{"id":"CVE-2025-71144","summary":"mptcp: ensure context reset on disconnect()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: ensure context reset on disconnect()\n\nAfter the blamed commit below, if the MPC subflow is already in TCP_CLOSE\nstatus or has fallback to TCP at mptcp_disconnect() time,\nmptcp_do_fastclose() skips setting the `send_fastclose flag` and the later\n__mptcp_close_ssk() does not reset anymore the related subflow context.\n\nAny later connection will be created with both the `request_mptcp` flag\nand the msk-level fallback status off (it is unconditionally cleared at\nMPTCP disconnect time), leading to a warning in subflow_data_ready():\n\n  WARNING: CPU: 26 PID: 8996 at net/mptcp/subflow.c:1519 subflow_data_ready (net/mptcp/subflow.c:1519 (discriminator 13))\n  Modules linked in:\n  CPU: 26 UID: 0 PID: 8996 Comm: syz.22.39 Not tainted 6.18.0-rc7-05427-g11fc074f6c36 #1 PREEMPT(voluntary)\n  Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011\n  RIP: 0010:subflow_data_ready (net/mptcp/subflow.c:1519 (discriminator 13))\n  Code: 90 0f 0b 90 90 e9 04 fe ff ff e8 b7 1e f5 fe 89 ee bf 07 00 00 00 e8 db 19 f5 fe 83 fd 07 0f 84 35 ff ff ff e8 9d 1e f5 fe 90 \u003c0f\u003e 0b 90 e9 27 ff ff ff e8 8f 1e f5 fe 4c 89 e7 48 89 de e8 14 09\n  RSP: 0018:ffffc9002646fb30 EFLAGS: 00010293\n  RAX: 0000000000000000 RBX: ffff88813b218000 RCX: ffffffff825c8435\n  RDX: ffff8881300b3580 RSI: ffffffff825c8443 RDI: 0000000000000005\n  RBP: 000000000000000b R08: ffffffff825c8435 R09: 000000000000000b\n  R10: 0000000000000005 R11: 0000000000000007 R12: ffff888131ac0000\n  R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\n  FS:  00007f88330af6c0(0000) GS:ffff888a93dd2000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f88330aefe8 CR3: 000000010ff59000 CR4: 0000000000350ef0\n  Call Trace:\n   \u003cTASK\u003e\n   tcp_data_ready (net/ipv4/tcp_input.c:5356)\n   tcp_data_queue (net/ipv4/tcp_input.c:5445)\n   tcp_rcv_state_process (net/ipv4/tcp_input.c:7165)\n   tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1955)\n   __release_sock (include/net/sock.h:1158 (discriminator 6) net/core/sock.c:3180 (discriminator 6))\n   release_sock (net/core/sock.c:3737)\n   mptcp_sendmsg (net/mptcp/protocol.c:1763 net/mptcp/protocol.c:1857)\n   inet_sendmsg (net/ipv4/af_inet.c:853 (discriminator 7))\n   __sys_sendto (net/socket.c:727 (discriminator 15) net/socket.c:742 (discriminator 15) net/socket.c:2244 (discriminator 15))\n   __x64_sys_sendto (net/socket.c:2247)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))\n   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n  RIP: 0033:0x7f883326702d\n\nAddress the issue setting an explicit `fastclosing` flag at fastclose\ntime, and checking such flag after mptcp_do_fastclose().","modified":"2026-04-16T04:40:44.104048644Z","published":"2026-01-14T15:08:56.700Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71144.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1c7c3a9314d8a7fc0e9a508606466a967c8e774a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/226fff52e7ed9fc8cd63327133739b3d92537ffd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5c7c7135468f3fc6379cde9777a2c18bfe92d82f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/86730ac255b0497a272704de9a1df559f5d6602e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f1a77dfc3b045c3dd5f6e64189b9f52b90399f07"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71144.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-71144"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"9ea05fabce31ff93a0adae8221c58bc6d7b832f3"},{"fixed":"226fff52e7ed9fc8cd63327133739b3d92537ffd"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3a13454fd098ed51e733958488f8ec62859a9ed8"},{"fixed":"5c7c7135468f3fc6379cde9777a2c18bfe92d82f"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f6fb2cbc91a81178dea23d463503b4525a76825d"},{"fixed":"1c7c3a9314d8a7fc0e9a508606466a967c8e774a"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ae155060247be8dcae3802a95bd1bdf93ab3215d"},{"fixed":"f1a77dfc3b045c3dd5f6e64189b9f52b90399f07"},{"fixed":"86730ac255b0497a272704de9a1df559f5d6602e"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"c4f7b0916b95fd2226e5ab98882482b08f52e1c0"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-71144.json"}}],"schema_version":"1.7.5"}