{"api_version":"1","generated_at":"2026-06-03T01:32:19+00:00","cve":"CVE-2025-40258","urls":{"html":"https://cve.report/CVE-2025-40258","api":"https://cve.report/api/cve/CVE-2025-40258.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-40258","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-40258"},"summary":{"title":"mptcp: fix race condition in mptcp_schedule_work()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix race condition in mptcp_schedule_work()\n\nsyzbot reported use-after-free in mptcp_schedule_work() [1]\n\nIssue here is that mptcp_schedule_work() schedules a work,\nthen gets a refcount on sk->sk_refcnt if the work was scheduled.\nThis refcount will be released by mptcp_worker().\n\n[A] if (schedule_work(...)) {\n[B]     sock_hold(sk);\n        return true;\n    }\n\nProblem is that mptcp_worker() can run immediately and complete before [B]\n\nWe need instead :\n\n    sock_hold(sk);\n    if (schedule_work(...))\n        return true;\n    sock_put(sk);\n\n[1]\nrefcount_t: addition on 0; use-after-free.\n WARNING: CPU: 1 PID: 29 at lib/refcount.c:25 refcount_warn_saturate+0xfa/0x1d0 lib/refcount.c:25\nCall Trace:\n <TASK>\n __refcount_add include/linux/refcount.h:-1 [inline]\n  __refcount_inc include/linux/refcount.h:366 [inline]\n  refcount_inc include/linux/refcount.h:383 [inline]\n  sock_hold include/net/sock.h:816 [inline]\n  mptcp_schedule_work+0x164/0x1a0 net/mptcp/protocol.c:943\n  mptcp_tout_timer+0x21/0xa0 net/mptcp/protocol.c:2316\n  call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747\n  expire_timers kernel/time/timer.c:1798 [inline]\n  __run_timers kernel/time/timer.c:2372 [inline]\n  __run_timer_base+0x648/0x970 kernel/time/timer.c:2384\n  run_timer_base kernel/time/timer.c:2393 [inline]\n  run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403\n  handle_softirqs+0x22f/0x710 kernel/softirq.c:622\n  __do_softirq kernel/softirq.c:656 [inline]\n  run_ktimerd+0xcf/0x190 kernel/softirq.c:1138\n  smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160\n  kthread+0x711/0x8a0 kernel/kthread.c:463\n  ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245","state":"PUBLISHED","assigner":"Linux","published_at":"2025-12-04 16:16:19","updated_at":"2026-06-02 14:16:32"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/8f9ba1a99a89feef9b5867c15a0141a97e893309","name":"https://git.kernel.org/stable/c/8f9ba1a99a89feef9b5867c15a0141a97e893309","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/99908e2d601236842d705d5fd04fb349577316f5","name":"https://git.kernel.org/stable/c/99908e2d601236842d705d5fd04fb349577316f5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/035bca3f017ee9dea3a5a756e77a6f7138cc6eea","name":"https://git.kernel.org/stable/c/035bca3f017ee9dea3a5a756e77a6f7138cc6eea","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f865e6595acf33083168db76921e66ace8bf0e5b","name":"https://git.kernel.org/stable/c/f865e6595acf33083168db76921e66ace8bf0e5b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ac28dfddedf6f209190950fc71bcff65ec4ab47b","name":"https://git.kernel.org/stable/c/ac28dfddedf6f209190950fc71bcff65ec4ab47b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3fc7723ed01d1130d4bf7063c50e0af60ecccbb4","name":"https://git.kernel.org/stable/c/3fc7723ed01d1130d4bf7063c50e0af60ecccbb4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-253495.html","name":"https://cert-portal.siemens.com/productcert/html/ssa-253495.html","refsource":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/db4f7968a75250ca6c4ed70d0a78beabb2dcee18","name":"https://git.kernel.org/stable/c/db4f7968a75250ca6c4ed70d0a78beabb2dcee18","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-40258","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-40258","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3b1d6210a9577369103330b0d802b0bf74b65e7f f865e6595acf33083168db76921e66ace8bf0e5b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3b1d6210a9577369103330b0d802b0bf74b65e7f 99908e2d601236842d705d5fd04fb349577316f5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3b1d6210a9577369103330b0d802b0bf74b65e7f db4f7968a75250ca6c4ed70d0a78beabb2dcee18 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3b1d6210a9577369103330b0d802b0bf74b65e7f 8f9ba1a99a89feef9b5867c15a0141a97e893309 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3b1d6210a9577369103330b0d802b0bf74b65e7f