{"id":"CVE-2026-23321","state":"PUBLISHED","title":"mptcp: pm: in-kernel: always mark signal+subflow endp as used","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: pm: in-kernel: always mark signal+subflow endp as used\n\nSyzkaller managed to find a combination of actions that was generating\nthis warning:\n\n  msk->pm.local_addr_used == 0\n  WARNING: net/mptcp/pm_kernel.c:1071 at __mark_subflow_endp_available net/mptcp/pm_kernel.c:1071 [inline], CPU#1: syz.2.17/961\n  WARNING: net/mptcp/pm_kernel.c:1071 at mptcp_nl_remove_subflow_and_signal_addr net/mptcp/pm_kernel.c:1103 [inline], CPU#1: syz.2.17/961\n  WARNING: net/mptcp/pm_kernel.c:1071 at mptcp_pm_nl_del_addr_doit+0x81d/0x8f0 net/mptcp/pm_kernel.c:1210, CPU#1: syz.2.17/961\n  Modules linked in:\n  CPU: 1 UID: 0 PID: 961 Comm: syz.2.17 Not tainted 6.19.0-08368-gfafda3b4b06b #22 PREEMPT(full)\n  Hardware name: QEMU Ubuntu 25.10 PC v2 (i440FX + PIIX, + 10.1 machine, 1996), BIOS 1.17.0-debian-1.17.0-1build1 04/01/2014\n  RIP: 0010:__mark_subflow_endp_available net/mptcp/pm_kernel.c:1071 [inline]\n  RIP: 0010:mptcp_nl_remove_subflow_and_signal_addr net/mptcp/pm_kernel.c:1103 [inline]\n  RIP: 0010:mptcp_pm_nl_del_addr_doit+0x81d/0x8f0 net/mptcp/pm_kernel.c:1210\n  Code: 89 c5 e8 46 30 6f fe e9 21 fd ff ff 49 83 ed 80 e8 38 30 6f fe 4c 89 ef be 03 00 00 00 e8 db 49 df fe eb ac e8 24 30 6f fe 90 <0f> 0b 90 e9 1d ff ff ff e8 16 30 6f fe eb 05 e8 0f 30 6f fe e8 9a\n  RSP: 0018:ffffc90001663880 EFLAGS: 00010293\n  RAX: ffffffff82de1a6c RBX: 0000000000000000 RCX: ffff88800722b500\n  RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000\n  RBP: ffff8880158b22d0 R08: 0000000000010425 R09: ffffffffffffffff\n  R10: ffffffff82de18ba R11: 0000000000000000 R12: ffff88800641a640\n  R13: ffff8880158b1880 R14: ffff88801ec3c900 R15: ffff88800641a650\n  FS:  00005555722c3500(0000) GS:ffff8880f909d000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f66346e0f60 CR3: 000000001607c000 CR4: 0000000000350ef0\n  Call Trace:\n   <TASK>\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+0x4aa/0x5b0 net/netlink/af_netlink.c:1894\n   sock_sendmsg_nosec net/socket.c:727 [inline]\n   __sock_sendmsg+0xc9/0xf0 net/socket.c:742\n   ____sys_sendmsg+0x272/0x3b0 net/socket.c:2592\n   ___sys_sendmsg+0x2de/0x320 net/socket.c:2646\n   __sys_sendmsg net/socket.c:2678 [inline]\n   __do_sys_sendmsg net/socket.c:2683 [inline]\n   __se_sys_sendmsg net/socket.c:2681 [inline]\n   __x64_sys_sendmsg+0x110/0x1a0 net/socket.c:2681\n   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n   do_syscall_64+0x143/0x440 arch/x86/entry/syscall_64.c:94\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\n  RIP: 0033:0x7f66346f826d\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 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48\n  RSP: 002b:00007ffc83d8bdc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\n  RAX: ffffffffffffffda RBX: 00007f6634985fa0 RCX: 00007f66346f826d\n  RDX: 00000000040000b0 RSI: 0000200000000740 RDI: 0000000000000007\n  RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000\n  R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6634985fa8\n  R13: 00007f6634985fac R14: 0000000000000000 R15: 0000000000001770\n   </TASK>\n\nThe actions that caused that seem to be:\n\n - Set the MPTCP subflows limit to 0\n - Create an MPTCP endpoint with both the 'signal' and 'subflow' flags\n - Create a new MPTCP connection from a different address: an ADD_ADDR\n   linked to the MPTCP endpoint will be sent ('signal' flag), but no\n   subflows is initiated ('subflow' flag)\n - Remove the MPTCP endpoint\n\n---truncated---","publishedAt":"2026-03-25T10:27:15.125Z","updatedAt":"2026-10-15T01:14:04.247Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d93cf38fad9f66397093432b8917971a92ee0146","status":"affected","lessThan":"c5c877e140e5f46023a74a51e577ce5edd0a4be7","versionType":"git"},{"version":"64815ba15880ce5f99df075fa4104fef170ac7e5","status":"affected","lessThan":"05799c2f1ca5eb13d65764dda688d02021b65e06","versionType":"git"},{"version":"85df533a787bf07bf4367ce2a02b822ff1fba1a3","status":"affected","lessThan":"67f34ab318807989b57dfdb0f79e2d4e57018290","versionType":"git"},{"version":"85df533a787bf07bf4367ce2a02b822ff1fba1a3","status":"affected","lessThan":"a64aa7db39392add5be09dffaedbf1f0ce5554df","versionType":"git"},{"version":"85df533a787bf07bf4