{"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": "2026-05-28T09:36:14.676Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-28T09:36:14.676Z"}, "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": "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": "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-rc1", "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": "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"}, {"vulnerable": true, "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-rc1"}]}]}], "references": [{"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", "x_generator": {"engine": "bippy-1.2.0"}}}}