{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "7fde62bffb576d384ea49a3aed3403d5609ee5bc"
            },
            {
              "fixed": "f407aad350bdea4db300c47433573b7a41630d33"
            },
            {
              "fixed": "d8224b1be6627c6c3b204bfb264508d27c65ac44"
            },
            {
              "fixed": "d69a4a6813fdba7c4cc3695a7e843842b240790d"
            },
            {
              "fixed": "f5ee467b56764964027c361641f64953fc0f8f9a"
            },
            {
              "fixed": "4fdc6ee0802121d9cd96b8d085e589f51e5a4ec3"
            },
            {
              "fixed": "5d12e0ab009ade48c1bff9324fd9bea2c773d088"
            },
            {
              "fixed": "d09d67d5de577cedae3de9497dff217e0ac8b641"
            },
            {
              "fixed": "973e57c726c1f8e77259d1c8e519519f1e9aea77"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.34"
            },
            {
              "fixed": "5.10.259"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.140"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.90"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.32"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46159.json"
  },
  "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.",
  "id": "CVE-2026-46159",
  "modified": "2026-07-08T05:37:02.933223453Z",
  "published": "2026-05-28T09:36:14.676Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4fdc6ee0802121d9cd96b8d085e589f51e5a4ec3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d12e0ab009ade48c1bff9324fd9bea2c773d088"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/973e57c726c1f8e77259d1c8e519519f1e9aea77"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d09d67d5de577cedae3de9497dff217e0ac8b641"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d69a4a6813fdba7c4cc3695a7e843842b240790d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d8224b1be6627c6c3b204bfb264508d27c65ac44"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f407aad350bdea4db300c47433573b7a41630d33"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f5ee467b56764964027c361641f64953fc0f8f9a"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46159.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46159"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "btrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak"
}