{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-89751",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-11T19:38:34.762Z",
        "datePublished": "2026-09-11T19:46:55.314Z",
        "dateUpdated": "2026-10-19T08:52:05.025Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T08:52:05.025Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/tdx: Fix off-by-one in port I/O handling\n\nhandle_in() and handle_out() in arch/x86/coco/tdx/tdx.c use:\n\n    u64 mask = GENMASK(BITS_PER_BYTE * size, 0);\n\nGENMASK(h, l) includes bit h. For size=1 (INB), this produces\nGENMASK(8, 0) = 0x1FF (9 bits) instead of GENMASK(7, 0) = 0xFF (8\nbits). The mask is one bit too wide for all I/O sizes.\n\nFix the mask calculation."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/x86/coco/tdx/tdx.c"
                    ],
                    "versions": [
                        {
                            "version": "03149948832a078f759022ed5b92e722d8d23c26",
                            "lessThan": "c6875423ad849ac234ab9812eb72f37ff8a490b4",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "03149948832a078f759022ed5b92e722d8d23c26",
                            "lessThan": "220011fe95fc78b2bc2d7d43893bc73957a5c811",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "03149948832a078f759022ed5b92e722d8d23c26",
                            "lessThan": "222b7005e4519f633b4cd666226256abbab46a1a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "03149948832a078f759022ed5b92e722d8d23c26",
                            "lessThan": "c4a22154870813d10aa0b4c734a574c726f9d4b0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "03149948832a078f759022ed5b92e722d8d23c26",
                            "lessThan": "bb45f705c4440dd3c689328319b88dd28770bbb8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "03149948832a078f759022ed5b92e722d8d23c26",
                            "lessThan": "0f63e656b1c679d32ac595de29d10c03efca6a25",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/x86/coco/tdx/tdx.c"
                    ],
                    "versions": [
                        {
                            "version": "5.19",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.19",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.188",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.157",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.109",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.50",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.4",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "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": "5.19",
                                    "versionEndExcluding": "6.1.188"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.19",
                                    "versionEndExcluding": "6.6.157"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.19",
                                    "versionEndExcluding": "6.12.109"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.19",
                                    "versionEndExcluding": "6.18.50"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.19",
                                    "versionEndExcluding": "7.2.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.19",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/c6875423ad849ac234ab9812eb72f37ff8a490b4"
                },
                {
                    "url": "https://git.kernel.org/stable/c/220011fe95fc78b2bc2d7d43893bc73957a5c811"
                },
                {
                    "url": "https://git.kernel.org/stable/c/222b7005e4519f633b4cd666226256abbab46a1a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c4a22154870813d10aa0b4c734a574c726f9d4b0"
                },
                {
                    "url": "https://git.kernel.org/stable/c/bb45f705c4440dd3c689328319b88dd28770bbb8"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0f63e656b1c679d32ac595de29d10c03efca6a25"
                }
            ],
            "title": "x86/tdx: Fix off-by-one in port I/O handling",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}