{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2025-40258", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-40258", "idYear": 2025, "status": "PUBLISHED", "publishedAt": "2025-12-04T16:08:19.176Z", "updatedAt": "2026-08-05T12:08:58.094Z", "importedAt": "2026-10-24T01:57:34.152Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "mptcp: fix race condition in mptcp_schedule_work()", "summary": "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 \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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "3b1d6210a9577369103330b0d802b0bf74b65e7f", "status": "affected", "versionType": "git", "lessThan": "f865e6595acf33083168db76921e66ace8bf0e5b" }, { "version": "3b1d6210a9577369103330b0d802b0bf74b65e7f", "status": "affected", "versionType": "git", "lessThan": "99908e2d601236842d705d5fd04fb349577316f5" }, { "version": "3b1d6210a9577369103330b0d802b0bf74b65e7f", "status": "affected", "versionType": "git", "lessThan": "db4f7968a75250ca6c4ed70d0a78beabb2dcee18" }, { "version": "3b1d6210a9577369103330b0d802b0bf74b65e7f", "status": "affected", "versionType": "git", "lessThan": "8f9ba1a99a89feef9b5867c15a0141a97e893309" }, { "version": "3b1d6210a9577369103330b0d802b0bf74b65e7f", "status": "affected", "versionType": "git", "lessThan": "ac28dfddedf6f209190950fc71bcff65ec4ab47b" }, { "version": "3b1d6210a9577369103330b0d802b0bf74b65e7f", "status": "affected", "versionType": "git", "lessThan": "3fc7723ed01d1130d4bf7063c50e0af60ecccbb4" }, { "version": "3b1d6210a9577369103330b0d802b0bf74b65e7f", "status": "affected", "versionType": "git", "lessThan": "035bca3f017ee9dea3a5a756e77a6f7138cc6eea" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.7", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.7" }, { "version": "5.10.247", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.197", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.159", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.118", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.60", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.17.10", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.17.*" }, { "version": "6.18", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }