CVE-2025-71194
Estado: AplazadaSin puntuar—
In the Linux kernel, the following vulnerability has been resolved:
btrfs: fix deadlock in wait_current_trans() due to ignored transaction type
When wait_current_trans() is called during start_transaction(), it currently waits for a blocked transaction without considering whether the given transaction type actually needs to wait for that particular transaction state. The btrfs_blocked_trans_types[] array already defines which transaction types should wait for which transaction states, but this check was missing in wait_current_trans().
This can lead to a deadlock scenario involving two transactions and pending ordered extents:
Leer descripción completaMostrar menos
Task bstore_kv_sync in btrfs_commit_transaction waiting for ordered extents:
Task kworker in wait_current_trans waiting for transaction commit:
Fix this by passing the transaction type to wait_current_trans() and checking btrfs_blocked_trans_types[cur_trans->state] against the given type before deciding to wait. This ensures that transaction types which are allowed to join during certain blocked states will not unnecessarily wait and cause deadlocks.
Detalles técnicos trazas, registros y código del informe original
1. Transaction A is in TRANS_STATE_COMMIT_DOING state
2. A worker processing an ordered extent calls start_transaction()
with TRANS_JOIN
3. join_transaction() returns -EBUSY because Transaction A is in
TRANS_STATE_COMMIT_DOING
4. Transaction A moves to TRANS_STATE_UNBLOCKED and completes
5. A new Transaction B is created (TRANS_STATE_RUNNING)
6. The ordered extent from step 2 is added to Transaction B's
pending ordered extents
7. Transaction B immediately starts commit by another task and
enters TRANS_STATE_COMMIT_START
8. The worker finally reaches wait_current_trans(), sees Transaction B
in TRANS_STATE_COMMIT_START (a blocked state), and waits
unconditionally
9. However, TRANS_JOIN should NOT wait for TRANS_STATE_COMMIT_START
according to btrfs_blocked_trans_types[]
10. Transaction B is waiting for pending ordered extents to complete
11. Deadlock: Transaction B waits for ordered extent, ordered extent
waits for Transaction B
This can be illustrated by the following call stacks:
CPU0 CPU1
btrfs_finish_ordered_io()
start_transaction(TRANS_JOIN)
join_transaction()
# -EBUSY (Transaction A is
# TRANS_STATE_COMMIT_DOING)
# Transaction A completes
# Transaction B created
# ordered extent added to
# Transaction B's pending list
btrfs_commit_transaction()
# Transaction B enters
# TRANS_STATE_COMMIT_START
# waiting for pending ordered
# extents
wait_current_trans()
# waits for Transaction B
# (should not wait!)
__schedule+0x2e7/0x8a0
schedule+0x64/0xe0
btrfs_commit_transaction+0xbf7/0xda0 [btrfs]
btrfs_sync_file+0x342/0x4d0 [btrfs]
__x64_sys_fdatasync+0x4b/0x80
do_syscall_64+0x33/0x40
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Workqueue: btrfs-syno_nocow btrfs_work_helper [btrfs]
__schedule+0x2e7/0x8a0
schedule+0x64/0xe0
wait_current_trans+0xb0/0x110 [btrfs]
start_transaction+0x346/0x5b0 [btrfs]
btrfs_finish_ordered_io.isra.0+0x49b/0x9c0 [btrfs]
btrfs_work_helper+0xe8/0x350 [btrfs]
process_one_work+0x1d3/0x3c0
worker_thread+0x4d/0x3e0
kthread+0x12d/0x150
ret_from_fork+0x1f/0x30CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.20%
- Percentil entre todas las CVEs puntuadas: 9
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/5037b342825df7094a4906d1e2a9674baab50cb2
- https://git.kernel.org/stable/c/8b0bb145d3bc264360f525c9717653be3522e528
- https://git.kernel.org/stable/c/99da896614d17e8a84aeb2b2d464ac046cc8633d
- https://git.kernel.org/stable/c/9ac63333d600732a56b35ee1fa46836da671eb50
- https://git.kernel.org/stable/c/d7b04b40ac8e6d814e35202a0e1568809b818295
- https://git.kernel.org/stable/c/dc84036c173cff6a432d9ab926298850b1d2a659
- https://git.kernel.org/stable/c/e563f59395981fcd69d130761290929806e728d6
JSON original (NVD)
Mostrar
{
"id": "CVE-2025-71194",
"cveTags": [],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2025-71194",
"role": "CISA Coordinator",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2026-06-16T16:18:56.240141Z"
}
}
]
},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4a9d8bdee368de78ace8b36da4eb2186afea162d",
"lessThan": "e563f59395981fcd69d130761290929806e728d6",
"versionType": "git"
},
{
"status": "affected",
"version": "4a9d8bdee368de78ace8b36da4eb2186afea162d",
"lessThan": "dc84036c173cff6a432d9ab926298850b1d2a659",
