{"api_version":"1","generated_at":"2026-10-25T02:57:54+00:00","cve":"CVE-2025-40231","urls":{"html":"https://cve.report/CVE-2025-40231","api":"https://cve.report/api/cve/CVE-2025-40231.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-40231","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-40231"},"summary":{"title":"vsock: fix lock inversion in vsock_assign_transport()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: fix lock inversion in vsock_assign_transport()\n\nSyzbot reported a potential lock inversion deadlock between\nvsock_register_mutex and sk_lock-AF_VSOCK when vsock_linger() is called.\n\nThe issue was introduced by commit 687aa0c5581b (\"vsock: Fix\ntransport_* TOCTOU\") which added vsock_register_mutex locking in\nvsock_assign_transport() around the transport->release() call, that can\ncall vsock_linger(). vsock_assign_transport() can be called with sk_lock\nheld. vsock_linger() calls sk_wait_event() that temporarily releases and\nre-acquires sk_lock. During this window, if another thread hold\nvsock_register_mutex while trying to acquire sk_lock, a circular\ndependency is created.\n\nFix this by releasing vsock_register_mutex before calling\ntransport->release() and vsock_deassign_transport(). This is safe\nbecause we don't need to hold vsock_register_mutex while releasing the\nold transport, and we ensure the new transport won't disappear by\nobtaining a module reference first via try_module_get().","state":"PUBLISHED","assigner":"Linux","published_at":"2025-12-04 16:16:15","updated_at":"2026-10-19 21:10:00"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/a2a4346eea8b4cb75037dbcb20b98cb454324f80","name":"https://git.kernel.org/stable/c/a2a4346eea8b4cb75037dbcb20b98cb454324f80","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/251caee792a21eb0b781aab91362b422c945e162","name":"https://git.kernel.org/stable/c/251caee792a21eb0b781aab91362b422c945e162","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ce4f856c64f0bc30e29302a0ce41f4295ca391c5","name":"https://git.kernel.org/stable/c/ce4f856c64f0bc30e29302a0ce41f4295ca391c5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/42ed0784d11adebf748711e503af0eb9f1e6d81d","name":"https://git.kernel.org/stable/c/42ed0784d11adebf748711e503af0eb9f1e6d81d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/09bba278ccde25a14b6e5088a9e65a8717d0cccf","name":"https://git.kernel.org/stable/c/09bba278ccde25a14b6e5088a9e65a8717d0cccf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f7c877e7535260cc7a21484c994e8ce7e8cb6780","name":"https://git.kernel.org/stable/c/f7c877e7535260cc7a21484c994e8ce7e8cb6780","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b44182c116778feaa05da52a426aeb9da1878dcf","name":"https://git.kernel.org/stable/c/b44182c116778feaa05da52a426aeb9da1878dcf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-40231","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-40231","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8667e8d0eb46bc54fdae30ba2f4786407d3d88eb ce4f856c64f0bc30e29302a0ce41f4295ca391c5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 36a439049b34cca0b3661276049b84a1f76cc21a 09bba278ccde25a14b6e5088a9e65a8717d0cccf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9ce53e744f18e73059d3124070e960f3aa9902bf b44182c116778feaa05da52a426aeb9da1878dcf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9d24bb6780282b0255b9929abe5e8f98007e2c6e 42ed0784d11adebf748711e503af0eb9f1e6d81d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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6.6.115 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.39 6.12.56 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.15.7 6.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.16","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.246 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.196 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.158 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.115 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.56 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.17.6 6.17.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2025","cve_id":"40231","cve":"CVE-2025-40231","epss":"0.002070000","percentile":"0.101580000","score_date":"2026-10-19","updated_at":"2026-10-20 00:13:48"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/vmw_vsock/af_vsock.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"ce4f856c64f0bc30e29302a0ce41f4295ca391c5","status":"affected","version":"8667e8d0eb46bc54fdae30ba2f4786407d3d88eb","versionType":"git"},{"lessThan":"09bba278ccde25a14b6e5088a9e65a8717d0cccf","status":"affected","version":"36a439049b34cca0b3661276049b84a1f76cc21a","versionType":"git"},{"lessThan":"b44182c116778feaa05da52a426aeb9da1878dcf","status":"affected","version":"9ce53e744f18e73059d3124070e960f3aa9902bf","versionType":"git"},{"lessThan":"42ed0784d11adebf748711e503af0eb9f1e6d81d","status":"affected","version":"9d24bb6780282b0255b9929abe5e8f98007e2c6e","versionType":"git"},{"lessThan":"251caee792a21eb0b781aab91362b422c945e162","status":"affected","version":"ae2c712ba39c7007de63cb0c75b51ce1caaf1da5","versionType":"git"},{"lessThan":"a2a4346eea8b4cb75037dbcb20b98cb454324f80","status":"affected","version":"687aa0c5581b8d4aa87fd92973e4ee576b550cdf","versionType":"git"},{"lessThan":"f7c877e7535260cc7a21484c994e8ce7e8cb6780","status":"affected","version":"687aa0c5581b8d4aa87fd92973e4ee576b550cdf","versionType":"git"},{"status":"affected","version":"7b73bddf54777fb62d4d8c7729d0affe6df04477","versionType":"git"},{"lessThan":"5.10.246","status":"affected","version":"5.10.240","versionType":"semver"},{"lessThan":"5.15.196","status":"affected","version":"5.15.189","versionType":"semver"},{"lessThan":"6.1.158","status":"affected","version":"6.1.146","versionType":"semver"},{"lessThan":"6.6.115","status":"affected","version":"6.6.99","versionType":"semver"},{"lessThan":"6.12.56","status":"affected","version":"6.12.39","versionType":"semver"},{"lessThan":"6.16","status":"affected","version":"6.15.7","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/vmw_vsock/af_vsock.