{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-43045",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-05-01T14:12:55.979Z",
        "datePublished": "2026-05-01T14:15:40.976Z",
        "dateUpdated": "2026-10-15T10:07:06.820Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-15T10:07:06.820Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmshv: Fix error handling in mshv_region_pin\n\nThe current error handling has two issues:\n\nFirst, pin_user_pages_fast() can return a short pin count (less than\nrequested but greater than zero) when it cannot pin all requested pages.\nThis is treated as success, leading to partially pinned regions being\nused, which causes memory corruption.\n\nSecond, when an error occurs mid-loop, already pinned pages from the\ncurrent batch are not properly accounted for before calling\nmshv_region_invalidate_pages(), causing a page reference leak.\n\nTreat short pins as errors and fix partial batch accounting before\ncleanup."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/hv/mshv_regions.c"
                    ],
                    "versions": [
                        {
                            "version": "621191d709b14882270dfd8ea5d7d6cdfebe2c35",
                            "lessThan": "d14847cb7f65d419e43451d416a1f50c09a5f3be",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "621191d709b14882270dfd8ea5d7d6cdfebe2c35",
                            "lessThan": "a7d149152bc5a9119854331c57be35ad31fdf5cc",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "621191d709b14882270dfd8ea5d7d6cdfebe2c35",
                            "lessThan": "c0e296f257671ba10249630fe58026f29e4804d9",
                            "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/hv/mshv_regions.c"
                    ],
                    "versions": [
                        {
                            "version": "6.15",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.15",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.57",
                            "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": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.15",
                                    "versionEndExcluding": "6.18.57"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.15",
                                    "versionEndExcluding": "6.19.12"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.15",
                                    "versionEndExcluding": "7.0"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/d14847cb7f65d419e43451d416a1f50c09a5f3be"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a7d149152bc5a9119854331c57be35ad31fdf5cc"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c0e296f257671ba10249630fe58026f29e4804d9"
                }
            ],
            "title": "mshv: Fix error handling in mshv_region_pin",
            "x_generator": {
                "engine": "bippy-1.2.0"
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        }
    }
}