{"id":"CVE-2026-43252","summary":"mptcp: pm: in-kernel: always set ID as avail when rm endp","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: pm: in-kernel: always set ID as avail when rm endp\n\nSyzkaller managed to find a combination of actions that was generating\nthis warning:\n\n  WARNING: net/mptcp/pm_kernel.c:1074 at __mark_subflow_endp_available net/mptcp/pm_kernel.c:1074 [inline], CPU#1: syz.7.48/2535\n  WARNING: net/mptcp/pm_kernel.c:1074 at mptcp_pm_nl_fullmesh net/mptcp/pm_kernel.c:1446 [inline], CPU#1: syz.7.48/2535\n  WARNING: net/mptcp/pm_kernel.c:1074 at mptcp_pm_nl_set_flags_all net/mptcp/pm_kernel.c:1474 [inline], CPU#1: syz.7.48/2535\n  WARNING: net/mptcp/pm_kernel.c:1074 at mptcp_pm_nl_set_flags+0x5de/0x640 net/mptcp/pm_kernel.c:1538, CPU#1: syz.7.48/2535\n  Modules linked in:\n  CPU: 1 UID: 0 PID: 2535 Comm: syz.7.48 Not tainted 6.18.0-03987-gea5f5e676cf5 #17 PREEMPT(voluntary)\n  Hardware name: QEMU Ubuntu 25.10 PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014\n  RIP: 0010:__mark_subflow_endp_available net/mptcp/pm_kernel.c:1074 [inline]\n  RIP: 0010:mptcp_pm_nl_fullmesh net/mptcp/pm_kernel.c:1446 [inline]\n  RIP: 0010:mptcp_pm_nl_set_flags_all net/mptcp/pm_kernel.c:1474 [inline]\n  RIP: 0010:mptcp_pm_nl_set_flags+0x5de/0x640 net/mptcp/pm_kernel.c:1538\n  Code: 89 c7 e8 c5 8c 73 fe e9 f7 fd ff ff 49 83 ef 80 e8 b7 8c 73 fe 4c 89 ff be 03 00 00 00 e8 4a 29 e3 fe eb ac e8 a3 8c 73 fe 90 \u003c0f\u003e 0b 90 e9 3d ff ff ff e8 95 8c 73 fe b8 a1 ff ff ff eb 1a e8 89\n  RSP: 0018:ffffc9001535b820 EFLAGS: 00010287\n  netdevsim0: tun_chr_ioctl cmd 1074025677\n  RAX: ffffffff82da294d RBX: 0000000000000001 RCX: 0000000000080000\n  RDX: ffffc900096d0000 RSI: 00000000000006d6 RDI: 00000000000006d7\n  netdevsim0: linktype set to 823\n  RBP: ffff88802cdb2240 R08: 00000000000104ae R09: ffffffffffffffff\n  R10: ffffffff82da27d4 R11: 0000000000000000 R12: 0000000000000000\n  R13: ffff88801246d8c0 R14: ffffc9001535b8b8 R15: ffff88802cdb1800\n  FS:  00007fc6ac5a76c0(0000) GS:ffff8880f90c8000(0000) knlGS:0000000000000000\n  netlink: 'syz.3.50': attribute type 5 has an invalid length.\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  netlink: 1232 bytes leftover after parsing attributes in process `syz.3.50'.\n  CR2: 0000200000010000 CR3: 0000000025b1a000 CR4: 0000000000350ef0\n  Call Trace:\n   \u003cTASK\u003e\n   mptcp_pm_set_flags net/mptcp/pm_netlink.c:277 [inline]\n   mptcp_pm_nl_set_flags_doit+0x1d7/0x210 net/mptcp/pm_netlink.c:282\n   genl_family_rcv_msg_doit+0x117/0x180 net/netlink/genetlink.c:1115\n   genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]\n   genl_rcv_msg+0x3a8/0x3f0 net/netlink/genetlink.c:1210\n   netlink_rcv_skb+0x16d/0x240 net/netlink/af_netlink.c:2550\n   genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219\n   netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]\n   netlink_unicast+0x3e9/0x4c0 net/netlink/af_netlink.c:1344\n   netlink_sendmsg+0x4ab/0x5b0 net/netlink/af_netlink.c:1894\n   sock_sendmsg_nosec net/socket.c:718 [inline]\n   __sock_sendmsg+0xc9/0xf0 net/socket.c:733\n   ____sys_sendmsg+0x272/0x3b0 net/socket.c:2608\n   ___sys_sendmsg+0x2de/0x320 net/socket.c:2662\n   __sys_sendmsg net/socket.c:2694 [inline]\n   __do_sys_sendmsg net/socket.c:2699 [inline]\n   __se_sys_sendmsg net/socket.c:2697 [inline]\n   __x64_sys_sendmsg+0x110/0x1a0 net/socket.c:2697\n   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n   do_syscall_64+0xed/0x360 arch/x86/entry/syscall_64.c:94\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\n  RIP: 0033:0x7fc6adb66f6d\n  Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48\n  RSP: 002b:00007fc6ac5a6ff8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\n  RAX: ffffffffffffffda RBX: 00007fc6addf5fa0 RCX: 00007fc6adb66f6d\n  RDX: 0000000000048084 RSI: 00002000000002c0 RDI: 000000000000000e\n  RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000\n  R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000\n---truncated---","modified":"2026-07-15T01:49:09.944854030Z","published":"2026-05-06T11:28:42.512Z","related":["SUSE-SU-2026:22043-1","SUSE-SU-2026:22048-1","SUSE-SU-2026:22076-1","SUSE-SU-2026:22087-1","SUSE-SU-2026:22108-1","SUSE-SU-2026:22137-1","SUSE-SU-2026:22433-1","SUSE-SU-2026:22458-1","SUSE-SU-2026:2482-1","SUSE-SU-2026:2591-1","openSUSE-SU-2026:20912-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43252.