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.16"},{"lessThan":"6.16","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.246","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.196","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.158","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.115","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.56","versionType":"semver"},{"lessThanOrEqual":"6.17.*","status":"unaffected","version":"6.17.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"6.18","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.246","versionStartIncluding":"5.10.240","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.196","versionStartIncluding":"5.15.189","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.158","versionStartIncluding":"6.1.146","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.115","versionStartIncluding":"6.6.99","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.56","versionStartIncluding":"6.12.39","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.17.6","versionStartIncluding":"6.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18","versionStartIncluding":"6.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15.7","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: fix lock inversion in vsock_assign_transport()\n\nSyzbot reported a potential lock inversion deadlock between\nvsock_register_mutex and sk_lock-AF_VSOCK when vsock_linger() is called.\n\nThe issue was introduced by commit 687aa0c5581b (\"vsock: Fix\ntransport_* TOCTOU\") which added vsock_register_mutex locking in\nvsock_assign_transport() around the transport->release() call, that can\ncall vsock_linger(). vsock_assign_transport() can be called with sk_lock\nheld. vsock_linger() calls sk_wait_event() that temporarily releases and\nre-acquires sk_lock. During this window, if another thread hold\nvsock_register_mutex while trying to acquire sk_lock, a circular\ndependency is created.\n\nFix this by releasing vsock_register_mutex before calling\ntransport->release() and vsock_deassign_transport(). This is safe\nbecause we don't need to hold vsock_register_mutex while releasing the\nold transport, and we ensure the new transport won't disappear by\nobtaining a module reference first via try_module_get()."}],"providerMetadata":{"dateUpdated":"2026-05-23T16:01:44.908Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/ce4f856c64f0bc30e29302a0ce41f4295ca391c5"},{"url":"https://git.kernel.org/stable/c/09bba278ccde25a14b6e5088a9e65a8717d0cccf"},{"url":"https://git.kernel.org/stable/c/b44182c116778feaa05da52a426aeb9da1878dcf"},{"url":"https://git.kernel.org/stable/c/42ed0784d11adebf748711e503af0eb9f1e6d81d"},{"url":"https://git.kernel.org/stable/c/251caee792a21eb0b781aab91362b422c945e162"},{"url":"https://git.kernel.org/stable/c/a2a4346eea8b4cb75037dbcb20b98cb454324f80"},{"url":"https://git.kernel.org/stable/c/f7c877e7535260cc7a21484c994e8ce7e8cb6780"}],"title":"vsock: fix lock inversion in vsock_assign_transport()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2025-40231","datePublished":"2025-12-04T15:31:22.199Z","dateReserved":"2025-04-16T07:20:57.180Z","dateUpdated":"2026-05-23T16:01:44.908Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-12-04 16:16:15","lastModifiedDate":"2026-10-19 21:10:00","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2025","CveId":"40231","Ordinal":"1","Title":"vsock: fix lock inversion in vsock_assign_transport()","CVE":"CVE-2025-40231","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"40231","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: fix lock inversion in vsock_assign_transport()\n\nSyzbot reported a potential lock inversion deadlock between\nvsock_register_mutex and sk_lock-AF_VSOCK when vsock_linger() is called.\n\nThe issue was introduced by commit 687aa0c5581b (\"vsock: Fix\ntransport_* TOCTOU\") which added vsock_register_mutex locking in\nvsock_assign_transport() around the transport->release() call, that can\ncall vsock_linger(). vsock_assign_transport() can be called with sk_lock\nheld. vsock_linger() calls sk_wait_event() that temporarily releases and\nre-acquires sk_lock. During this window, if another thread hold\nvsock_register_mutex while trying to acquire sk_lock, a circular\ndependency is created.\n\nFix this by releasing vsock_register_mutex before calling\ntransport->release() and vsock_deassign_transport(). This is safe\nbecause we don't need to hold vsock_register_mutex while releasing the\nold transport, and we ensure the new transport won't disappear by\nobtaining a module reference first via try_module_get().","Type":"Description","Title":"vsock: fix lock inversion in vsock_assign_transport()"}]}}}