ac28dfddedf6f209190950fc71bcff65ec4ab47b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3b1d6210a9577369103330b0d802b0bf74b65e7f 3fc7723ed01d1130d4bf7063c50e0af60ecccbb4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3b1d6210a9577369103330b0d802b0bf74b65e7f 035bca3f017ee9dea3a5a756e77a6f7138cc6eea git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.7","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.7 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.247 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.197 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.159 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.118 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.60 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.17.10 6.17.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18 * original_commit_for_fix","platforms":[]},{"source":"ADP","vendor":"Siemens","product":"RUGGEDCOM RST2428P","version":"affected V4.0 custom","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2025","cve_id":"40258","cve":"CVE-2025-40258","epss":"0.000580000","percentile":"0.183830000","score_date":"2026-06-02","updated_at":"2026-06-03 00:08:15"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"affected":[{"defaultStatus":"unknown","product":"RUGGEDCOM RST2428P","vendor":"Siemens","versions":[{"lessThan":"V4.0","status":"affected","version":"0","versionType":"custom"}]}],"providerMetadata":{"dateUpdated":"2026-06-02T13:00:11.516Z","orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","shortName":"siemens-SADP"},"references":[{"url":"https://cert-portal.siemens.com/productcert/html/ssa-253495.html"}],"x_adpType":"supplier"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/mptcp/protocol.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"f865e6595acf33083168db76921e66ace8bf0e5b","status":"affected","version":"3b1d6210a9577369103330b0d802b0bf74b65e7f","versionType":"git"},{"lessThan":"99908e2d601236842d705d5fd04fb349577316f5","status":"affected","version":"3b1d6210a9577369103330b0d802b0bf74b65e7f","versionType":"git"},{"lessThan":"db4f7968a75250ca6c4ed70d0a78beabb2dcee18","status":"affected","version":"3b1d6210a9577369103330b0d802b0bf74b65e7f","versionType":"git"},{"lessThan":"8f9ba1a99a89feef9b5867c15a0141a97e893309","status":"affected","version":"3b1d6210a9577369103330b0d802b0bf74b65e7f","versionType":"git"},{"lessThan":"ac28dfddedf6f209190950fc71bcff65ec4ab47b","status":"affected","version":"3b1d6210a9577369103330b0d802b0bf74b65e7f","versionType":"git"},{"lessThan":"3fc7723ed01d1130d4bf7063c50e0af60ecccbb4","status":"affected","version":"3b1d6210a9577369103330b0d802b0bf74b65e7f","versionType":"git"},{"lessThan":"035bca3f017ee9dea3a5a756e77a6f7138cc6eea","status":"affected","version":"3b1d6210a9577369103330b0d802b0bf74b65e7f","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/mptcp/protocol.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.7"},{"lessThan":"5.7","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.247","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.197","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.159","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.118","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.60","versionType":"semver"},{"lessThanOrEqual":"6.17.*","status":"unaffected","version":"6.17.10","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":"5.10.247","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.197","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.159","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.118","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.60","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.17.10","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18","versionStartIncluding":"5.7","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix race condition in mptcp_schedule_work()\n\nsyzbot reported use-after-free in mptcp_schedule_work() [1]\n\nIssue here is that mptcp_schedule_work() schedules a work,\nthen gets a refcount on sk->sk_refcnt if the work was scheduled.\nThis refcount will be released by mptcp_worker().\n\n[A] if (schedule_work(...)) {\n[B]     sock_hold(sk);\n        return true;\n    }\n\nProblem is that mptcp_worker() can run immediately and complete before [B]\n\nWe need instead :\n\n    sock_hold(sk);\n    if (schedule_work(...))