{"schema_version":"1.7.5","id":"CVE-2025-38491","published":"2025-07-28T11:21:59.852Z","modified":"2026-07-15T01:48:51.224942378Z","related":["SUSE-SU-2025:03272-1","SUSE-SU-2025:03290-1","SUSE-SU-2025:03301-1","SUSE-SU-2025:03382-1","SUSE-SU-2025:03602-1","SUSE-SU-2025:03633-1","SUSE-SU-2025:03634-1","SUSE-SU-2025:20653-1","SUSE-SU-2025:20669-1","SUSE-SU-2025:20739-1","SUSE-SU-2025:20756-1","SUSE-SU-2025:21074-1","SUSE-SU-2025:21139-1","SUSE-SU-2025:21179-1","SUSE-SU-2026:20560-1","openSUSE-SU-2025:20081-1"],"summary":"mptcp: make fallback action and fallback decision atomic","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: make fallback action and fallback decision atomic\n\nSyzkaller reported the following splat:\n\n  WARNING: CPU: 1 PID: 7704 at net/mptcp/protocol.h:1223 __mptcp_do_fallback net/mptcp/protocol.h:1223 [inline]\n  WARNING: CPU: 1 PID: 7704 at net/mptcp/protocol.h:1223 mptcp_do_fallback net/mptcp/protocol.h:1244 [inline]\n  WARNING: CPU: 1 PID: 7704 at net/mptcp/protocol.h:1223 check_fully_established net/mptcp/options.c:982 [inline]\n  WARNING: CPU: 1 PID: 7704 at net/mptcp/protocol.h:1223 mptcp_incoming_options+0x21a8/0x2510 net/mptcp/options.c:1153\n  Modules linked in:\n  CPU: 1 UID: 0 PID: 7704 Comm: syz.3.1419 Not tainted 6.16.0-rc3-gbd5ce2324dba #20 PREEMPT(voluntary)\n  Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n  RIP: 0010:__mptcp_do_fallback net/mptcp/protocol.h:1223 [inline]\n  RIP: 0010:mptcp_do_fallback net/mptcp/protocol.h:1244 [inline]\n  RIP: 0010:check_fully_established net/mptcp/options.c:982 [inline]\n  RIP: 0010:mptcp_incoming_options+0x21a8/0x2510 net/mptcp/options.c:1153\n  Code: 24 18 e8 bb 2a 00 fd e9 1b df ff ff e8 b1 21 0f 00 e8 ec 5f c4 fc 44 0f b7 ac 24 b0 00 00 00 e9 54 f1 ff ff e8 d9 5f c4 fc 90 <0f> 0b 90 e9 b8 f4 ff ff e8 8b 2a 00 fd e9 8d e6 ff ff e8 81 2a 00\n  RSP: 0018:ffff8880a3f08448 EFLAGS: 00010246\n  RAX: 0000000000000000 RBX: ffff8880180a8000 RCX: ffffffff84afcf45\n  RDX: ffff888090223700 RSI: ffffffff84afdaa7 RDI: 0000000000000001\n  RBP: ffff888017955780 R08: 0000000000000001 R09: 0000000000000000\n  R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000\n  R13: ffff8880180a8910 R14: ffff8880a3e9d058 R15: 0000000000000000\n  FS:  00005555791b8500(0000) GS:ffff88811c495000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 000000110c2800b7 CR3: 0000000058e44000 CR4: 0000000000350ef0\n  Call Trace:\n   <IRQ>\n   tcp_reset+0x26f/0x2b0 net/ipv4/tcp_input.c:4432\n   tcp_validate_incoming+0x1057/0x1b60 net/ipv4/tcp_input.c:5975\n   tcp_rcv_established+0x5b5/0x21f0 net/ipv4/tcp_input.c:6166\n   tcp_v4_do_rcv+0x5dc/0xa70 net/ipv4/tcp_ipv4.c:1925\n   tcp_v4_rcv+0x3473/0x44a0 net/ipv4/tcp_ipv4.c:2363\n   ip_protocol_deliver_rcu+0xba/0x480 net/ipv4/ip_input.c:205\n   ip_local_deliver_finish+0x2f1/0x500 net/ipv4/ip_input.c:233\n   NF_HOOK include/linux/netfilter.h:317 [inline]\n   NF_HOOK include/linux/netfilter.h:311 [inline]\n   ip_local_deliver+0x1be/0x560 net/ipv4/ip_input.c:254\n   dst_input include/net/dst.h:469 [inline]\n   ip_rcv_finish