{"api_version":"1","generated_at":"2026-05-13T21:18:52+00:00","cve":"CVE-2025-39759","urls":{"html":"https://cve.report/CVE-2025-39759","api":"https://cve.report/api/cve/CVE-2025-39759.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-39759","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-39759"},"summary":{"title":"btrfs: qgroup: fix race between quota disable and quota rescan ioctl","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: qgroup: fix race between quota disable and quota rescan ioctl\n\nThere's a race between a task disabling quotas and another running the\nrescan ioctl that can result in a use-after-free of qgroup records from\nthe fs_info->qgroup_tree rbtree.\n\nThis happens as follows:\n\n1) Task A enters btrfs_ioctl_quota_rescan() -> btrfs_qgroup_rescan();\n\n2) Task B enters btrfs_quota_disable() and calls\n   btrfs_qgroup_wait_for_completion(), which does nothing because at that\n   point fs_info->qgroup_rescan_running is false (it wasn't set yet by\n   task A);\n\n3) Task B calls btrfs_free_qgroup_config() which starts freeing qgroups\n   from fs_info->qgroup_tree without taking the lock fs_info->qgroup_lock;\n\n4) Task A enters qgroup_rescan_zero_tracking() which starts iterating\n   the fs_info->qgroup_tree tree while holding fs_info->qgroup_lock,\n   but task B is freeing qgroup records from that tree without holding\n   the lock, resulting in a use-after-free.\n\nFix this by taking fs_info->qgroup_lock at btrfs_free_qgroup_config().\nAlso at btrfs_qgroup_rescan() don't start the rescan worker if quotas\nwere already disabled.","state":"PUBLISHED","assigner":"Linux","published_at":"2025-09-11 17:15:39","updated_at":"2026-05-12 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the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: qgroup: fix race between quota disable and quota rescan ioctl\n\nThere's a race between a task disabling quotas and another running the\nrescan ioctl that can result in a use-after-free of qgroup records from\nthe fs_info->qgroup_tree rbtree.\n\nThis happens as follows:\n\n1) Task A enters btrfs_ioctl_quota_rescan() -> btrfs_qgroup_rescan();\n\n2) Task B enters btrfs_quota_disable() and calls\n   btrfs_qgroup_wait_for_completion(), which does nothing because at that\n   point fs_info->qgroup_rescan_running is false (it wasn't set yet by\n   task A);\n\n3) Task B calls btrfs_free_qgroup_config() which starts freeing qgroups\n   from fs_info->qgroup_tree without taking the lock fs_info->qgroup_lock;\n\n4) Task A enters qgroup_rescan_zero_tracking() which starts iterating\n   the fs_info->qgroup_tree tree while holding fs_info->qgroup_lock,\n   but task B is freeing qgroup records from that tree without holding\n   the lock, resulting in a use-after-free.\n\nFix this by taking fs_info->qgroup_lock at btrfs_free_qgroup_config().\nAlso at btrfs_qgroup_rescan() don't start the rescan worker if quotas\nwere already disabled."}],"providerMetadata":{"dateUpdated":"2026-05-11T21:35:42.611Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/7cda0fdde5d9890976861421d207870500f9aace"},{"url":"https://git.kernel.org/stable/c/b172535ccba12f0cf7d23b3b840989de47fc104d"},{"url":"https://git.kernel.org/stable/c/dd0b28d877b293b1d7f8727a7de08ae36b6b9ef0"},{"url":"https://git.kernel.org/stable/c/c38028ce0d0045ca600b6a8345a0ff92bfb47b66"},{"url":"https://git.kernel.org/stable/c/2fd0f5ceb997f90f4332ccbab6c7e907e6b2d0eb"},{"url":"https://git.kernel.org/stable/c/e1249667750399a48cafcf5945761d39fa584edf"}],"title":"btrfs: qgroup: fix race between quota disable and quota rescan 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qgroup: fix race between quota disable and quota rescan i","CVE":"CVE-2025-39759","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"39759","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: qgroup: fix race between quota disable and quota rescan ioctl\n\nThere's a race between a task disabling quotas and another running the\nrescan ioctl that can result in a use-after-free of qgroup records from\nthe fs_info->qgroup_tree rbtree.\n\nThis happens as follows:\n\n1) Task A enters btrfs_ioctl_quota_rescan() -> btrfs_qgroup_rescan();\n\n2) Task B enters btrfs_quota_disable() and calls\n   btrfs_qgroup_wait_for_completion(), which does nothing because at that\n   point fs_info->qgroup_rescan_running is false (it wasn't set yet by\n   task A);\n\n3) Task B calls btrfs_free_qgroup_config() which starts freeing qgroups\n   from fs_info->qgroup_tree without taking the lock fs_info->qgroup_lock;\n\n4) Task A enters qgroup_rescan_zero_tracking() which starts iterating\n   the fs_info->qgroup_tree tree while holding fs_info->qgroup_lock,\n   but task B is freeing qgroup records from that tree without holding\n   the lock, resulting in a use-after-free.\n\nFix this by taking fs_info->qgroup_lock at btrfs_free_qgroup_config().\nAlso at btrfs_qgroup_rescan() don't start the rescan worker if quotas\nwere already disabled.","Type":"Description","Title":"btrfs: qgroup: fix race between quota disable and quota rescan i"}]}}}