367ce2a02b822ff1fba1a3","status":"affected","lessThan":"198824ccfa64ffebd918bf99c939bd8170a4a4d8","versionType":"git"},{"version":"85df533a787bf07bf4367ce2a02b822ff1fba1a3","status":"affected","lessThan":"579a752464a64cb5f9139102f0e6b90a1f595ceb","versionType":"git"},{"version":"0f21cc29bc13e86512621727a4388c8a7ad2716b","status":"affected","versionType":"git"},{"version":"6.1.106","status":"affected","lessThan":"6.1.167","versionType":"semver"},{"version":"6.6.46","status":"affected","lessThan":"6.6.130","versionType":"semver"},{"version":"6.10.5","status":"affected","lessThan":"6.11","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mptcp/pm_kernel.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.11","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.78","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.17","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.7","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mptcp/pm_kernel.c"]}],"references":["https://git.kernel.org/stable/c/c5c877e140e5f46023a74a51e577ce5edd0a4be7","https://git.kernel.org/stable/c/05799c2f1ca5eb13d65764dda688d02021b65e06","https://git.kernel.org/stable/c/67f34ab318807989b57dfdb0f79e2d4e57018290","https://git.kernel.org/stable/c/a64aa7db39392add5be09dffaedbf1f0ce5554df","https://git.kernel.org/stable/c/198824ccfa64ffebd918bf99c939bd8170a4a4d8","https://git.kernel.org/stable/c/579a752464a64cb5f9139102f0e6b90a1f595ceb","https://cert-portal.siemens.com/productcert/html/ssa-082556.html","https://cert-portal.siemens.com/productcert/html/ssa-019113.html","https://cert-portal.siemens.com/productcert/html/ssa-457936.html","https://cert-portal.siemens.com/productcert/html/ssa-784472.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23321.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23321","state":"PUBLISHED","datePublished":"2026-03-25T10:27:15.125Z","dateUpdated":"2026-10-15T01:14:04.247Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:45.996Z"},"containers":{"cna":{"title":"mptcp: pm: in-kernel: always mark signal+subflow endp as used","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: pm: in-kernel: always mark signal+subflow endp as used\n\nSyzkaller managed to find a combination of actions that was generating\nthis warning:\n\n  msk->pm.local_addr_used == 0\n  WARNING: net/mptcp/pm_kernel.c:1071 at __mark_subflow_endp_available net/mptcp/pm_kernel.c:1071 [inline], CPU#1: syz.2.17/961\n  WARNING: net/mptcp/pm_kernel.c:1071 at mptcp_nl_remove_subflow_and_signal_addr net/mptcp/pm_kernel.c:1103 [inline], CPU#1: syz.2.17/961\n  WARNING: net/mptcp/pm_kernel.c:1071 at mptcp_pm_nl_del_addr_doit+0x81d/0x8f0 net/mptcp/pm_kernel.c:1210, CPU#1: syz.2.17/961\n  Modules linked in:\n  CPU: 1 UID: 0 PID: 961 Comm: syz.2.17 Not tainted 6.19.0-08368-gfafda3b4b06b #22 PREEMPT(full)\n  Hardware name: QEMU Ubuntu 25.10 PC v2 (i440FX + PIIX, + 10.1 machine, 1996), BIOS 1.17.0-debian-1.17.0-1build1 04/01/2014\n  RIP: 0010:__mark_subflow_endp_available net/mptcp/pm_kernel.c:1071 [inline]\n  RIP: 0010:mptcp_nl_remove_subflow_and_signal_addr net/mptcp/pm_kernel.c:1103 [inline]\n  RIP: 0010:mptcp_pm_nl_del_addr_doit+0x81d/0x8f0 net/mptcp/pm_kernel.c:1210\n  Code: 89 c5 e8 46 30 6f fe e9 21 fd ff ff 49 83 ed 80 e8 38 30 6f fe 4c 89 ef be 03 00 00 00 e8 db 49 df fe eb ac e8 24 30 6f fe 90 <0f> 0b 90 e9 1d ff ff ff e8 16 30 6f fe eb 05 e8 0f 30 6f fe e8 9a\n  RSP: 0018:ffffc90001663880 EFLAGS: 00010293\n  RAX: ffffffff82de1a6c RBX: 0000000000000000 RCX: ffff88800722b500\n  RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000\n  RBP: ffff8880158b22d0 R08: 0000000000010425 R09: ffffffffffffffff\n  R10: ffffffff82de18ba R11: 0000000000000000 R12: ffff88800641a640\n  R13: ffff8880158b1880 R14: ffff88801ec3c900 R15: ffff88800641a650\n  FS:  00005555722c3500(0000) GS:ffff8880f909d000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f66346e0f60 CR3: 000000001607c000 CR4: 0000000000350ef0\n  Call Trace:\n   <TASK>\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+0x4aa/0x5b0 net/netlink/af_netlink.c:1894\n   sock_sendmsg_nosec net/socket.c:727 [inline]\n   __sock_sendmsg+0xc9/0xf0 net/socket.c:742\n   ____sys_sendmsg+0x272/0x3b0 net/socket.c:2592\n   ___sys_sendmsg+0x2de/0x320 net/socket.c:2646\n   __sys_sendmsg net/socket.c:2678 [inline]\n   __do_sys_sendmsg net/socket.c:2683 [inline]\n   __se_sys_sendmsg