\n        return true;\n    sock_put(sk);\n\n[1]\nrefcount_t: addition on 0; use-after-free.\n WARNING: CPU: 1 PID: 29 at lib/refcount.c:25 refcount_warn_saturate+0xfa/0x1d0 lib/refcount.c:25\nCall Trace:\n <TASK>\n __refcount_add include/linux/refcount.h:-1 [inline]\n  __refcount_inc include/linux/refcount.h:366 [inline]\n  refcount_inc include/linux/refcount.h:383 [inline]\n  sock_hold include/net/sock.h:816 [inline]\n  mptcp_schedule_work+0x164/0x1a0 net/mptcp/protocol.c:943\n  mptcp_tout_timer+0x21/0xa0 net/mptcp/protocol.c:2316\n  call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747\n  expire_timers kernel/time/timer.c:1798 [inline]\n  __run_timers kernel/time/timer.c:2372 [inline]\n  __run_timer_base+0x648/0x970 kernel/time/timer.c:2384\n  run_timer_base kernel/time/timer.c:2393 [inline]\n  run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403\n  handle_softirqs+0x22f/0x710 kernel/softirq.c:622\n  __do_softirq kernel/softirq.c:656 [inline]\n  run_ktimerd+0xcf/0x190 kernel/softirq.c:1138\n  smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160\n  kthread+0x711/0x8a0 kernel/kthread.c:463\n  ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245"}],"providerMetadata":{"dateUpdated":"2026-05-11T21:45:51.351Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/f865e6595acf33083168db76921e66ace8bf0e5b"},{"url":"https://git.kernel.org/stable/c/99908e2d601236842d705d5fd04fb349577316f5"},{"url":"https://git.kernel.org/stable/c/db4f7968a75250ca6c4ed70d0a78beabb2dcee18"},{"url":"https://git.kernel.org/stable/c/8f9ba1a99a89feef9b5867c15a0141a97e893309"},{"url":"https://git.kernel.org/stable/c/ac28dfddedf6f209190950fc71bcff65ec4ab47b"},{"url":"https://git.kernel.org/stable/c/3fc7723ed01d1130d4bf7063c50e0af60ecccbb4"},{"url":"https://git.kernel.org/stable/c/035bca3f017ee9dea3a5a756e77a6f7138cc6eea"}],"title":"mptcp: fix race condition in mptcp_schedule_work()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2025-40258","datePublished":"2025-12-04T16:08:19.176Z","dateReserved":"2025-04-16T07:20:57.182Z","dateUpdated":"2026-06-02T13:00:11.516Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-12-04 16:16:19","lastModifiedDate":"2026-06-02 14:16:32","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2025","CveId":"40258","Ordinal":"1","Title":"mptcp: fix race condition in mptcp_schedule_work()","CVE":"CVE-2025-40258","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"40258","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix race condition in mptcp_schedule_work()\n\nsyzbot reported use-after-free in mptcp_schedule_work() [1]\n\nIssue here is that mptcp_schedule_work() schedules a work,\nthen gets a refcount on sk->sk_refcnt if the work was scheduled.\nThis refcount will be released by mptcp_worker().\n\n[A] if (schedule_work(...)) {\n[B]     sock_hold(sk);\n        return true;\n    }\n\nProblem is that mptcp_worker() can run immediately and complete before [B]\n\nWe need instead :\n\n    sock_hold(sk);\n    if (schedule_work(...))\n        return true;\n    sock_put(sk);\n\n[1]\nrefcount_t: addition on 0; use-after-free.\n WARNING: CPU: 1 PID: 29 at lib/refcount.c:25 refcount_warn_saturate+0xfa/0x1d0 lib/refcount.c:25\nCall Trace:\n <TASK>\n __refcount_add include/linux/refcount.h:-1 [inline]\n  __refcount_inc include/linux/refcount.h:366 [inline]\n  refcount_inc include/linux/refcount.h:383 [inline]\n  sock_hold include/net/sock.h:816 [inline]\n  mptcp_schedule_work+0x164/0x1a0 net/mptcp/protocol.c:943\n  mptcp_tout_timer+0x21/0xa0 net/mptcp/protocol.c:2316\n  call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747\n  expire_timers kernel/time/timer.c:1798 [inline]\n  __run_timers kernel/time/timer.c:2372 [inline]\n  __run_timer_base+0x648/0x970 kernel/time/timer.c:2384\n  run_timer_base kernel/time/timer.c:2393 [inline]\n  run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403\n  handle_softirqs+0x22f/0x710 kernel/softirq.c:622\n  __do_softirq kernel/softirq.c:656 [inline]\n  run_ktimerd+0xcf/0x190 kernel/softirq.c:1138\n  smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160\n  kthread+0x711/0x8a0 kernel/kthread.c:463\n  ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245","Type":"Description","Title":"mptcp: fix race condition in mptcp_schedule_work()"}]}}}