{"schema_version":"1.7.5","id":"CVE-2025-37856","published":"2025-05-09T06:42:04.315Z","modified":"2026-07-15T01:49:02.182558930Z","related":["SUSE-SU-2025:02846-1","SUSE-SU-2025:02853-1","SUSE-SU-2025:02923-1","SUSE-SU-2025:02969-1","SUSE-SU-2025:02996-1","SUSE-SU-2025:02997-1","SUSE-SU-2025:03011-1","SUSE-SU-2025:03023-1","SUSE-SU-2025:20577-1","SUSE-SU-2025:20586-1","SUSE-SU-2025:20601-1","SUSE-SU-2025:20602-1","SUSE-SU-2025:21074-1","SUSE-SU-2025:21139-1","SUSE-SU-2025:21179-1","SUSE-SU-2026:20560-1","openSUSE-SU-2025:20081-1"],"summary":"btrfs: harden block_group::bg_list against list_del() races","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: harden block_group::bg_list against list_del() races\n\nAs far as I can tell, these calls of list_del_init() on bg_list cannot\nrun concurrently with btrfs_mark_bg_unused() or btrfs_mark_bg_to_reclaim(),\nas they are in transaction error paths and situations where the block\ngroup is readonly.\n\nHowever, if there is any chance at all of racing with mark_bg_unused(),\nor a different future user of bg_list, better to be safe than sorry.\n\nOtherwise we risk the following interleaving (bg_list refcount in parens)\n\nT1 (some random op)                       T2 (btrfs_mark_bg_unused)\n                                        !list_empty(&bg->bg_list); (1)\nlist_del_init(&bg->bg_list); (1)\n                                        list_move_tail (1)\nbtrfs_put_block_group (0)\n                                        btrfs_delete_unused_bgs\n                                             bg = list_first_entry\n                                             list_del_init(&bg->bg_list);\n                                             btrfs_put_block_group(bg); (-1)\n\nUltimately, this results in a broken ref count that hits zero one deref\nearly and the real final deref underflows the refcount, resulting in a WARNING.","affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a9f189716cf15913c453299d72f69c51a9b0f86b"},{"fixed":"bf089c4d1141b27332c092b1dcca5022c415a3b6"},{"fixed":"909e60fb469d4101c6b08cf6e622efb062bb24a1"},{"fixed":"185fd73e5ac06027c4be9a129e59193f6a3ef202"},{"fixed":"7511e29cf1355b2c47d0effb39e463119913e2f6"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"edf3b5aadb2515c808200b904baa5b70a727f0ac"},{"last_affected":"01eca70ef8cf499d0cb6d1bbd691558e7792cf17"},{"last_affected":"5d19abcffd8404078dfa7d7118cec357b5e7bc58"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.15.128"},{"fixed":"5.16"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.1.47"},{"fixed":"6.2"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.4.12"},{"fixed":"6.5"}]}],"versions":["v5.15.127","v6.1.46","v6.4.11","v6.4.10","v6.1.45","v5.15.126","v5.15.125","v6.4.9","v6.1.44","v6.4.8","v6.1.43","v5.15.124","v6.4.7","v6.1.42","v5.15.123","v6.4.6","v6.1.41","v5.15.122","v5.15.121","v6.4.5","v6.1.40","v6.4.4","v6.1.39","v5.15.120","v6.4.3","v6.1.38","v6.4","v6.4.2","v6.4-rc7","v6.4-rc1","v6.4.1","v6.1.37","v5.15.119","v6.1.36","v6.4-rc6","v6.1.35","v5.15.118","v6.4-rc5","v6.4-rc3","v6.1.34","v5.15.117","v6.4-rc4","v6.4-rc2","v6.1.33","v5.15.116","v6.1.32","v5.15.115","v6.1.31","v5.15.114","v6.1.30","v5.15.113","v5.15.112","v6.1.29","v6.1.28","v5.15.111","v6.3","v6.1.27","v5.15.110","v6.1.26","v5.15.