{"id":"CVE-2026-43029","summary":"mptcp: fix soft lockup in mptcp_recvmsg()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix soft lockup in mptcp_recvmsg()\n\nsyzbot reported a soft lockup in mptcp_recvmsg() [0].\n\nWhen receiving data with MSG_PEEK | MSG_WAITALL flags, the skb is not\nremoved from the sk_receive_queue. This causes sk_wait_data() to always\nfind available data and never perform actual waiting, leading to a soft\nlockup.\n\nFix this by adding a 'last' parameter to track the last peeked skb.\nThis allows sk_wait_data() to make informed waiting decisions and prevent\ninfinite loops when MSG_PEEK is used.\n\n[0]:\nwatchdog: BUG: soft lockup - CPU#2 stuck for 156s! [server:1963]\nModules linked in:\nCPU: 2 UID: 0 PID: 1963 Comm: server Not tainted 6.19.0-rc8 #61 PREEMPT(none)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\nRIP: 0010:sk_wait_data+0x15/0x190\nCode: 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 56 41 55 41 54 49 89 f4 55 48 89 d5 53 48 89 fb \u003c48\u003e 83 ec 30 65 48 8b 05 17 a4 6b 01 48 89 44 24 28 31 c0 65 48 8b\nRSP: 0018:ffffc90000603ca0 EFLAGS: 00000246\nRAX: 0000000000000000 RBX: ffff888102bf0800 RCX: 0000000000000001\nRDX: 0000000000000000 RSI: ffffc90000603d18 RDI: ffff888102bf0800\nRBP: 0000000000000000 R08: 0000000000000002 R09: 0000000000000101\nR10: 0000000000000000 R11: 0000000000000075 R12: ffffc90000603d18\nR13: ffff888102bf0800 R14: ffff888102bf0800 R15: 0000000000000000\nFS:  00007f6e38b8c4c0(0000) GS:ffff8881b877e000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 000055aa7bff1680 CR3: 0000000105cbe000 CR4: 00000000000006f0\nCall Trace:\n \u003cTASK\u003e\n mptcp_recvmsg+0x547/0x8c0 net/mptcp/protocol.c:2329\n inet_recvmsg+0x11f/0x130 net/ipv4/af_inet.c:891\n sock_recvmsg+0x94/0xc0 net/socket.c:1100\n __sys_recvfrom+0xb2/0x130 net/socket.c:2256\n __x64_sys_recvfrom+0x1f/0x30 net/socket.c:2267\n do_syscall_64+0x59/0x2d0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x76/0x7e arch/x86/entry/entry_64.S:131\nRIP: 0033:0x7f6e386a4a1d\nCode: 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 8d 05 f1 de 2c 00 41 89 ca 8b 00 85 c0 75 20 45 31 c9 45 31 c0 b8 2d 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 6b f3 c3 66 0f 1f 84 00 00 00 00 00 41 56 41\nRSP: 002b:00007ffc3c4bb078 EFLAGS: 00000246 ORIG_RAX: 000000000000002d\nRAX: ffffffffffffffda RBX: 000000000000861e RCX: 00007f6e386a4a1d\nRDX: 00000000000003ff RSI: 00007ffc3c4bb150 RDI: 0000000000000004\nRBP: 00007ffc3c4bb570 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000103 R11: 0000000000000246 R12: 00005605dbc00be0\nR13: 00007ffc3c4bb650 R14: 0000000000000000 R15: 0000000000000000\n \u003c/TASK\u003e","modified":"2026-07-15T01:49:21.494651241Z","published":"2026-05-01T14:15:29.885Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43029.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/58b58b9ba89c43914eea90c18928e51852d10c24"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5dd8025a49c268ab6b94d978532af3ad341132a7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/de3c248d1b69eaefa2d5b3da4005936dcf590f1b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43029.