CVE-2025-40258

Advisory lineage Upstream: 0 Downstream: 138
Deferred
Published: 04 Dec 2025, 16:08
Last modified:02 Jun 2026, 13:00

Vulnerability Summary

Overall Risk (default)
minimal
0/100
CVSS Score
No data
EPSS Score
0.06% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

04 Dec 2025, 16:08
Published
Vulnerability first disclosed
02 Jun 2026, 13:00
Last Modified
Vulnerability information updated

Description

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

EPSS Trends

Current EPSS score: 0.06%• Percentile: 18%

Affected Systems

  • linux•linux

    ≥ 3b1d6210a9577369103330b0d802b0bf74b65e7f, < f865e6595acf33083168db76921e66ace8bf0e5b | ≥ 3b1d6210a9577369103330b0d802b0bf74b65e7f, < 99908e2d601236842d705d5fd04fb349577316f5 | ≥ 3b1d6210a9577369103330b0d802b0bf74b65e7f, < db4f7968a75250ca6c4ed70d0a78beabb2dcee18 | ≥ 3b1d6210a9577369103330b0d802b0bf74b65e7f, < 8f9ba1a99a89feef9b5867c15a0141a97e893309 | ≥ 3b1d6210a9577369103330b0d802b0bf74b65e7f, < ac28dfddedf6f209190950fc71bcff65ec4ab47b | ≥ 3b1d6210a9577369103330b0d802b0bf74b65e7f, < 3fc7723ed01d1130d4bf7063c50e0af60ecccbb4 | ≥ 3b1d6210a9577369103330b0d802b0bf74b65e7f, < 035bca3f017ee9dea3a5a756e77a6f7138cc6eea | 5.7

References (8)