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1b3ff4d88b508b73e2bbddb59356311efb7ba192"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4d480efd98e290c445f4ba476e4dcda5624b1aab"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7c1d221e475e3d8eb8ed4702392d43f8c5134d1f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7e4d88e36e5d0b8ffda637999cbca64c81701a81"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d191101dee25567c2af3b28565f45346c33d65f5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d90d73ad183566c81320d453a223f610a280f210"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43252.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43252"},{"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":"027cca7029bee685a5ca5c4849be5a2c446ce046"},{"fixed":"d90d73ad183566c81320d453a223f610a280f210"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"cb24bdcdecba1c60169efb74d88900888df59907"},{"fixed":"1b3ff4d88b508b73e2bbddb59356311efb7ba192"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e255683c06df572ead96db5efb5d21be30c0efaa"},{"fixed":"7c1d221e475e3d8eb8ed4702392d43f8c5134d1f"},{"fixed":"7e4d88e36e5d0b8ffda637999cbca64c81701a81"},{"fixed":"4d480efd98e290c445f4ba476e4dcda5624b1aab"},{"fixed":"d191101dee25567c2af3b28565f45346c33d65f5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"47a049b38f567a2fbec76bc211ad7ad735519607"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.1.107"},{"fixed":"6.1.167"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.48"},{"fixed":"6.6.130"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.10.7"},{"fixed":"6.11"}]}],"versions":["v6.1.166","v6.1.165","v6.1.164","v6.1.163","v6.1.162","v6.1.161","v6.1.160","v6.1.159","v6.1.158","v6.1.157","v6.1.156","v6.1.155","v6.1.154","v6.1.153","v6.1.152","v6.1.151","v6.1.150","v6.1.149","v6.1.148","v6.1.147","v6.1.146","v6.1.145","v6.1.144","v6.1.143","v6.1.142","v6.1.141","v6.1.140","v6.1.139","v6.1.138","v6.1.137","v6.1.136","v6.1.135","v6.1.134","v6.1.133","v6.1.132","v6.1.131","v6.1.130","v6.1.129","v6.1.128","v6.1.127","v6.1.126","v6.1.125","v6.1.124","v6.1.123","v6.1.122","v6.1.121","v6.1.120","v6.1.119","v6.1.118","v6.1.117","v6.1.116","v6.1.115","v6.1.114","v6.1.113","v6.1.112","v6.1.111","v6.1.110","v6.1.109","v6.1.108","v6.1.107","v6.6.129","v6.6.128","v6.6.127","v6.6.126","v6.6.125","v6.6.124","v6.6.123","v6.6.122","v6.6.121","v6.6.120","v6.6.119","v6.6.118","v6.6.117","v6.6.116","v6.6.115","v6.6.114","v6.6.113","v6.6.112","v6.6.111","v6.6.110","v6.6.109","v6.6.108","v6.6.107","v6.6.106","v6.6.105","v6.6.104","v6.6.103","v6.6.102","v6.6.101","v6.6.100","v6.6.99","v6.6.98","v6.6.97","v6.6.96","v6.6.95","v6.6.94","v6.6.93","v6.6.92","v6.6.91","v6.6.90","v6.6.89","v6.6.88","v6.6.87","v6.6.86","v6.6.85","v6.6.84","v6.6.83","v6.6.82","v6.6.81","v6.6.80","v6.6.79","v6.6.78","v6.6.77","v6.6.76","v6.6.75","v6.6.74","v6.6.73","v6.6.72","v6.6.71","v6.6.70","v6.6.69","v6.6.68","v6.6.67","v6.6.66","v6.6.65","v6.6.64","v6.6.63","v6.6.62","v6.6.61","v6.6.60","v6.6.59","v6.6.58","v6.6.57","v6.6.56","v6.6.55","v6.6.54","v6.6.53","v6.6.52","v6.6.51","v6.6.50","v6.6.49","v6.6.48","v6.10-rc1","v6.10.6","v6.10","v6.10.5","v6.10.4","v6.10.3","v6.10.2","v6.10.1","v6.10-rc6","v6.10-rc7","v6.10-rc3","v6.9-rc1","v6.10-rc5","v6.10-rc2","v6.10-rc4","v6.9","v6.9-rc6","v6.9-rc7","v6.9-rc5","v6.9-rc3","v6.9-rc2","v6.8","v6.9-rc4","v6.8-rc1","v6.7-rc1","v6.8-rc7","v6.8-rc6","v6.8-rc5","v6.8-rc4","v6.8-rc3","v6.8-rc2","v6.7","v6.7-rc3","v6.7-rc8","v6.7-rc7","v6.7-rc6","v6.7-rc2","v6.7-rc4","v6.7-rc5","v6.6","v6.6-rc1","v6.6-rc5","v6.6-rc3","v6.6-rc7","v6.6-rc6","v6.6-rc4","v6.6-rc2","v6.5","v6.5-rc1","v6.5-rc2","v6.5-rc7","v6.5-rc4","v6.5-rc3","v6.5-rc6","v6.5-rc5","v6.4","v6.4-rc7","v6.4-rc1","v6.4-rc6","v6.4-rc5","v6.4-rc3"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