"versionType": "git"
},
{
"status": "affected",
"version": "4a9d8bdee368de78ace8b36da4eb2186afea162d",
"lessThan": "d7b04b40ac8e6d814e35202a0e1568809b818295",
"versionType": "git"
},
{
"status": "affected",
"version": "4a9d8bdee368de78ace8b36da4eb2186afea162d",
"lessThan": "99da896614d17e8a84aeb2b2d464ac046cc8633d",
"versionType": "git"
},
{
"status": "affected",
"version": "4a9d8bdee368de78ace8b36da4eb2186afea162d",
"lessThan": "8b0bb145d3bc264360f525c9717653be3522e528",
"versionType": "git"
},
{
"status": "affected",
"version": "4a9d8bdee368de78ace8b36da4eb2186afea162d",
"lessThan": "9ac63333d600732a56b35ee1fa46836da671eb50",
"versionType": "git"
},
{
"status": "affected",
"version": "4a9d8bdee368de78ace8b36da4eb2186afea162d",
"lessThan": "5037b342825df7094a4906d1e2a9674baab50cb2",
"versionType": "git"
}
],
"programFiles": [
"fs/btrfs/transaction.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.249",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.199",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.162",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.122",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.67",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.7",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/btrfs/transaction.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-02-04T17:16:11.297",
"references": [
{
"url": "https://git.kernel.org/stable/c/5037b342825df7094a4906d1e2a9674baab50cb2",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8b0bb145d3bc264360f525c9717653be3522e528",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/99da896614d17e8a84aeb2b2d464ac046cc8633d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9ac63333d600732a56b35ee1fa46836da671eb50",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d7b04b40ac8e6d814e35202a0e1568809b818295",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/dc84036c173cff6a432d9ab926298850b1d2a659",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e563f59395981fcd69d130761290929806e728d6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix deadlock in wait_current_trans() due to ignored transaction type\n\nWhen wait_current_trans() is called during start_transaction(), it\ncurrently waits for a blocked transaction without considering whether\nthe given transaction type actually needs to wait for that particular\ntransaction state. The btrfs_blocked_trans_types[] array already defines\nwhich transaction types should wait for which transaction states, but\nthis check was missing in wait_current_trans().\n\nThis can lead to a deadlock scenario involving two transactions and\npending ordered extents:\n\n 1. Transaction A is in TRANS_STATE_COMMIT_DOING state\n\n 2. A worker processing an ordered extent calls start_transaction()\n with TRANS_JOIN\n\n 3. join_transaction() returns -EBUSY because Transaction A is in\n TRANS_STATE_COMMIT_DOING\n\n 4. Transaction A moves to TRANS_STATE_UNBLOCKED and completes\n\n 5. A new Transaction B is created (TRANS_STATE_RUNNING)\n\n 6. The ordered extent from step 2 is added to Transaction B's\n pending ordered extents\n\n 7. Transaction B immediately starts commit by another task and\n enters TRANS_STATE_COMMIT_START\n\n 8. The worker finally reaches wait_current_trans(), sees Transaction B\n in TRANS_STATE_COMMIT_START (a blocked state), and waits\n unconditionally\n\n 9. However, TRANS_JOIN should NOT wait for TRANS_STATE_COMMIT_START\n according to btrfs_blocked_trans_types[]\n\n 10. Transaction B is waiting for pending ordered extents to complete\n\n 11. Deadlock: Transaction B waits for ordered extent, ordered extent\n waits for Transaction B\n\nThis can be illustrated by the following call stacks:\n CPU0 CPU1\n btrfs_finish_ordered_io()\n start_transaction(TRANS_JOIN)\n join_transaction()\n # -EBUSY (Transaction A is\n # TRANS_STATE_COMMIT_DOING)\n # Transaction A completes\n # Transaction B created\n # ordered extent added to\n # Transaction B's pending list\n btrfs_commit_transaction()\n # Transaction B enters\n # TRANS_STATE_COMMIT_START\n # waiting for pending ordered\n # extents\n wait_current_trans()\n # waits for Transaction B\n # (should not wait!)