CVE-2025-40090 (GCVE-0-2025-40090)
Vulnerability from cvelistv5
Published
2025-10-30 09:47
Modified
2025-10-30 09:47
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 5cc679ba0f4505936124cd4179ba66bb0a4bd9f3
Version: 6bd7e0e55dcea2cf0d391bbc21c2eb069b4be3e1
Version: 305853cce379407090a73b38c5de5ba748893aee
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "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",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4602b8cee1481dbb896182e5cb1e8cf12910e9e7",
              "status": "affected",
              "version": "5cc679ba0f4505936124cd4179ba66bb0a4bd9f3",
              "versionType": "git"
            },
            {
              "lessThan": "3412fbd81b46b9cfae013817b61d4bbd27e09e36",
              "status": "affected",
              "version": "6bd7e0e55dcea2cf0d391bbc21c2eb069b4be3e1",
              "versionType": "git"
            },
            {
              "lessThan": "88f170814fea74911ceab798a43cbd7c5599bed4",
              "status": "affected",
              "version": "305853cce379407090a73b38c5de5ba748893aee",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "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",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18-rc1"
            },
            {
              "lessThan": "6.18-rc1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.55",
                  "versionStartIncluding": "6.12.53",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.5",
                  "versionStartIncluding": "6.17.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18-rc2",
                  "versionStartIncluding": "6.18-rc1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-30T09:47:58.611Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4602b8cee1481dbb896182e5cb1e8cf12910e9e7"
        },
        {
          "url": "https://git.kernel.org/stable/c/3412fbd81b46b9cfae013817b61d4bbd27e09e36"
        },
        {
          "url": "https://git.kernel.org/stable/c/88f170814fea74911ceab798a43cbd7c5599bed4"
        }
      ],
      "title": "ksmbd: fix recursive locking in RPC handle list access",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40090",
    "datePublished": "2025-10-30T09:47:58.611Z",
    "dateReserved": "2025-04-16T07:20:57.162Z",
    "dateUpdated": "2025-10-30T09:47:58.611Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40090\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-30T10:15:33.537\",\"lastModified\":\"2025-10-30T15:03:13.440\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3412fbd81b46b9cfae013817b61d4bbd27e09e36\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4602b8cee1481dbb896182e5cb1e8cf12910e9e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/88f170814fea74911ceab798a43cbd7c5599bed4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.