{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-31575",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-03-09T15:48:24.119Z",
        "datePublished": "2026-04-24T14:42:07.502Z",
        "dateUpdated": "2026-06-14T17:41:58.519Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-06-14T17:41:58.519Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/userfaultfd: fix hugetlb fault mutex hash calculation\n\nIn mfill_atomic_hugetlb(), linear_page_index() is used to calculate the\npage index for hugetlb_fault_mutex_hash().  However, linear_page_index()\nreturns the index in PAGE_SIZE units, while hugetlb_fault_mutex_hash()\nexpects the index in huge page units.  This mismatch means that different\naddresses within the same huge page can produce different hash values,\nleading to the use of different mutexes for the same huge page.  This can\ncause races between faulting threads, which can corrupt the reservation\nmap and trigger the BUG_ON in resv_map_release().\n\nFix this by introducing hugetlb_linear_page_index(), which returns the\npage index in huge page granularity, and using it in place of\nlinear_page_index()."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/linux/hugetlb.h",
                        "mm/userfaultfd.c"
                    ],
                    "versions": [
                        {
                            "version": "a08c7193e4f18dc8508f2d07d0de2c5b94cb39a3",
                            "lessThan": "5a525c43baaba0bf3063f86996ca3623b71e4172",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a08c7193e4f18dc8508f2d07d0de2c5b94cb39a3",
                            "lessThan": "574501ede47ac439afd67ba9812bc66722d500ba",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a08c7193e4f18dc8508f2d07d0de2c5b94cb39a3",
                            "lessThan": "08282b1bf74c69fc8ecd25493e7fdb5460f01290",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a08c7193e4f18dc8508f2d07d0de2c5b94cb39a3",
                            "lessThan": "f4689fc089765d36c026063fb22d23533e883eb6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a08c7193e4f18dc8508f2d07d0de2c5b94cb39a3",
                            "lessThan": "0217c7fb4de4a40cee667eb21901f3204effe5ac",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/linux/hugetlb.h",
                        "mm/userfaultfd.c"
                    ],
                    "versions": [
                        {
                            "version": "6.7",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.7",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.84",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.24",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.14",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.1",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "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": "6.7",
                                    "versionEndExcluding": "6.12.84"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.7",
                                    "versionEndExcluding": "6.18.24"
                                },
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.7",
                                    "versionEndExcluding": "6.19.14"
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                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.7",
                                    "versionEndExcluding": "7.1"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/5a525c43baaba0bf3063f86996ca3623b71e4172"
                },
                {
                    "url": "https://git.kernel.org/stable/c/574501ede47ac439afd67ba9812bc66722d500ba"
                },
                {
                    "url": "https://git.kernel.org/stable/c/08282b1bf74c69fc8ecd25493e7fdb5460f01290"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f4689fc089765d36c026063fb22d23533e883eb6"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0217c7fb4de4a40cee667eb21901f3204effe5ac"
                }
            ],
            "title": "mm/userfaultfd: fix hugetlb fault mutex hash calculation",
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                "engine": "bippy-1.2.0"
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}