CVE-2025-40090
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix recursive locking in RPC handle list access Since commit 305853cce3794 ("ksmbd: Fix race condition in RPC handle list access"), ksmbd_session_rpc_method() attempts to lock sess->rpc_lock. This causes hung connections / tasks when a client attempts to open a named pipe. Using Samba's rpcclient tool: $ rpcclient //192.168.1.254 -U user%password $ rpcclient $> srvinfo <connection hung here> Kernel side: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:0 state:D stack:0 pid:5021 tgid:5021 ppid:2 flags:0x00200000 Workqueue: ksmbd-io handle_ksmbd_work Call trace: __schedule from schedule+0x3c/0x58 schedule from schedule_preempt_disabled+0xc/0x10 schedule_preempt_disabled from rwsem_down_read_slowpath+0x1b0/0x1d8 rwsem_down_read_slowpath from down_read+0x28/0x30 down_read from ksmbd_session_rpc_method+0x18/0x3c ksmbd_session_rpc_method from ksmbd_rpc_open+0x34/0x68 ksmbd_rpc_open from ksmbd_session_rpc_open+0x194/0x228 ksmbd_session_rpc_open from create_smb2_pipe+0x8c/0x2c8 create_smb2_pipe from smb2_open+0x10c/0x27ac smb2_open from handle_ksmbd_work+0x238/0x3dc handle_ksmbd_work from process_scheduled_works+0x160/0x25c process_scheduled_works from worker_thread+0x16c/0x1e8 worker_thread from kthread+0xa8/0xb8 kthread from ret_from_fork+0x14/0x38 Exception stack(0x8529ffb0 to 0x8529fff8) The task deadlocks because the lock is already held: ksmbd_session_rpc_open down_write(&sess->rpc_lock) ksmbd_rpc_open ksmbd_session_rpc_method down_read(&sess->rpc_lock) <-- deadlock Adjust ksmbd_session_rpc_method() callers to take the lock when necessary.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-10-30 10:15:33.537000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON
{
"id": "CVE-2025-40090",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-10-30T10:15:33.537",
"lastModified": "2026-10-19T21:10:00.160",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix recursive locking in RPC handle list access\n\nSince commit 305853cce3794 (\"ksmbd: Fix race condition in RPC handle list\naccess\"), ksmbd_session_rpc_method() attempts to lock sess->rpc_lock.\n\nThis causes hung connections / tasks when a client attempts to open\na named pipe. Using Samba's rpcclient tool:\n\n $ rpcclient //192.168.1.254 -U user%password\n $ rpcclient $> srvinfo\n <connection hung here>\n\nKernel side:\n \"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n task:kworker/0:0 state:D stack:0 pid:5021 tgid:5021 ppid:2 flags:0x00200000\n Workqueue: ksmbd-io handle_ksmbd_work\n Call trace:\n __schedule from schedule+0x3c/0x58\n schedule from schedule_preempt_disabled+0xc/0x10\n schedule_preempt_disabled from rwsem_down_read_slowpath+0x1b0/0x1d8\n rwsem_down_read_slowpath from down_read+0x28/0x30\n down_read from ksmbd_session_rpc_method+0x18/0x3c\n ksmbd_session_rpc_method from ksmbd_rpc_open+0x34/0x68\n ksmbd_rpc_open from ksmbd_session_rpc_open+0x194/0x228\n ksmbd_session_rpc_open from create_smb2_pipe+0x8c/0x2c8\n create_smb2_pipe from smb2_open+0x10c/0x27ac\n smb2_open from handle_ksmbd_work+0x238/0x3dc\n handle_ksmbd_work from process_scheduled_works+0x160/0x25c\n process_scheduled_works from worker_thread+0x16c/0x1e8\n worker_thread from kthread+0xa8/0xb8\n kthread from ret_from_fork+0x14/0x38\n Exception stack(0x8529ffb0 to 0x8529fff8)\n\nThe task deadlocks because the lock is already held:\n ksmbd_session_rpc_open\n down_write(&sess->rpc_lock)\n ksmbd_rpc_open\n ksmbd_session_rpc_method\n down_read(&sess->rpc_lock) <-- deadlock\n\nAdjust ksmbd_session_rpc_method() callers to take the lock when necessary."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nksmbd: corrige el bloqueo recursivo en el acceso a la lista de manejadores RPC\n\nDesde el commit 305853cce3792 ('ksmbd: Corrige la condición de carrera en el acceso a la lista de manejadores RPC'), ksmbd_session_rpc_method() intenta bloquear sess->rpc_lock.