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43029"},{"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":"8e04ce45a8db7a080220e86e249198fa676b83dc"},{"fixed":"58b58b9ba89c43914eea90c18928e51852d10c24"},{"fixed":"de3c248d1b69eaefa2d5b3da4005936dcf590f1b"},{"fixed":"5dd8025a49c268ab6b94d978532af3ad341132a7"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"49888b3b457b801282b44c246d289c56e2f2a55b"},{"last_affected":"0206a9341e652167c610dcd79f3d4e9e8153984c"},{"last_affected":"7d6d10eee01edc9c20850ea75cf8273dc1170921"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.117"},{"fixed":"6.7"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.12.59"},{"fixed":"6.13"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.17.8"},{"fixed":"6.18"}]}],"versions":["v6.12.58","v6.6.116","v6.17.7","v6.12.57","v6.17.6","v6.12.56","v6.6.115","v6.17.5","v6.12.55","v6.6.114","v6.17.4","v6.12.54","v6.6.113","v6.17.3","v6.12.53","v6.6.112","v6.17.2","v6.12.52","v6.6.111","v6.17.1","v6.12.51","v6.6.110","v6.17","v6.17-rc7","v6.12.50","v6.6.109","v6.17-rc1","v6.17-rc2","v6.12.49","v6.6.108","v6.17-rc6","v6.17-rc4","v6.17-rc5","v6.17-rc3","v6.16","v6.12.48","v6.6.107","v6.12.47","v6.6.106","v6.12.46","v6.6.105","v6.12.45","v6.6.104","v6.12.44","v6.6.103","v6.12.43","v6.6.102","v6.12.42","v6.12.41","v6.6.101","v6.16-rc6","v6.12.40","v6.6.100","v6.16-rc1","v6.16-rc4","v6.16-rc2","v6.16-rc5","v6.16-rc7","v6.16-rc3","v6.12.39","v6.6.99","v6.14-rc3","v6.12.38","v6.6.98","v6.12.37","v6.6.97","v6.12.36","v6.6.96","v6.12.35","v6.6.95","v6.12.34","v6.6.94","v6.12.33","v6.6.93","v6.15","v6.12.32","v6.15-rc1","v6.15-rc6","v6.15-rc3","v6.12.31","v6.6.92","v6.12.30","v6.15-rc2","v6.15-rc7","v6.15-rc4","v6.12.29","v6.6.91","v6.12.28","v6.6.90","v6.15-rc5","v6.12.27","v6.6.89","v6.12.26","v6.14","v6.12.25","v6.6.88","v6.12.24","v6.6.87","v6.12.23","v6.12.22","v6.6.86","v6.12.21","v6.6.85","v6.14-rc1","v6.14-rc7","v6.14-rc6","v6.12.20","v6.6.84","v6.14-rc4","v6.14-rc5","v6.12.19","v6.6.83","v6.14-rc2","v6.12.18","v6.6.82","v6.6.81","v6.12.17","v6.6.80","v6.12.16","v6.6.79","v6.12.15","v6.6.78","v6.13","v6.12.14","v6.13-rc1","v6.12.13","v6.6.77","v6.6.76","v6.12.12","v6.6.75","v6.12.11","v6.6.74","v6.13-rc6","v6.12.10","v6.6.73","v6.6.72","v6.13-rc7","v6.13-rc2","v6.12.9","v6.6.71","v6.13-rc5","v6.13-rc3","v6.6.70","v6.12.8","v6.6.69","v6.12-rc1","v6.13-rc4","v6.12.7","v6.6.68","v6.12.6","v6.6.67","v6.12.5","v6.6.66","v6.12.4","v6.6.65","v6.6.64","v6.12","v6.12.3","v6.6.63","v6.12.2","v6.12.1","v6.12-rc7","v6.6.62","v6.6.61","v6.12-rc3","v6.6.60","v6.12-rc4","v6.12-rc6","v6.12-rc5","v6.6.59","v6.12-rc2","v6.6.58","v6.6.57","v6.11-rc1","v6.6.56","v6.11-rc5","v6.6.55","v6.6.54","v6.11","v6.6.53","v6.6.52","v6.11-rc7","v6.6.51","v6.10-rc1","v6.11-rc6","v6.11-rc3","v6.6.50","v6.11-rc4","v6.6.49","v6.11-rc2","v6.6.48","v6.6.47","v6.10","v6.6.46","v6.6.45","v6.6.44","v6.6.43","v6.6.42","v6.6.41","v6.10-rc6","v6.6.40","v6.10-rc7","v6.6.39","v6.10-rc3","v6.9-rc1","v6.6.38","v6.10-rc5","v6.10-rc2","v6.6.37","v6.6.36","v6.10-rc4","v6.6.35","v6.9","v6.6.34","v6.6.33","v6.6.32","v6.6.31","v6.6.30","v6.9-rc6","v6.9-rc7","v6.9-rc5","v6.9-rc3","v6.9-rc2","v6.8","v6.9-rc4","v6.6.29","v6.6.28","v6.8-rc1","v6.6.27","v6.6.26","v6.6.25","v6.6.24","v6.6.23","v6.6.22","v6.7-rc1","v6.8-rc7","v6.6.21","v6.8-rc6","v6.8-rc5","v6.8-rc4","v6.8-rc3","v6.8-rc2","v6.6.20","v6.6.19","v6.6.18","v6.6.17","v6.6.16","v6.6.15","v6.6.14","v6.6.13","v6.7","v6.6.12","v6.7-rc3","v6.7-rc8","v6.6.11","v6.7-rc7","v6.6.10","v6.6.9","v6.7-rc6","v6.6.8","v6.7-rc2","v6.6.7","v6.7-rc4","v6.7-rc5","v6.6.6","v6.6.5","v6.6.4","v6.6","v6.6.3","v6.6.2","v6.6.1","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-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