{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-40258",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-40258"
  ],
  "published": "2025-12-04T16:09:50Z",
  "summary": "mptcp: fix race condition in mptcp_schedule_work()",
  "details": "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",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40258"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f865e6595acf33083168db76921e66ace8bf0e5b"
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    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/db4f7968a75250ca6c4ed70d0a78beabb2dcee18"
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    },
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      "url": "https://git.kernel.org/stable/c/ac28dfddedf6f209190950fc71bcff65ec4ab47b"
    },
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      "url": "https://git.kernel.org/stable/c/3fc7723ed01d1130d4bf7063c50e0af60ecccbb4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/035bca3f017ee9dea3a5a756e77a6f7138cc6eea"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z"
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}