net/socket.c:2681 [inline]\n   __x64_sys_sendmsg+0x110/0x1a0 net/socket.c:2681\n   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n   do_syscall_64+0x143/0x440 arch/x86/entry/syscall_64.c:94\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\n  RIP: 0033:0x7f66346f826d\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 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48\n  RSP: 002b:00007ffc83d8bdc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\n  RAX: ffffffffffffffda RBX: 00007f6634985fa0 RCX: 00007f66346f826d\n  RDX: 00000000040000b0 RSI: 0000200000000740 RDI: 0000000000000007\n  RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000\n  R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6634985fa8\n  R13: 00007f6634985fac R14: 0000000000000000 R15: 0000000000001770\n   </TASK>\n\nThe actions that caused that seem to be:\n\n - Set the MPTCP subflows limit to 0\n - Create an MPTCP endpoint with both the 'signal' and 'subflow' flags\n - Create a new MPTCP connection from a different address: an ADD_ADDR\n   linked to the MPTCP endpoint will be sent ('signal' flag), but no\n   subflows is initiated ('subflow' flag)\n - Remove the MPTCP endpoint\n\n---truncated---"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d93cf38fad9f66397093432b8917971a92ee0146","status":"affected","lessThan":"c5c877e140e5f46023a74a51e577ce5edd0a4be7","versionType":"git"},{"version":"64815ba15880ce5f99df075fa4104fef170ac7e5","status":"affected","lessThan":"05799c2f1ca5eb13d65764dda688d02021b65e06","versionType":"git"},{"version":"85df533a787bf07bf4367ce2a02b822ff1fba1a3","status":"affected","lessThan":"67f34ab318807989b57dfdb0f79e2d4e57018290","versionType":"git"},{"version":"85df533a787bf07bf4367ce2a02b822ff1fba1a3","status":"affected","lessThan":"a64aa7db39392add5be09dffaedbf1f0ce5554df","versionType":"git"},{"version":"85df533a787bf07bf4367ce2a02b822ff1fba1a3","status":"affected","lessThan":"198824ccfa64ffebd918bf99c939bd8170a4a4d8","versionType":"git"},{"version":"85df533a787bf07bf4367ce2a02b822ff1fba1a3","status":"affected","lessThan":"579a752464a64cb5f9139102f0e6b90a1f595ceb","versionType":"git"},{"version":"0f21cc29bc13e86512621727a4388c8a7ad2716b","status":"affected","versionType":"git"},{"version":"6.1.106","status":"affected","lessThan":"6.1.167","versionType":"semver"},{"version":"6.6.46","status":"affected","lessThan":"6.6.130","versionType":"semver"},{"version":"6.10.5","status":"affected","lessThan":"6.11","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mptcp/pm_kernel.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.11","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.78","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.17","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.7","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mptcp/pm_kernel.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/c5c877e140e5f46023a74a51e577ce5edd0a4be7"},{"url":"https://git.kernel.org/stable/c/05799c2f1ca5eb13d65764dda688d02021b65e06"},{"url":"https://git.kernel.org/stable/c/67f34ab318807989b57dfdb0f79e2d4e57018290"},{"url":"https://git.kernel.org/stable/c/a64aa7db39392add5be09dffaedbf1f0ce5554df"},{"url":"https://git.kernel.org/stable/c/198824ccfa64ffebd918bf99c939bd8170a4a4d8"},{"url":"https://git.kernel.org/stable/c/579a752464a64cb5f9139102f0e6b90a1f595ceb"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-23T16:04:34.546Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.106","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.46","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"6.12.78"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"6.18.17"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"6.19.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"7.0"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10.5"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"affected":[{"vendor":"Siemens","product":"SIMATIC 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MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.7","status":"affected","lessThan":"*","versionType":"custom"}]}],"references":[{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}],"providerMetadata":{"shortName":"siemens-SADP","orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","dateUpdated":"2026-10-15T01:14:04.247Z"},"x_adpType":"supplier"}]}}}