net/ipv4/ip_input.c:447 [inline]\n   NF_HOOK include/linux/netfilter.h:317 [inline]\n   NF_HOOK include/linux/netfilter.h:311 [inline]\n   ip_rcv+0x514/0x810 net/ipv4/ip_input.c:567\n   __netif_receive_skb_one_core+0x197/0x1e0 net/core/dev.c:5975\n   __netif_receive_skb+0x1f/0x120 net/core/dev.c:6088\n   process_backlog+0x301/0x1360 net/core/dev.c:6440\n   __napi_poll.constprop.0+0xba/0x550 net/core/dev.c:7453\n   napi_poll net/core/dev.c:7517 [inline]\n   net_rx_action+0xb44/0x1010 net/core/dev.c:7644\n   handle_softirqs+0x1d0/0x770 kernel/softirq.c:579\n   do_softirq+0x3f/0x90 kernel/softirq.c:480\n   </IRQ>\n   <TASK>\n   __local_bh_enable_ip+0xed/0x110 kernel/softirq.c:407\n   local_bh_enable include/linux/bottom_half.h:33 [inline]\n   inet_csk_listen_stop+0x2c5/0x1070 net/ipv4/inet_connection_sock.c:1524\n   mptcp_check_listen_stop.part.0+0x1cc/0x220 net/mptcp/protocol.c:2985\n   mptcp_check_listen_stop net/mptcp/mib.h:118 [inline]\n   __mptcp_close+0x9b9/0xbd0 net/mptcp/protocol.c:3000\n   mptcp_close+0x2f/0x140 net/mptcp/protocol.c:3066\n   inet_release+0xed/0x200 net/ipv4/af_inet.c:435\n   inet6_release+0x4f/0x70 net/ipv6/af_inet6.c:487\n   __sock_release+0xb3/0x270 net/socket.c:649\n   sock_close+0x1c/0x30 net/socket.c:1439\n   __fput+0x402/0xb70 fs/file_table.c:465\n   task_work_run+0x150/0x240 kernel/task_work.c:227\n   resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]\n   exit_to_user_mode_loop+0xd4\n---truncated---","affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0530020a7c8f2204e784f0dbdc882bbd961fdbde"},{"fixed":"5586518bec27666c747cd52aabb62d485686d0bf"},{"fixed":"75a4c9ab8a7af0d76b31ccd1188ed178c38b35d2"},{"fixed":"54999dea879fecb761225e28f274b40662918c30"},{"fixed":"1d82a8fe6ee4afdc92f4e8808c9dad2a6095bbc5"},{"fixed":"f8a1d9b18c5efc76784f5a326e905f641f839894"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"609937aa962a62e93acfc04dd370b665e6152dfb"},{"last_affected":"6654efe264b014d8ea9fc38f79efb568b1b79069"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.228"},{"fixed":"5.11"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.15.169"},{"fixed":"5.16"}]}],"versions":["v5.15.168","v5.10.227","v5.15.167","v5.10.226","v5.15.166","v5.10.225","v5.15.165","v5.10.224","v5.15.164","v5.10.223","v5.15.163","v5.10.222","v5.15.162","v5.10.221","v5.15.161","v5.10.220","v5.10.219","v5.15.160","v5.10.218","v5.15.159","v5.10.217","v5.15.158","v5.10.216","v5.15.157","v5.10.215","v5.15.156","v5.15.155","v5.15.154","v5.10.214","v5.15.153","v5.10.213","v5.15.152","v5.15.151","v5.10.212","v5.15.150","v5.10.211","v5.15.149","v5.10.210","v5.15.148","v5.10.209","v5.15.147","v5.10.208","v5.15.146","v5.10.207","v5.10.206","v5.15.145","v5.10.205","v5.15.144","v5.10.204","v5.15.143","v5.15.142","v5.10.203","v5.15.141","v5.10.202","v5.15.140","v5.15.139","v5.10.201","v5.15.138","v5.10.200","v5.10.199","v5.15.137","v5.15.136","v5.10.198","v5.15.135","v5.15.134","v5.10.197","v5.15.133","v5.15.132","v5.10.196","v5.10.195","v5.15.131","v5.10.194","v5.15.130","v5.10.193","v5.15.129","v5.10.192","v5.15.128","v5.10.191","v5.