\n\nTask bstore_kv_sync in btrfs_commit_transaction waiting for ordered\nextents:\n\n __schedule+0x2e7/0x8a0\n schedule+0x64/0xe0\n btrfs_commit_transaction+0xbf7/0xda0 [btrfs]\n btrfs_sync_file+0x342/0x4d0 [btrfs]\n __x64_sys_fdatasync+0x4b/0x80\n do_syscall_64+0x33/0x40\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\nTask kworker in wait_current_trans waiting for transaction commit:\n\n Workqueue: btrfs-syno_nocow btrfs_work_helper [btrfs]\n __schedule+0x2e7/0x8a0\n schedule+0x64/0xe0\n wait_current_trans+0xb0/0x110 [btrfs]\n start_transaction+0x346/0x5b0 [btrfs]\n btrfs_finish_ordered_io.isra.0+0x49b/0x9c0 [btrfs]\n btrfs_work_helper+0xe8/0x350 [btrfs]\n process_one_work+0x1d3/0x3c0\n worker_thread+0x4d/0x3e0\n kthread+0x12d/0x150\n ret_from_fork+0x1f/0x30\n\nFix this by passing the transaction type to wait_current_trans() and\nchecking btrfs_blocked_trans_types[cur_trans->state] against the given\ntype before deciding to wait. This ensures that transaction types which\nare allowed to join during certain blocked states will not unnecessarily\nwait and cause deadlocks."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbtrfs: corrige interbloqueo en wait_current_trans() debido a un tipo de transacción ignorado\n\nCuando se llama a wait_current_trans() durante start_transaction(), actualmente espera por una transacción bloqueada sin considerar si el tipo de transacción dado realmente necesita esperar por ese estado de transacción particular. El array btrfs_blocked_trans_types[] ya define qué tipos de transacción deben esperar por qué estados de transacción, pero esta verificación faltaba en wait_current_trans().\n\nEsto puede llevar a un escenario de interbloqueo que involucra dos transacciones y extensiones ordenadas pendientes:\n\n 1. La Transacción A está en estado TRANS_STATE_COMMIT_DOING\n 2. Un worker que procesa una extensión ordenada llama a start_transaction() con TRANS_JOIN\n 3. join_transaction() devuelve -EBUSY porque la Transacción A está en TRANS_STATE_COMMIT_DOING\n 4. La Transacción A pasa a TRANS_STATE_UNBLOCKED y se completa\n 5. Se crea una nueva Transacción B (TRANS_STATE_RUNNING)\n 6. La extensión ordenada del paso 2 se añade a las extensiones ordenadas pendientes de la Transacción B\n 7. La Transacción B inicia inmediatamente la confirmación por otra tarea y entra en TRANS_STATE_COMMIT_START\n 8. El worker finalmente llega a wait_current_trans(), ve la Transacción B en TRANS_STATE_COMMIT_START (un estado bloqueado), y espera incondicionalmente\n 9. Sin embargo, TRANS_JOIN NO debería esperar por TRANS_STATE_COMMIT_START según btrfs_blocked_trans_types[]\n 10. La Transacción B está esperando que las extensiones ordenadas pendientes se completen\n 11. Interbloqueo: La Transacción B espera por la extensión ordenada, la extensión ordenada espera por la Transacción B\n\nEsto puede ilustrarse con las siguientes pilas de llamadas:\n CPU0 CPU1\n btrfs_finish_ordered_io()\n start_transaction(TRANS_JOIN)\n join_transaction()\n # -EBUSY (La Transacción A está en\n # TRANS_STATE_COMMIT_DOING)\n # La Transacción A se completa\n # La Transacción B creada\n # extensión ordenada añadida a\n # la lista pendiente de la Transacción B\n btrfs_commit_transaction()\n # La Transacción B entra en\n # TRANS_STATE_COMMIT_START\n # esperando por extensiones ordenadas\n # pendientes\n wait_current_trans()\n # espera por la Transacción B\n # (¡no debería esperar!)\n\nTarea bstore_kv_sync en btrfs_commit_transaction esperando por extensiones ordenadas:\n\n __schedule+0x2e7/0x8a0\n schedule+0x64/0xe0\n btrfs_commit_transaction+0xbf7/0xda0 [btrfs]\n btrfs_sync_file+0x342/0x4d0 [btrfs]\n __x64_sys_fdatasync+0x4b/0x80\n do_syscall_64+0x33/0x40\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\nTarea kworker en wait_current_trans esperando por la confirmación de la transacción:\n\n Cola de trabajo: btrfs-syno_nocow btrfs_work_helper [btrfs]\n __schedule+0x2e7/0x8a0\n schedule+0x64/0xe0\n wait_current_trans+0xb0/0x110 [btrfs]\n start_transaction+0x346/0x5b0 [btrfs]\n btrfs_finish_ordered_io.isra.0+0x49b/0x9c0 [btrfs]\n btrfs_work_helper+0xe8/0x350 [btrfs]\n process_one_work+0x1d3/0x3c0\n worker_thread+0x4d/0x3e0\n kthread+0x12d/0x150\n ret_from_fork+0x1f/0x30\n\nSolucione esto pasando el tipo de transacción a wait_current_trans() y verificando btrfs_blocked_trans_types[cur_trans->state] contra el tipo dado antes de decidir esperar. Esto asegura que los tipos de transacción a los que se les permite unirse durante ciertos estados bloqueados no esperarán innecesariamente y causarán interbloqueos."
}
],
"lastModified": "2026-06-17T10:03:51.790",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}