CVE-2025-40258 (GCVE-0-2025-40258)

Vulnerability from cvelistv5 – Published: 2025-12-04 16:08 – Updated: 2025-12-04 16:08
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix race condition in mptcp_schedule_work() syzbot reported use-after-free in mptcp_schedule_work() [1] Issue here is that mptcp_schedule_work() schedules a work, then gets a refcount on sk->sk_refcnt if the work was scheduled. This refcount will be released by mptcp_worker(). [A] if (schedule_work(...)) { [B] sock_hold(sk); return true; } Problem is that mptcp_worker() can run immediately and complete before [B] We need instead : sock_hold(sk); if (schedule_work(...)) return true; sock_put(sk); [1] refcount_t: addition on 0; use-after-free. WARNING: CPU: 1 PID: 29 at lib/refcount.c:25 refcount_warn_saturate+0xfa/0x1d0 lib/refcount.c:25 Call Trace: <TASK> __refcount_add include/linux/refcount.h:-1 [inline] __refcount_inc include/linux/refcount.h:366 [inline] refcount_inc include/linux/refcount.h:383 [inline] sock_hold include/net/sock.h:816 [inline] mptcp_schedule_work+0x164/0x1a0 net/mptcp/protocol.c:943 mptcp_tout_timer+0x21/0xa0 net/mptcp/protocol.c:2316 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x648/0x970 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 handle_softirqs+0x22f/0x710 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] run_ktimerd+0xcf/0x190 kernel/softirq.c:1138 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3b1d6210a9577369103330b0d802b0bf74b65e7f , < 8f9ba1a99a89feef9b5867c15a0141a97e893309 (git)
Affected: 3b1d6210a9577369103330b0d802b0bf74b65e7f , < ac28dfddedf6f209190950fc71bcff65ec4ab47b (git)
Affected: 3b1d6210a9577369103330b0d802b0bf74b65e7f , < 3fc7723ed01d1130d4bf7063c50e0af60ecccbb4 (git)
Affected: 3b1d6210a9577369103330b0d802b0bf74b65e7f , < 035bca3f017ee9dea3a5a756e77a6f7138cc6eea (git)
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    Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 6.6.118 , ≤ 6.6.* (semver)
Unaffected: 6.12.60 , ≤ 6.12.* (semver)
Unaffected: 6.17.10 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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              "operator": "OR"
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      "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-\u003esk_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 \u003cTASK\u003e\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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        "dateUpdated": "2025-12-04T16:08:19.176Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/8f9ba1a99a89feef9b5867c15a0141a97e893309"
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          "url": "https://git.kernel.org/stable/c/ac28dfddedf6f209190950fc71bcff65ec4ab47b"
        },
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          "url": "https://git.kernel.org/stable/c/3fc7723ed01d1130d4bf7063c50e0af60ecccbb4"
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        {
          "url": "https://git.kernel.org/stable/c/035bca3f017ee9dea3a5a756e77a6f7138cc6eea"
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      ],
      "title": "mptcp: fix race condition in mptcp_schedule_work()",
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    "cveId": "CVE-2025-40258",
    "datePublished": "2025-12-04T16:08:19.176Z",
    "dateReserved": "2025-04-16T07:20:57.182Z",
    "dateUpdated": "2025-12-04T16:08:19.176Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40258\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-04T16:16:19.640\",\"lastModified\":\"2025-12-04T17:15:08.283\",\"vulnStatus\":\"Awaiting Analysis\",\"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-\u003esk_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 \u003cTASK\u003e\\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\"}],\"metrics\":{},\"references\":[{\"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/ac28dfddedf6f209190950fc71bcff65ec4ab47b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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