CVE-2025-40258mptcp: fix race condition in mptcp_schedule_work()
Updated under an hour ago ()
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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
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Deferred
- Record last updated
- Aug 5, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 3b1d6210a9577369103330b0d802b0bf74b65e7f before f865e6595acf33083168db76921e66ace8bf0e5b; from 3b1d6210a9577369103330b0d802b0bf74b65e7f before 99908e2d601236842d705d5fd04fb349577316f5; from 3b1d6210a9577369103330b0d802b0bf74b65e7f before db4f7968a75250ca6c4ed70d0a78beabb2dcee18; from 3b1d6210a9577369103330b0d802b0bf74b65e7f before 8f9ba1a99a89feef9b5867c15a0141a97e893309; from 3b1d6210a9577369103330b0d802b0bf74b65e7f before ac28dfddedf6f209190950fc71bcff65ec4ab47b; from 3b1d6210a9577369103330b0d802b0bf74b65e7f before 3fc7723ed01d1130d4bf7063c50e0af60ecccbb4; from 3b1d6210a9577369103330b0d802b0bf74b65e7f before 035bca3f017ee9dea3a5a756e77a6f7138cc6eea | CNA record |
Siemens RUGGEDCOM RST2428P siemens:ruggedcom_rst2428p (from the name) | before V4.0 | CISA ADP |
References
- https://git.kernel.org/stable/c/f865e6595acf33083168db76921e66ace8bf0e5b
- https://git.kernel.org/stable/c/99908e2d601236842d705d5fd04fb349577316f5
- https://git.kernel.org/stable/c/db4f7968a75250ca6c4ed70d0a78beabb2dcee18
- https://git.kernel.org/stable/c/8f9ba1a99a89feef9b5867c15a0141a97e893309
- https://git.kernel.org/stable/c/ac28dfddedf6f209190950fc71bcff65ec4ab47b
- https://git.kernel.org/stable/c/3fc7723ed01d1130d4bf7063c50e0af60ecccbb4
- https://git.kernel.org/stable/c/035bca3f017ee9dea3a5a756e77a6f7138cc6eea
- https://cert-portal.siemens.com/productcert/html/ssa-253495.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.