            ],
            "title": "comedi: dt2815: add hardware detection to prevent crash",
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}