CVE-2025-40090 (GCVE-0-2025-40090)

Vulnerability from cvelistv5 – Published: 2025-10-30 09:47 – Updated: 2026-08-05 12:07
VLAI
Title
ksmbd: fix recursive locking in RPC handle list access
Summary
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
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6994 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 69674b029002b1d90b655f014bdf64f404efa54d , < 5493571f4351f74e11db9943e98a07c56467cf7e (git)
Affected: 6b615a8fb3af0baf8126cde3d4fee97d57222ffc , < 1891abe832cbf5a11039e088766131d0f1642d02 (git)
Affected: 5cc679ba0f4505936124cd4179ba66bb0a4bd9f3 , < 4602b8cee1481dbb896182e5cb1e8cf12910e9e7 (git)
Affected: 6bd7e0e55dcea2cf0d391bbc21c2eb069b4be3e1 , < 3412fbd81b46b9cfae013817b61d4bbd27e09e36 (git)
Affected: 305853cce379407090a73b38c5de5ba748893aee , < 88f170814fea74911ceab798a43cbd7c5599bed4 (git)
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Linux Linux Affected: 6.12.53 , < 6.12.55 (semver)
Affected: 6.17.3 , < 6.17.5 (semver)
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          "product": "Linux",
          "programFiles": [
            "fs/smb/server/mgmt/user_session.c",
            "fs/smb/server/smb2pdu.c",
            "fs/smb/server/transport_ipc.c"
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          "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-\u003erpc_lock.\n\nThis causes hung connections / tasks when a client attempts to open\na named pipe. Using Samba\u0027s rpcclient tool:\n\n $ rpcclient //192.168.1.254 -U user%password\n $ rpcclient $\u003e srvinfo\n \u003cconnection hung here\u003e\n\nKernel side:\n  \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n  task:kworker/0:0 state:D stack:0 pid:5021 tgid:5021 ppid:2 flags:0x00200000\n  Workqueue: ksmbd-io handle_ksmbd_work\n  Call trace:\n  __schedule from schedule+0x3c/0x58\n  schedule from schedule_preempt_disabled+0xc/0x10\n  schedule_preempt_disabled from rwsem_down_read_slowpath+0x1b0/0x1d8\n  rwsem_down_read_slowpath from down_read+0x28/0x30\n  down_read from ksmbd_session_rpc_method+0x18/0x3c\n  ksmbd_session_rpc_method from ksmbd_rpc_open+0x34/0x68\n  ksmbd_rpc_open from ksmbd_session_rpc_open+0x194/0x228\n  ksmbd_session_rpc_open from create_smb2_pipe+0x8c/0x2c8\n  create_smb2_pipe from smb2_open+0x10c/0x27ac\n  smb2_open from handle_ksmbd_work+0x238/0x3dc\n  handle_ksmbd_work from process_scheduled_works+0x160/0x25c\n  process_scheduled_works from worker_thread+0x16c/0x1e8\n  worker_thread from kthread+0xa8/0xb8\n  kthread from ret_from_fork+0x14/0x38\n  Exception stack(0x8529ffb0 to 0x8529fff8)\n\nThe task deadlocks because the lock is already held:\n  ksmbd_session_rpc_open\n    down_write(\u0026sess-\u003erpc_lock)\n    ksmbd_rpc_open\n      ksmbd_session_rpc_method\n        down_read(\u0026sess-\u003erpc_lock)   \u003c-- deadlock\n\nAdjust ksmbd_session_rpc_method() callers to take the lock when necessary."
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              "value": "AV:N - ksmbd is the in-kernel SMB server listening on TCP/445, and the deadlock is triggered by a remote client sending an SMB2 CREATE for a named pipe on the IPC$ tree. No local access is needed.\nAC:L - This is an unconditional self-deadlock on a non-recursive rw_semaphore, hit deterministically on the very first named-pipe open \u2014 no race to win, no memory layout or timing dependency.\nPR:N - In the guest-mapping configuration common on ksmbd\u0027s NAS/embedded targets, ntlm_authenticate() skips NTLM password verification entirely for guest users, so an attacker with no credentials can establish a session, tree-connect to the always-present IPC$ share, and reach create_smb2_pipe().\nUI:N - The attacker triggers the deadlock purely by sending SMB2 protocol messages; no action by any local user or administrator is required.\nS:U - The deadlock affects kernel worker threads and ksmbd\u0027s own locks within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The thread blocks in down_read() before doing anything else; no memory is freed, over-read, or leaked, and no data is disclosed to the attacker.\nI:N - No memory corruption or data modification occurs \u2014 the only effect is a permanently held lock, which yields no write primitive.\nA:H - An unkillable D-state kworker holds sess-\u003erpc_lock forever, blocking connection teardown and \u2014 via ksmbd_sessions_deregister() holding the global sessions_table_lock \u2014 all sessions server-wide; destroy_workqueue() also hangs, so ksmbd cannot be restarted or unloaded and recovery requires a reboot."
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      "title": "ksmbd: fix recursive locking in RPC handle list access",
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    "cveId": "CVE-2025-40090",
    "datePublished": "2025-10-30T09:47:58.611Z",
    "dateReserved": "2025-04-16T07:20:57.162Z",
    "dateUpdated": "2026-08-05T12:07:42.312Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2025-40090",
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      "product_status:known_not_affected": "1",
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      "title": "ksmbd: fix recursive locking in RPC handle list access",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-40090.json",
      "version": "1"
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                "product": "Linux",
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                    "version": "6.17.3",
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        "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-\u003erpc_lock.\n\nThis causes hung connections / tasks when a client attempts to open\na named pipe. Using Samba\u0027s rpcclient tool:\n\n $ rpcclient //192.168.1.254 -U user%password\n $ rpcclient $\u003e srvinfo\n \u003cconnection hung here\u003e\n\nKernel side:\n  \"echo 0 \u003e /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(\u0026sess-\u003erpc_lock)\n    ksmbd_rpc_open\n      ksmbd_session_rpc_method\n        down_read(\u0026sess-\u003erpc_lock)   \u003c-- 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 (\u0027ksmbd: Corrige la condici\u00f3n de carrera en el acceso a la lista de manejadores RPC\u0027), ksmbd_session_rpc_method() intenta bloquear sess-\u003erpc_lock.\n\nEsto causa conexiones / tareas colgadas cuando un cliente intenta abrir una tuber\u00eda con nombre. Usando la herramienta rpcclient de Samba:\n\n $ rpcclient //192.168.1.254 -U user%password\n $ rpcclient $\u003e srvinfo\n \u003cconexi\u00f3n colgada aqu\u00ed\u003e\n\nLado del kernel:\n  \u0027echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\u0027 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 excepci\u00f3n(0x8529ffb0 a 0x8529fff8)\n\nLa tarea se interbloquea porque el bloqueo ya est\u00e1 retenido:\n  ksmbd_session_rpc_open\n    down_write(\u0026sess-\u003erpc_lock)\n    ksmbd_rpc_open\n      ksmbd_session_rpc_method\n        down_read(\u0026sess-\u003erpc_lock)   \u003c-- interbloqueo\n\nAjustar los llamadores de ksmbd_session_rpc_method() para tomar el bloqueo cuando sea necesario."
          }
        ],
        "id": "CVE-2025-40090",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
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        },
        "published": "2025-10-30T10:15:33.537",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "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"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-674"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:17:54+00:00",
      "cve": "CVE-2025-40090",
      "id": "CVE-2025-40090",
      "initial_release_date": "2025-10-30T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: fix recursive locking in RPC handle list access",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40090.json",
      "version": "3"
    }
  }
}



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