{"id":"CVE-2026-46251","summary":"btrfs: fix block_group_tree dirty_list corruption","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix block_group_tree dirty_list corruption\n\nWhen the incompat flag EXTENT_TREE_V2 is set, we unconditionally add the\nblock group tree to the switch_commits list before calling\nswitch_commit_roots, as we do for the tree root and the chunk root.\nHowever, the block group tree uses normal root dirty tracking and in any\ntransaction that does an allocation and dirties a block group, the block\ngroup root will already be linked to a list by the dirty_list field and\nthis use of list_add_tail() is invalid and corrupts the prev/next\nmembers of block_group_root-\u003edirty_list.\n\nThis is apparent on a subsequent list_del on the prev if we enable\nCONFIG_DEBUG_LIST:\n\n  [32.1571] ------------[ cut here ]------------\n  [32.1572] list_del corruption. next-\u003eprev should beffff958890202538, but was ffff9588992bd538. (next=ffff958890201538)\n  [32.1575] WARNING: lib/list_debug.c:65 at 0x0, CPU#3: sync/607\n  [32.1583] CPU: 3 UID: 0 PID: 607 Comm: sync Not tainted 6.18.0 #24PREEMPT(none)\n  [32.1585] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS1.17.0-4.fc41 04/01/2014\n  [32.1587] RIP: 0010:__list_del_entry_valid_or_report+0x108/0x120\n  [32.1593] RSP: 0018:ffffaa288287fdd0 EFLAGS: 00010202\n  [32.1594] RAX: 0000000000000001 RBX: ffff95889326e800 RCX:ffff958890201538\n  [32.1596] RDX: ffff9588992bd538 RSI: ffff958890202538 RDI:ffffffff82a41e00\n  [32.1597] RBP: ffff958890202538 R08: ffffffff828fc1e8 R09:00000000ffffefff\n  [32.1599] R10: ffffffff8288c200 R11: ffffffff828e4200 R12:ffff958890201538\n  [32.1601] R13: ffff95889326e958 R14: ffff958895c24000 R15:ffff958890202538\n  [32.1603] FS:  00007f0c28eb5740(0000) GS:ffff958af2bd2000(0000)knlGS:0000000000000000\n  [32.1605] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  [32.1607] CR2: 00007f0c28e8a3cc CR3: 0000000109942005 CR4:0000000000370ef0\n  [32.1609] Call Trace:\n  [32.1610]  \u003cTASK\u003e\n  [32.1611]  switch_commit_roots+0x82/0x1d0 [btrfs]\n  [32.1615]  btrfs_commit_transaction+0x968/0x1550 [btrfs]\n  [32.1618]  ? btrfs_attach_transaction_barrier+0x23/0x60 [btrfs]\n  [32.1621]  __iterate_supers+0xe8/0x190\n  [32.1622]  ? __pfx_sync_fs_one_sb+0x10/0x10\n  [32.1623]  ksys_sync+0x63/0xb0\n  [32.1624]  __do_sys_sync+0xe/0x20\n  [32.1625]  do_syscall_64+0x73/0x450\n  [32.1626]  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n  [32.1627] RIP: 0033:0x7f0c28d05d2b\n  [32.1632] RSP: 002b:00007ffc9d988048 EFLAGS: 00000246 ORIG_RAX:00000000000000a2\n  [32.1634] RAX: ffffffffffffffda RBX: 00007ffc9d988228 RCX:00007f0c28d05d2b\n  [32.1636] RDX: 00007f0c28e02301 RSI: 00007ffc9d989b21 RDI:00007f0c28dba90d\n  [32.1637] RBP: 0000000000000001 R08: 0000000000000001 R09:0000000000000000\n  [32.1639] R10: 0000000000000000 R11: 0000000000000246 R12:000055b96572cb80\n  [32.1641] R13: 000055b96572b19f R14: 00007f0c28dfa434 R15:000055b96572b034\n  [32.1643]  \u003c/TASK\u003e\n  [32.1644] irq event stamp: 0\n  [32.1644] hardirqs last  enabled at (0): [\u003c0000000000000000\u003e] 0x0\n  [32.1646] hardirqs last disabled at (0): [\u003cffffffff81298817\u003e]copy_process+0xb37/0x2260\n  [32.1648] softirqs last  enabled at (0): [\u003cffffffff81298817\u003e]copy_process+0xb37/0x2260\n  [32.1650] softirqs last disabled at (0): [\u003c0000000000000000\u003e] 0x0\n  [32.1652] ---[ end trace 0000000000000000 ]---\n\nFurthermore, this list corruption eventually (when we happen to add a\nnew block group) results in getting the switch_commits and\ndirty_cowonly_roots lists mixed up and attempting to call update_root\non the tree root which can't be found in the tree root, resulting in a\ntransaction abort:\n\n  [87.8269] BTRFS critical (device nvme1n1): unable to find root key (1 0 0) in tree 1\n  [87.8272] ------------[ cut here ]------------\n  [87.8274] BTRFS: Transaction aborted (error -117)\n  [87.8275] WARNING: fs/btrfs/root-tree.c:153 at 0x0, CPU#4: sync/703\n  [87.8285] CPU: 4 UID: 0 PID: 703 Comm: sync Not tainted 6.18.0 #25 PREEMPT(none)\n  [87.8287] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-4.fc41 0\n---truncated---","modified":"2026-07-08T08:13:41.693732852Z","published":"2026-06-03T15:49:47.684Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46251.