109","v6.3-rc1","v6.1.25","v5.15.108","v6.3-rc7","v6.3-rc2","v6.3-rc3","v6.3-rc5","v6.3-rc6","v6.3-rc4","v6.1.24","v5.15.107","v6.2-rc6","v6.1.23","v5.15.106","v6.1.22","v5.15.105","v6.1.21","v5.15.104","v6.1.20","v5.15.103","v6.1.19","v5.15.102","v6.1.18","v5.15.101","v5.15.100","v5.15.99","v6.1.17","v6.1.16","v5.15.98","v6.1.15","v6.2-rc1","v6.2","v5.15.97","v6.1.14","v5.15.96","v5.15.95","v6.1.13","v6.2-rc2","v6.2-rc8","v6.1.12","v5.15.94","v6.2-rc5","v6.2-rc4","v5.15.93","v6.1.11","v6.2-rc7","v6.1.10","v5.15.92","v6.2-rc3","v6.1.9","v5.15.91","v6.1.8","v5.15.90","v6.1.7","v5.15.89","v6.1.6","v5.15.88","v6.1-rc1","v6.1.5","v5.15.87","v6.1.4","v5.15.86","v6.1.3","v6.1.2","v6.1.1","v5.15.85","v6.1","v5.15.84","v5.15.83","v6.1-rc8","v6.1-rc3","v5.15.82","v6.1-rc6","v5.15.81","v6.1-rc7","v6.1-rc4","v6.1-rc2","v5.15.80","v5.15.79","v6.1-rc5","v5.15.78","v5.15.77","v5.15.76","v5.15.75","v6.0-rc1","v5.15.74","v6.0","v5.15.73","v5.15.72","v6.0-rc7","v5.15.71","v6.0-rc3","v6.0-rc2","v5.15.70","v6.0-rc6","v6.0-rc4","v6.0-rc5","v5.15.69","v5.15.68","v5.15.67","v5.15.66","v5.15.65","v5.15.64","v5.19","v5.15.63","v5.15.62","v5.15.61","v5.15.60","v5.19-rc1","v5.15.59","v5.15.58","v5.19-rc5","v5.19-rc8","v5.19-rc6","v5.18","v5.19-rc2","v5.19-rc7","v5.15.57","v5.19-rc3","v5.15.56","v5.15.55","v5.19-rc4","v5.15.54","v5.15.53","v5.15.52","v5.15.51","v5.18-rc1","v5.15.50","v5.15.49","v5.15.48","v5.15.47","v5.15.46","v5.15.45","v5.15.44","v5.15.43","v5.18-rc7","v5.18-rc2","v5.15.42","v5.15.41","v5.15.40","v5.18-rc5","v5.17","v5.18-rc4","v5.18-rc3","v5.18-rc6","v5.15.39","v5.15.38","v5.15.37","v5.15.36","v5.15.35","v5.15.34","v5.15.33","v5.15.32","v5.17-rc6","v5.17-rc4","v5.15.31","v5.17-rc8","v5.17-rc7","v5.15.30","v5.17-rc1","v5.15.29","v5.17-rc3","v5.15.28","v5.17-rc2","v5.15.27","v5.15.26","v5.17-rc5","v5.16","v5.15.25","v5.15.24","v5.15.23","v5.15.22","v5.15.21","v5.15.20","v5.15.19","v5.15.18","v5.15.17","v5.15.16","v5.15.15","v5.16-rc1","v5.15.14","v5.16-rc8","v5.15.13","v5.16-rc5","v5.16-rc6","v5.15.12","v5.16-rc7","v5.15.11","v5.16-rc3","v5.16-rc2","v5.15.10","v5.15.9","v5.16-rc4","v5.15.8","v5.15.7","v5.15","v5.15.6","v5.15.5","v5.15.4","v5.15.3","v5.15.2","v5.15.1","v5.15-rc2","v5.15-rc1","v5.15-rc4","v5.15-rc7","v5.15-rc3","v5.15-rc5","v5.15-rc6","v5.14","v5.14-rc3","v5.14-rc1","v5.14-rc2","v5.14-rc7","v5.14-rc6","v5.13-rc1","v5.14-rc5","v5.14-rc4","v5.13","v5.13-rc6","v5.13-rc7","v5.13-rc3","v5.13-rc2","v5.13-rc4","v5.13-rc5","v5.12","v5.12-rc2","v5.12-rc1-dontuse","v5.12-rc1","v5.12-rc8","v5.12-rc3","v5.12-rc7","v5.12-rc5","v5.12-rc6","v5.12-rc4","v5.10","v5.11","v5.11-rc3","v5.11-rc7","v5.11-rc6","v5.11-rc5","v5.11-rc1","v5.11-rc4","v5.11-rc2","v5.10-rc1","v5.10-rc7","v5.10-rc4","v5.10-rc3","v5.10-rc6","v5.9","v5.10-rc2","v5.10-rc5","v5.9-rc1","v5.9-rc7","v5.9-rc8","v5.9-rc6","v5.9-rc4","v5.9-rc5","v5.9-rc3","v5.9-rc2","v5.8","v5.7","v5.8-rc2","v5.8-rc1","v5.8-rc7","v5.8-rc5","v5.8-rc3","v5.8-rc4","v5.8-rc6","v5.7-rc4","v5.7-rc7","v5.7-rc1","v5.7-rc3","v5.7-rc2","v5.7-rc5","v5.7-rc6","v5.6","v5.6-rc1","v5.6-rc7","v5.6-rc6","v5.6-rc3","v5.6-rc4","v5.6-rc2","v5.6-rc5","v5.5","v5.5-rc5","v5.5-rc7","v5.5-rc2","v5.5-rc1","v5.4","v5.5-rc4","v5.5-rc3","v5.5-rc6","v5.4-rc1","v5.4-rc6","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