{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46159",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-46159"
  ],
  "published": "2026-05-28T09:36:53Z",
  "summary": "btrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak",
  "details": "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.",
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