{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-64294",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T15:36:31.778Z",
        "datePublished": "2026-07-25T08:49:32.570Z",
        "dateUpdated": "2026-08-23T12:45:40.258Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-23T12:45:40.258Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: do file ownership checks with the proper mount idmap\n\nEver since idmapped mounts were introduced, inode ownership checks (for\nside-channel protection) in mincore() and madvise(MADV_PAGEOUT) were done\nagainst the nop_mnt_idmap, which completely ignores the file's mount's\nidmap.  This results in odd edgecases like:\n\n1) mount/bind-mount with an idmap userA:userB:1\n2) userB runs an owner_or_capable() check on file that is owned by userA\non-disk/in-memory, but owned by userB after idmap translation\n3) owner_or_capable() mysteriously fails as the correct idmap wasn't supplied\n\nIn the case of mincore/madvise MADV_PAGEOUT, this is usually benign,\nbecause file_permission(file, MAY_WRITE) will probably succeed, as it uses\nthe proper idmap internally, but it does not need to be the case on e.g a\n0444 file where even the owner itself doesn't have permissions to write to\nit.\n\nSince this is clearly not trivial to get right, introduce a\nfile_owner_or_capable() that can carry the correct semantics, and switch\nthe various users in mm to it.\n\nThe issue was found by manual code inspection & an off-list discussion\nwith Jan Kara."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/linux/fs.h",
                        "mm/filemap.c",
                        "mm/madvise.c",
                        "mm/mincore.c"
                    ],
                    "versions": [
                        {
                            "version": "9caccd41541a6f7d6279928d9f971f6642c361af",
                            "lessThan": "7368bec565bac3e536cd43579dbde1e715e6ba61",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9caccd41541a6f7d6279928d9f971f6642c361af",
                            "lessThan": "b2f3d94ea310bea9d36d53e9d9b3f45e86c1d893",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9caccd41541a6f7d6279928d9f971f6642c361af",
                            "lessThan": "744b23aa430d52f5c8e4dbff7d71496d6643bed2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9caccd41541a6f7d6279928d9f971f6642c361af",
                            "lessThan": "8344bdf0629457e532797b42d9d2bbf2a2900bbf",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9caccd41541a6f7d6279928d9f971f6642c361af",
                            "lessThan": "5c942ad7df75925ee166e7f0fb36892d8dde376b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9caccd41541a6f7d6279928d9f971f6642c361af",
                            "lessThan": "04ba248d02d9eaa3d9077b00a6134caa75fa3e90",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9caccd41541a6f7d6279928d9f971f6642c361af",
                            "lessThan": "e187bc02f8fa4226d62814592cf064ee4557c470",
                            "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/fs.h",
                        "mm/filemap.c",
                        "mm/madvise.c",
                        "mm/mincore.c"
                    ],
                    "versions": [
                        {
                            "version": "5.12",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.12",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.217",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.184",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.145",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.96",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.39",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.4",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "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": "5.12",
                                    "versionEndExcluding": "5.15.217"
                                },
                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.12",
                                    "versionEndExcluding": "6.1.184"
                                },
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                                    "versionStartIncluding": "5.12",
                                    "versionEndExcluding": "6.6.145"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.12",
                                    "versionEndExcluding": "6.12.96"
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                                    "versionStartIncluding": "5.12",
                                    "versionEndExcluding": "6.18.39"
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                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.12",
                                    "versionEndExcluding": "7.1.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.12",
                                    "versionEndExcluding": "7.2"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/7368bec565bac3e536cd43579dbde1e715e6ba61"
                },
                {
                    "url": "https://git.kernel.org/stable/c/b2f3d94ea310bea9d36d53e9d9b3f45e86c1d893"
                },
                {
                    "url": "https://git.kernel.org/stable/c/744b23aa430d52f5c8e4dbff7d71496d6643bed2"
                },
                {
                    "url": "https://git.kernel.org/stable/c/8344bdf0629457e532797b42d9d2bbf2a2900bbf"
                },
                {
                    "url": "https://git.kernel.org/stable/c/5c942ad7df75925ee166e7f0fb36892d8dde376b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/04ba248d02d9eaa3d9077b00a6134caa75fa3e90"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e187bc02f8fa4226d62814592cf064ee4557c470"
                }
            ],
            "title": "mm: do file ownership checks with the proper mount idmap",
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