\n\nEsto causa conexiones / tareas colgadas cuando un cliente intenta abrir una tubería con nombre. Usando la herramienta rpcclient de Samba:\n\n $ rpcclient //192.168.1.254 -U user%password\n $ rpcclient $> srvinfo\n <conexión colgada aquí>\n\nLado del kernel:\n 'echo 0 > /proc/sys/kernel/hung_task_timeout_secs' deshabilita este mensaje.\n tarea:kworker/0:0 estado:D pila:0 pid:5021 tgid:5021 ppid:2 flags:0x00200000\n Cola de trabajo: ksmbd-io handle_ksmbd_work\n Traza de llamada:\n __schedule desde schedule+0x3c/0x58\n schedule desde schedule_preempt_disabled+0xc/0x10\n schedule_preempt_disabled desde rwsem_down_read_slowpath+0x1b0/0x1d8\n rwsem_down_read_slowpath desde down_read+0x28/0x30\n down_read desde ksmbd_session_rpc_method+0x18/0x3c\n ksmbd_session_rpc_method desde ksmbd_rpc_open+0x34/0x68\n ksmbd_rpc_open desde ksmbd_session_rpc_open+0x194/0x228\n ksmbd_session_rpc_open desde create_smb2_pipe+0x8c/0x2c8\n create_smb2_pipe desde smb2_open+0x10c/0x27ac\n smb2_open desde handle_ksmbd_work+0x238/0x3dc\n handle_ksmbd_work desde process_scheduled_works+0x160/0x25c\n process_scheduled_works desde worker_thread+0x16c/0x1e8\n worker_thread desde kthread+0xa8/0xb8\n kthread desde ret_from_fork+0x14/0x38\n Pila de excepción(0x8529ffb0 a 0x8529fff8)\n\nLa tarea se interbloquea porque el bloqueo ya está retenido:\n ksmbd_session_rpc_open\n down_write(&sess->rpc_lock)\n ksmbd_rpc_open\n ksmbd_session_rpc_method\n down_read(&sess->rpc_lock) <-- interbloqueo\n\nAjustar los llamadores de ksmbd_session_rpc_method() para tomar el bloqueo cuando sea necesario."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"fs/smb/server/mgmt/user_session.c",
"fs/smb/server/smb2pdu.c",
"fs/smb/server/transport_ipc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "69674b029002b1d90b655f014bdf64f404efa54d",
"lessThan": "5493571f4351f74e11db9943e98a07c56467cf7e",
"versionType": "git",
"status": "affected"
},
{
"version": "6b615a8fb3af0baf8126cde3d4fee97d57222ffc",
"lessThan": "1891abe832cbf5a11039e088766131d0f1642d02",
"versionType": "git",
"status": "affected"
},
{
"version": "5cc679ba0f4505936124cd4179ba66bb0a4bd9f3",
"lessThan": "4602b8cee1481dbb896182e5cb1e8cf12910e9e7",
"versionType": "git",
"status": "affected"
},
{
"version": "6bd7e0e55dcea2cf0d391bbc21c2eb069b4be3e1",
"lessThan": "3412fbd81b46b9cfae013817b61d4bbd27e09e36",
"versionType": "git",
"status": "affected"
},
{
"version": "305853cce379407090a73b38c5de5ba748893aee",
"lessThan": "88f170814fea74911ceab798a43cbd7c5599bed4",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"fs/smb/server/mgmt/user_session.c",
"fs/smb/server/smb2pdu.c",
"fs/smb/server/transport_ipc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.12.53",
"lessThan": "6.12.55",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.17.3",
"lessThan": "6.17.5",
"versionType": "semver",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6
},
{
"source": "[email protected]",
"type": "Primary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-674"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.12.53",
"versionEndExcluding": "6.12.55",
"matchCriteriaId": "E4EB1667-C055-4880-911F-BD74B6375984"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.17.3",
"versionEndExcluding": "6.17.5",
"matchCriteriaId": "99358CF3-A8B9-4638-A2ED-6200D3371019"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:6.18:rc1:*:*:*:*:*:*",
"matchCriteriaId": "DD01661D-DFC8-4B6D-80E7-46D203CC4565"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/1891abe832cbf5a11039e088766131d0f1642d02",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/3412fbd81b46b9cfae013817b61d4bbd27e09e36",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/4602b8cee1481dbb896182e5cb1e8cf12910e9e7",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/5493571f4351f74e11db9943e98a07c56467cf7e",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/88f170814fea74911ceab798a43cbd7c5599bed4",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
}
]
}