{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-45851",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-05-13T15:03:33.079Z",
        "datePublished": "2026-05-27T12:15:23.221Z",
        "dateUpdated": "2026-05-27T12:15:23.221Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-27T12:15:23.221Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nefi: Fix reservation of unaccepted memory table\n\nThe reserve_unaccepted() function incorrectly calculates the size of the\nmemblock reservation for the unaccepted memory table. It aligns the\nsize of the table, but fails to account for cases where the table's\nstarting physical address (efi.unaccepted) is not page-aligned.\n\nIf the table starts at an offset within a page and its end crosses into\na subsequent page that the aligned size does not cover, the end of the\ntable will not be reserved. This can lead to the table being overwritten\nor inaccessible, causing a kernel panic in accept_memory().\n\nThis issue was observed when starting Intel TDX VMs with specific memory\nsizes (e.g., > 64GB).\n\nFix this by calculating the end address first (including the unaligned\nstart) and then aligning it up, ensuring the entire range is covered\nby the reservation."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/firmware/efi/efi.c"
                    ],
                    "versions": [
                        {
                            "version": "8dbe33956d96c9d066ef15ca933ede30748198b2",
                            "lessThan": "b7bc182ec1846be437351e44164089d988f9d0dd",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8dbe33956d96c9d066ef15ca933ede30748198b2",
                            "lessThan": "ba6b6f1502fa55621d1db23f253d54322bdbe4e0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8dbe33956d96c9d066ef15ca933ede30748198b2",
                            "lessThan": "9b18bf59977f5c5bc3b11b210520f62500a7adf3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8dbe33956d96c9d066ef15ca933ede30748198b2",
                            "lessThan": "e649b5916725c68f44ebf45fb396df563c5dbaf2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8dbe33956d96c9d066ef15ca933ede30748198b2",
                            "lessThan": "0862438c90487e79822d5647f854977d50381505",
                            "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/firmware/efi/efi.c"
                    ],
                    "versions": [
                        {
                            "version": "6.6",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.6",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.128",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.75",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.14",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.4",
                            "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": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6",
                                    "versionEndExcluding": "6.6.128"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6",
                                    "versionEndExcluding": "6.12.75"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6",
                                    "versionEndExcluding": "6.18.14"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6",
                                    "versionEndExcluding": "6.19.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6",
                                    "versionEndExcluding": "7.0"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/b7bc182ec1846be437351e44164089d988f9d0dd"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ba6b6f1502fa55621d1db23f253d54322bdbe4e0"
                },
                {
                    "url": "https://git.kernel.org/stable/c/9b18bf59977f5c5bc3b11b210520f62500a7adf3"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e649b5916725c68f44ebf45fb396df563c5dbaf2"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0862438c90487e79822d5647f854977d50381505"
                }
            ],
            "title": "efi: Fix reservation of unaccepted memory table",
            "x_generator": {
                "engine": "bippy-1.2.0"
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    }
}