CVE-2026-46251 (GCVE-0-2026-46251)
Vulnerability from cvelistv5 – Published: 2026-06-03 15:49 – Updated: 2026-06-03 15:49
VLAI
Title
btrfs: fix block_group_tree dirty_list corruption
Summary
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->dirty_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->prev 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 + ICH9, 2009), BIOS1.17.0-4.fc41 04/01/2014
[32.1587] RIP: 0010:__list_del_entry_valid_or_report+0x108/0x120
[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] <TASK>
[32.1611] switch_commit_roots+0x82/0x1d0 [btrfs]
[32.1615] btrfs_commit_transaction+0x968/0x1550 [btrfs]
[32.1618] ? btrfs_attach_transaction_barrier+0x23/0x60 [btrfs]
[32.1621] __iterate_supers+0xe8/0x190
[32.1622] ? __pfx_sync_fs_one_sb+0x10/0x10
[32.1623] ksys_sync+0x63/0xb0
[32.1624] __do_sys_sync+0xe/0x20
[32.1625] do_syscall_64+0x73/0x450
[32.1626] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[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] </TASK>
[32.1644] irq event stamp: 0
[32.1644] hardirqs last enabled at (0): [<0000000000000000>] 0x0
[32.1646] hardirqs last disabled at (0): [<ffffffff81298817>]copy_process+0xb37/0x2260
[32.1648] softirqs last enabled at (0): [<ffffffff81298817>]copy_process+0xb37/0x2260
[32.1650] softirqs last disabled at (0): [<0000000000000000>] 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't 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 + ICH9, 2009), BIOS 1.17.0-4.fc41 0
---truncated---
Severity
No CVSS data available.
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
14033b08a02916e85ffc5397e4ac15337359f3ae , < 6e10283b5519d987d880d71bec90cdc7f2ec62b3
(git)
Affected: 14033b08a02916e85ffc5397e4ac15337359f3ae , < e3d1fd084319f8f0830b22f014c7af6a96b4497b (git) Affected: 14033b08a02916e85ffc5397e4ac15337359f3ae , < 4eb830847d84276f1c8ea46541cfeeedaba1fb63 (git) Affected: 14033b08a02916e85ffc5397e4ac15337359f3ae , < 80e1fda9c084dcf54819a12bc7682ec0afd2d8f4 (git) Affected: 14033b08a02916e85ffc5397e4ac15337359f3ae , < 201091da34c4f113af6b4a7407091c39bf29d4ca (git) Affected: 14033b08a02916e85ffc5397e4ac15337359f3ae , < 3a1f4264daed4b419c325a7fe35e756cada3cf82 (git) Affected: dabf41db56f378a360ff0219c467f8dfecda7dd6 (git) Affected: 6.0.19 , < 6.1 (semver) |
|
| Linux | Linux |
Affected:
6.1
Unaffected: 0 , < 6.1 (semver) Unaffected: 6.1.165 , ≤ 6.1.* (semver) Unaffected: 6.6.128 , ≤ 6.6.* (semver) Unaffected: 6.12.75 , ≤ 6.12.* (semver) Unaffected: 6.18.14 , ≤ 6.18.* (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
{
"containers": {
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{
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"programFiles": [
"fs/btrfs/transaction.c"
],
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{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.75",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.18.14",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.19.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"descriptions": [
{
"lang": "en",
"value": "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\u0027t 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---"
}
],
"providerMetadata": {
"dateUpdated": "2026-06-03T15:49:47.684Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/6e10283b5519d987d880d71bec90cdc7f2ec62b3"
},
{
"url": "https://git.kernel.org/stable/c/e3d1fd084319f8f0830b22f014c7af6a96b4497b"
},
{
"url": "https://git.kernel.org/stable/c/4eb830847d84276f1c8ea46541cfeeedaba1fb63"
},
{
"url": "https://git.kernel.org/stable/c/80e1fda9c084dcf54819a12bc7682ec0afd2d8f4"
},
{
"url": "https://git.kernel.org/stable/c/201091da34c4f113af6b4a7407091c39bf29d4ca"
},
{
"url": "https://git.kernel.org/stable/c/3a1f4264daed4b419c325a7fe35e756cada3cf82"
}
],
"title": "btrfs: fix block_group_tree dirty_list corruption",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-46251",
"datePublished": "2026-06-03T15:49:47.684Z",
"dateReserved": "2026-05-13T15:03:33.107Z",
"dateUpdated": "2026-06-03T15:49:47.684Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-46251\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-03T18:16:25.603\",\"lastModified\":\"2026-06-03T18:16:25.603\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\u0027t 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---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/201091da34c4f113af6b4a7407091c39bf29d4ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3a1f4264daed4b419c325a7fe35e756cada3cf82\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4eb830847d84276f1c8ea46541cfeeedaba1fb63\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6e10283b5519d987d880d71bec90cdc7f2ec62b3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/80e1fda9c084dcf54819a12bc7682ec0afd2d8f4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e3d1fd084319f8f0830b22f014c7af6a96b4497b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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