{
  "cveId": "CVE-2026-46251",
  "url": "https://patchblox.com/security/cve/CVE-2026-46251",
  "summary": "CVE-2026-46251 is fixed in 67 products on 1 platform, first by ALAS2023-2026-1514, released March 30, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  btrfs: fix block_group_tree dirty_list corruptio...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  btrfs: fix block_group_tree dirty_list corruption  When the incompat flag EXTENT_TREE_V2 is set, we unconditionally add the block group tree to the switch_commits list before calling switch_commit_roots, as we do for the tree root and the chunk root. However, the block group tree uses normal root dirty tracking and in any transaction that does an allocation and dirties a block group, the block group root will already be linked to a list by the dirty_list field and this use of list_add_tail() is invalid and corrupts the prev/next members of block_group_root-\u003Edirty_list.  This is apparent on a subsequent list_del on the prev if we enable CONFIG_DEBUG_LIST:    [32.1571] ------------[ cut here ]------------   [32.1572] list_del corruption. next-\u003Eprev should beffff958890202538, but was ffff9588992bd538. (next=ffff958890201538)   [32.1575] WARNING: lib/list_debug.c:65 at 0x0, CPU#3: sync/607   [32.1583] CPU: 3 UID: 0 PID: 607 Comm: sync Not tainted 6.18.0 #24PREEMPT(none)   [32.1585] Hardware name: QEMU Standard PC (Q35 \u002B ICH9, 2009), BIOS1.17.0-4.fc41 04/01/2014   [32.1587] RIP: 0010:__list_del_entry_valid_or_report\u002B0x108/0x120   [32.1593] RSP: 0018:ffffaa288287fdd0 EFLAGS: 00010202   [32.1594] RAX: 0000000000000001 RBX: ffff95889326e800 RCX:ffff958890201538   [32.1596] RDX: ffff9588992bd538 RSI: ffff958890202538 RDI:ffffffff82a41e00   [32.1597] RBP: ffff958890202538 R08: ffffffff828fc1e8 R09:00000000ffffefff   [32.1599] R10: ffffffff8288c200 R11: ffffffff828e4200 R12:ffff958890201538   [32.1601] R13: ffff95889326e958 R14: ffff958895c24000 R15:ffff958890202538   [32.1603] FS:  00007f0c28eb5740(0000) GS:ffff958af2bd2000(0000)knlGS:0000000000000000   [32.1605] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033   [32.1607] CR2: 00007f0c28e8a3cc CR3: 0000000109942005 CR4:0000000000370ef0   [32.1609] Call Trace:   [32.1610]  \u003CTASK\u003E   [32.1611]  switch_commit_roots\u002B0x82/0x1d0 [btrfs]   [32.1615]  btrfs_commit_transaction\u002B0x968/0x1550 [btrfs]   [32.1618]  ? btrfs_attach_transaction_barrier\u002B0x23/0x60 [btrfs]   [32.1621]  __iterate_supers\u002B0xe8/0x190   [32.1622]  ? __pfx_sync_fs_one_sb\u002B0x10/0x10   [32.1623]  ksys_sync\u002B0x63/0xb0   [32.1624]  __do_sys_sync\u002B0xe/0x20   [32.1625]  do_syscall_64\u002B0x73/0x450   [32.1626]  entry_SYSCALL_64_after_hwframe\u002B0x76/0x7e   [32.1627] RIP: 0033:0x7f0c28d05d2b   [32.1632] RSP: 002b:00007ffc9d988048 EFLAGS: 00000246 ORIG_RAX:00000000000000a2   [32.1634] RAX: ffffffffffffffda RBX: 00007ffc9d988228 RCX:00007f0c28d05d2b   [32.1636] RDX: 00007f0c28e02301 RSI: 00007ffc9d989b21 RDI:00007f0c28dba90d   [32.1637] RBP: 0000000000000001 R08: 0000000000000001 R09:0000000000000000   [32.1639] R10: 0000000000000000 R11: 0000000000000246 R12:000055b96572cb80   [32.1641] R13: 000055b96572b19f R14: 00007f0c28dfa434 R15:000055b96572b034   [32.1643]  \u003C/TASK\u003E   [32.1644] irq event stamp: 0   [32.1644] hardirqs last  enabled at (0): [\u003C0000000000000000\u003E] 0x0   [32.1646] hardirqs last disabled at (0): [\u003Cffffffff81298817\u003E]copy_process\u002B0xb37/0x2260   [32.1648] softirqs last  enabled at (0): [\u003Cffffffff81298817\u003E]copy_process\u002B0xb37/0x2260   [32.1650] softirqs last disabled at (0): [\u003C0000000000000000\u003E] 0x0   [32.1652] ---[ end trace 0000000000000000 ]---  Furthermore, this list corruption eventually (when we happen to add a new block group) results in getting the switch_commits and dirty_cowonly_roots lists mixed up and attempting to call update_root on the tree root which can\u0027t be found in the tree root, resulting in a transaction abort:    [87.8269] BTRFS critical (device nvme1n1): unable to find root key (1 0 0) in tree 1   [87.8272] ------------[ cut here ]------------   [87.8274] BTRFS: Transaction aborted (error -117)   [87.8275] WARNING: fs/btrfs/root-tree.c:153 at 0x0, CPU#4: sync/703   [87.8285] CPU: 4 UID: 0 PID: 703 Comm: sync Not tainted 6.18.0 #25 PREEMPT(none)   [87.8287] Hardware name: QEMU Standard PC (Q35 \u002B ICH9, 2009), BIOS 1.17.0-4.fc41 0 ---truncated---",
  "published": "2026-03-30T09:00:00Z",
  "severity": "high",
  "cvss": 8.4,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00132,
  "epssPercentile": 0.02794,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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