{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-46159",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-05-13T15:03:33.102Z",
        "datePublished": "2026-05-28T09:36:14.676Z",
        "dateUpdated": "2026-06-19T11:59:41.263Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-06-19T11:59:41.263Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak\n\nbtrfs_ioctl_space_info() has a TOCTOU race between two passes over the\nblock group RAID type lists. The first pass counts entries to determine\nthe allocation size, then the second pass fills the buffer. The\ngroups_sem rwlock is released between passes, allowing concurrent block\ngroup removal to reduce the entry count.\n\nWhen the second pass fills fewer entries than the first pass counted,\ncopy_to_user() copies the full alloc_size bytes including trailing\nuninitialized kmalloc bytes to userspace.\n\nFix by copying only total_spaces entries (the actually-filled count from\nthe second pass) instead of alloc_size bytes, and switch to kzalloc so\nany future copy size mismatch cannot leak heap data."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/btrfs/ioctl.c"
                    ],
                    "versions": [
                        {
                            "version": "7fde62bffb576d384ea49a3aed3403d5609ee5bc",
                            "lessThan": "f407aad350bdea4db300c47433573b7a41630d33",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "7fde62bffb576d384ea49a3aed3403d5609ee5bc",
                            "lessThan": "d8224b1be6627c6c3b204bfb264508d27c65ac44",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "7fde62bffb576d384ea49a3aed3403d5609ee5bc",
                            "lessThan": "d69a4a6813fdba7c4cc3695a7e843842b240790d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "7fde62bffb576d384ea49a3aed3403d5609ee5bc",
                            "lessThan": "f5ee467b56764964027c361641f64953fc0f8f9a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "7fde62bffb576d384ea49a3aed3403d5609ee5bc",
                            "lessThan": "4fdc6ee0802121d9cd96b8d085e589f51e5a4ec3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "7fde62bffb576d384ea49a3aed3403d5609ee5bc",
                            "lessThan": "5d12e0ab009ade48c1bff9324fd9bea2c773d088",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "7fde62bffb576d384ea49a3aed3403d5609ee5bc",
                            "lessThan": "d09d67d5de577cedae3de9497dff217e0ac8b641",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "7fde62bffb576d384ea49a3aed3403d5609ee5bc",
                            "lessThan": "973e57c726c1f8e77259d1c8e519519f1e9aea77",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/btrfs/ioctl.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.34",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.34",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.259",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.210",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.176",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.140",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.90",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.32",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.7",
                            "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": "2.6.34",
                                    "versionEndExcluding": "5.10.259"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.34",
                                    "versionEndExcluding": "5.15.210"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.34",
                                    "versionEndExcluding": "6.1.176"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.34",
                                    "versionEndExcluding": "6.6.140"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.34",
                                    "versionEndExcluding": "6.12.90"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.34",
                                    "versionEndExcluding": "6.18.32"
                                },
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.34",
                                    "versionEndExcluding": "7.0.7"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.34",
                                    "versionEndExcluding": "7.1"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/f407aad350bdea4db300c47433573b7a41630d33"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d8224b1be6627c6c3b204bfb264508d27c65ac44"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d69a4a6813fdba7c4cc3695a7e843842b240790d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f5ee467b56764964027c361641f64953fc0f8f9a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/4fdc6ee0802121d9cd96b8d085e589f51e5a4ec3"
                },
                {
                    "url": "https://git.kernel.org/stable/c/5d12e0ab009ade48c1bff9324fd9bea2c773d088"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d09d67d5de577cedae3de9497dff217e0ac8b641"
                },
                {
                    "url": "https://git.kernel.org/stable/c/973e57c726c1f8e77259d1c8e519519f1e9aea77"
                }
            ],
            "title": "btrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak",
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