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/201091da34c4f113af6b4a7407091c39bf29d4ca"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3a1f4264daed4b419c325a7fe35e756cada3cf82"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4eb830847d84276f1c8ea46541cfeeedaba1fb63"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6e10283b5519d987d880d71bec90cdc7f2ec62b3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/80e1fda9c084dcf54819a12bc7682ec0afd2d8f4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e3d1fd084319f8f0830b22f014c7af6a96b4497b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46251.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46251"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"14033b08a02916e85ffc5397e4ac15337359f3ae"},{"fixed":"6e10283b5519d987d880d71bec90cdc7f2ec62b3"},{"fixed":"e3d1fd084319f8f0830b22f014c7af6a96b4497b"},{"fixed":"4eb830847d84276f1c8ea46541cfeeedaba1fb63"},{"fixed":"80e1fda9c084dcf54819a12bc7682ec0afd2d8f4"},{"fixed":"201091da34c4f113af6b4a7407091c39bf29d4ca"},{"fixed":"3a1f4264daed4b419c325a7fe35e756cada3cf82"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"dabf41db56f378a360ff0219c467f8dfecda7dd6"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.0.19"},{"fixed":"6.1"}]}],"versions":["v6.0.18","v6.0.17","v6.0.16","v6.0.15","v6.0.14","v6.0.13","v6.0.12","v6.0.11","v6.0.10","v6.0.9","v6.0.8","v6.0.7","v6.0.6","v6.0.5","v6.0-rc1","v6.0.4","v6.0.3","v6.0.2","v6.0","v6.0.1","v6.0-rc7","v6.0-rc3","v6.0-rc2","v6.0-rc6","v6.0-rc4","v6.0-rc5","v5.19","v5.19-rc1","v5.19-rc5","v5.19-rc8","v5.19-rc6","v5.18","v5.19-rc2","v5.19-rc7","v5.19-rc3","v5.19-rc4","v5.18-rc1","v5.18-rc7","v5.18-rc2","v5.18-rc5","v5.17","v5.18-rc4","v5.18-rc3","v5.18-rc6","v5.17-rc6","v5.17-rc4","v5.17-rc8","v5.17-rc7","v5.17-rc1","v5.17-rc3","v5.17-rc2","v5.17-rc5","v5.16","v5.16-rc1","v5.16-rc8","v5.16-rc5","v5.16-rc6","v5.16-rc7","v5.16-rc3","v5.16-rc2","v5.16-rc4","v5.15","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","v5.4-rc3","v5.4-rc4","v5.4-rc8","v5.4-rc7","v5.4-rc5","v5.3","v5.4-rc2","v5.3-rc5","v5.3-rc1","v5.3-rc2","v5.3-rc3","v5.3-rc8","v5.3-rc7","v5.3-rc4","v5.2","v5.3-rc6","v5.2-rc2","v5.2-rc7","v5.2-rc4","v5.2-rc1","v5.2-rc5","v5.2-rc6","v5.2-rc3","v5.1","v5.0-rc8","v5.1-rc7","v5.1-rc1","v5.1-rc6","v5.1-rc5","v5.0","v5.1-rc3","v5.1-rc2","v5.1-rc4","v5.0-rc1","v5.0-rc4","v5.0-rc3","v5.0-rc6","v5.0-rc7","v5.0-rc2","v5.0-rc5","v4.20-rc1","v4.19","v4.20","v4.20-rc7","v4.20-rc5","v4.20-rc6","v4.20-rc4","v4.20-rc2","v4.20-rc3","v4.19-rc2","v4.19-rc8","v4.19-rc4","v4.19-rc1","v4.19-rc7","v4.19-rc6","v4.19-rc5","v4.19-rc3","v4.18","v4.18-rc1","v4.18-rc8","v4.18-rc2","v4.18-rc5","v4.18-rc6","v4.18-rc7","v4.17","v4.18-rc3","v4.18-rc4","v4.17-rc1","v4.17-rc2","v4.17-rc7","v4.17-rc3","v4.17-rc4","v4.16","v4.17-rc6","v4.17-rc5","v4.16-rc7","v4.16-rc4","v4.16-rc1","v4.16-rc2","v4.16-rc5","v4.16-rc3","v4.16-rc6","v4.14","v4.15","v4.15-rc1","v4.15-rc4","v4.15-rc9","v4.15-rc8","v4.15-rc7","v4.15-rc3","v4.15-rc2","v4.15-rc5","v4.15-rc6","v4.14-rc1","v4.14-rc7","v4.14-rc3","v4.13","v4.14-rc8","v4.14-rc4","v4.14-rc6","v4.14-rc2","v4.14-rc5","v4.13-rc2","v4.13-rc1","v4.13-rc3","v4.13-rc7","v4.13-rc4","v4.13-rc5","v4.13-rc6","v4.12-rc1","v4.12","v4.12-rc5","v4.12-rc7","v4.12-rc6","v4.12-rc4","v4.12-rc2","v4.12-rc3","v4.11","v4.11-rc1","v4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