{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-40258", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.182Z", "datePublished": "2025-12-04T16:08:19.176Z", "dateUpdated": "2026-05-11T21:45:51.351Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:45:51.351Z"}, "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"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/mptcp/protocol.c"], "versions": [{"version": "3b1d6210a9577369103330b0d802b0bf74b65e7f", "lessThan": "f865e6595acf33083168db76921e66ace8bf0e5b", "status": "affected", "versionType": "git"}, {"version": "3b1d6210a9577369103330b0d802b0bf74b65e7f", "lessThan": "99908e2d601236842d705d5fd04fb349577316f5", "status": "affected", "versionType": "git"}, {"version": "3b1d6210a9577369103330b0d802b0bf74b65e7f", "lessThan": "db4f7968a75250ca6c4ed70d0a78beabb2dcee18", "status": "affected", "versionType": "git"}, {"version": "3b1d6210a9577369103330b0d802b0bf74b65e7f", "lessThan": "8f9ba1a99a89feef9b5867c15a0141a97e893309", "status": "affected", "versionType": "git"}, {"version": "3b1d6210a9577369103330b0d802b0bf74b65e7f", "lessThan": "ac28dfddedf6f209190950fc71bcff65ec4ab47b", "status": "affected", "versionType": "git"}, {"version": "3b1d6210a9577369103330b0d802b0bf74b65e7f", "lessThan": "3fc7723ed01d1130d4bf7063c50e0af60ecccbb4", "status": "affected", "versionType": "git"}, {"version": "3b1d6210a9577369103330b0d802b0bf74b65e7f", "lessThan": "035bca3f017ee9dea3a5a756e77a6f7138cc6eea", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/mptcp/protocol.c"], "versions": [{"version": "5.7", "status": "affected"}, {"version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.247", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.197", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.159", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.118", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.60", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.10", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.10.247"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.15.197"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.1.159"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.6.118"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.12.60"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.17.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.18"}]}]}], "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"}}}}

{}

{"cveTags": [], "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"}], "id": "CVE-2025-40258", "lastModified": "2026-04-15T00:35:42.020", "metrics": {}, "published": "2025-12-04T16:16:19.640", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/035bca3f017ee9dea3a5a756e77a6f7138cc6eea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3fc7723ed01d1130d4bf7063c50e0af60ecccbb4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8f9ba1a99a89feef9b5867c15a0141a97e893309"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/99908e2d601236842d705d5fd04fb349577316f5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ac28dfddedf6f209190950fc71bcff65ec4ab47b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/db4f7968a75250ca6c4ed70d0a78beabb2dcee18"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f865e6595acf33083168db76921e66ace8bf0e5b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: mptcp: fix race condition in mptcp_schedule_work()", "id": "2418876", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2418876"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmptcp: fix race condition in mptcp_schedule_work()\nsyzbot reported use-after-free in mptcp_schedule_work() [1]\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[A] if (schedule_work(...)) {\n[B] sock_hold(sk);\nreturn true;\n}\nProblem is that mptcp_worker() can run immediately and complete before [B]\nWe need instead :\nsock_hold(sk);\nif (schedule_work(...))\nreturn true;\nsock_put(sk);\n[1]\nrefcount_t: addition on 0; use-after-free.\nWARNING: 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]\nrefcount_inc include/linux/refcount.h:383 [inline]\nsock_hold include/net/sock.h:816 [inline]\nmptcp_schedule_work+0x164/0x1a0 net/mptcp/protocol.c:943\nmptcp_tout_timer+0x21/0xa0 net/mptcp/protocol.c:2316\ncall_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747\nexpire_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\nrun_timer_base kernel/time/timer.c:2393 [inline]\nrun_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403\nhandle_softirqs+0x22f/0x710 kernel/softirq.c:622\n__do_softirq kernel/softirq.c:656 [inline]\nrun_ktimerd+0xcf/0x190 kernel/softirq.c:1138\nsmpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160\nkthread+0x711/0x8a0 kernel/kthread.c:463\nret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158\nret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245"], "name": "CVE-2025-40258", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-12-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40258\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40258\nhttps://lore.kernel.org/linux-cve-announce/2025120433-CVE-2025-40258-d10d@gregkh/T"], "threat_severity": "Important"}

{}