{"api_version":"1","generated_at":"2026-09-21T14:19:24+00:00","cve":"CVE-2025-40090","urls":{"html":"https://cve.report/CVE-2025-40090","api":"https://cve.report/api/cve/CVE-2025-40090.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-40090","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-40090"},"summary":{"title":"ksmbd: fix recursive locking in RPC handle list access","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2025-10-30 10:15:33","updated_at":"2026-07-30 06:24:10"},"problem_types":["CWE-674"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"5.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","data":{"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"}},{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"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"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/5493571f4351f74e11db9943e98a07c56467cf7e","name":"https://git.kernel.org/stable/c/5493571f4351f74e11db9943e98a07c56467cf7e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3412fbd81b46b9cfae013817b61d4bbd27e09e36","name":"https://git.kernel.org/stable/c/3412fbd81b46b9cfae013817b61d4bbd27e09e36","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4602b8cee1481dbb896182e5cb1e8cf12910e9e7","name":"https://git.kernel.org/stable/c/4602b8cee1481dbb896182e5cb1e8cf12910e9e7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1891abe832cbf5a11039e088766131d0f1642d02","name":"https://git.kernel.org/stable/c/1891abe832cbf5a11039e088766131d0f1642d02","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/88f170814fea74911ceab798a43cbd7c5599bed4","name":"https://git.kernel.org/stable/c/88f170814fea74911ceab798a43cbd7c5599bed4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-40090","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-40090","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 69674b029002b1d90b655f014bdf64f404efa54d 5493571f4351f74e11db9943e98a07c56467cf7e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6b615a8fb3af0baf8126cde3d4fee97d57222ffc 1891abe832cbf5a11039e088766131d0f1642d02 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5cc679ba0f4505936124cd4179ba66bb0a4bd9f3 4602b8cee1481dbb896182e5cb1e8cf12910e9e7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6bd7e0e55dcea2cf0d391bbc21c2eb069b4be3e1 3412fbd81b46b9cfae013817b61d4bbd27e09e36 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 305853cce379407090a73b38c5de5ba748893aee 88f170814fea74911ceab798a43cbd7c5599bed4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.53 6.12.55 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.17.3 6.17.5 semver","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2025","cve_id":"40090","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"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":"5493571f4351f74e11db9943e98a07c56467cf7e","status":"affected","version":"69674b029002b1d90b655f014bdf64f404efa54d","versionType":"git"},{"lessThan":"1891abe832cbf5a11039e088766131d0f1642d02","status":"affected","version":"6b615a8fb3af0baf8126cde3d4fee97d57222ffc","versionType":"git"},{"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":"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":"6.12.55","status":"affected","version":"6.12.53","versionType":"semver"},{"lessThan":"6.17.5","status":"affected","version":"6.17.3","versionType":"semver"}]}],"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}],"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->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."}],"metrics":[{"cvssV3_1":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-30T06:00:33.603Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/5493571f4351f74e11db9943e98a07c56467cf7e"},{"url":"https://git.kernel.org/stable/c/1891abe832cbf5a11039e088766131d0f1642d02"},{"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":"2026-07-30T06:00:33.603Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-10-30 10:15:33","lastModifiedDate":"2026-07-30 06:24:10","problem_types":["CWE-674"],"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":"nvd@nist.gov","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}]},"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"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2025","CveId":"40090","Ordinal":"1","Title":"ksmbd: fix recursive locking in RPC handle list access","CVE":"CVE-2025-40090","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"40090","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"ksmbd: fix recursive locking in RPC handle list access"}]}}}