15.127","v5.15.126","v5.10.190","v5.15.125","v5.10.189","v5.15.124","v5.10.188","v5.15.123","v5.15.122","v5.10.187","v5.10.186","v5.15.121","v5.15.120","v5.15.119","v5.15.118","v5.10.185","v5.15.117","v5.10.184","v5.15.116","v5.10.183","v5.15.115","v5.10.182","v5.15.114","v5.10.181","v5.15.113","v5.10.180","v5.15.112","v5.15.111","v5.10.179","v5.15.110","v5.15.109","v5.15.108","v5.10.178","v5.15.107","v5.10.177","v5.15.106","v5.15.105","v5.10.176","v5.15.104","v5.15.103","v5.10.175","v5.15.102","v5.10.174","v5.15.101","v5.10.173","v5.15.100","v5.10.172","v5.15.99","v5.15.98","v5.15.97","v5.10.171","v5.15.96","v5.10.170","v5.15.95","v5.10.169","v5.15.94","v5.10.168","v5.10.167","v5.15.93","v5.15.92","v5.15.91","v5.10.166","v5.15.90","v5.10.165","v5.15.89","v5.10.164","v5.15.88","v5.10.163","v5.15.87","v5.10.162","v5.15.86","v5.10.161","v5.15.85","v5.15.84","v5.10.160","v5.15.83","v5.10.159","v5.15.82","v5.10.158","v5.15.81","v5.10.157","v5.15.80","v5.10.156","v5.15.79","v5.10.155","v5.15.78","v5.10.154","v5.15.77","v5.10.153","v5.15.76","v5.10.152","v5.10.151","v5.15.75","v5.10.150","v5.10.149","v5.15.74","v5.10.148","v5.15.73","v5.10.147","v5.15.72","v5.15.71","v5.10.146","v5.15.70","v5.10.145","v5.10.144","v5.15.69","v5.15.68","v5.10.143","v5.10.142","v5.15.67","v5.15.66","v5.15.65","v5.10.141","v5.15.64","v5.10.140","v5.15.63","v5.10.139","v5.10.138","v5.15.62","v5.10.137","v5.15.61","v5.10.136","v5.15.60","v5.15.59","v5.10.135","v5.15.58","v5.10.134","v5.15.57","v5.10.133","v5.10.132","v5.15.56","v5.15.55","v5.10.131","v5.10.130","v5.15.54","v5.15.53","v5.10.129","v5.15.52","v5.10.128","v5.15.51","v5.10.127","v5.15.50","v5.10.126","v5.10.125","v5.15.49","v5.10.124","v5.15.48","v5.10.123","v5.15.47","v5.10.122","v5.15.46","v5.10.121","v5.15.45","v5.10.120","v5.15.44","v5.10.119","v5.10.118","v5.15.43","v5.15.42","v5.15.41","v5.10.117","v5.15.40","v5.10.116","v5.15.39","v5.10.115","v5.15.38","v5.10.114","v5.15.37","v5.10.113","v5.15.36","v5.15.35","v5.10.112","v5.15.34","v5.10.111","v5.10.110","v5.15.33","v5.10.109","v5.15.32","v5.15.31","v5.10.108","v5.15.30","v5.10.107","v5.15.29","v5.10.106","v5.15.28","v5.10.105","v5.15.27","v5.10.104","v5.15.26","v5.10.103","v5.15.25","v5.10.102","v5.15.24","v5.10.101","v5.15.23","v5.10.100","v5.15.22","v5.10.99","v5.15.21","v5.10.98","v5.15.20","v5.10.97","v5.15.19","v5.10.96","v5.15.18","v5.10.95","v5.15.17","v5.10.94","v5.15.16","v5.10.93","v5.10.92","v5.15.15","v5.10.91","v5.15.14","v5.15.13","v5.10.90","v5.15.12","v5.10.89","v5.15.11","v5.10.88","v5.15.10","v5.10.87","v5.15.9","v5.10.86","v5.10.85","v5.15.8","v5.10.84","v5.15.7","v5.15","v5.15.6","v5.10.83","v5.10.82","v5.15.5","v5.10.81","v5.15.4","v5.10.80","v5.15.3","v5.15.2","v5.10.79","v5.15.1","v5.10.78","v5.10.77","v5.15-rc2","v5.15-rc1","v5.15-rc4","v5.15-rc7","v5.10.76","v5.15-rc3","v5.15-rc5","v5.10.75","v5.15-rc6","v5.10.74","v5.14","v5.14-rc3","v5.10.73","v5.10.72","v5.10.71","v5.14-rc1","v5.10.70","v5.10.69","v5.10.68","v5.10.67","v5.10.66","v5.10.65","v5.10.64","v5.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