{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43252", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.996Z", "datePublished": "2026-05-06T11:28:42.512Z", "dateUpdated": "2026-05-23T16:06:35.049Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-23T16:06:35.049Z" }, "descriptions": [ { "lang": "en", "value": "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 <0f> 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 \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 <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: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---" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/mptcp/pm_kernel.c" ], "versions": [ { "version": "027cca7029bee685a5ca5c4849be5a2c446ce046", "lessThan": "d90d73ad183566c81320d453a223f610a280f210", "status": "affected", "versionType": "git" }, { "version": "cb24bdcdecba1c60169efb74d88900888df59907", "lessThan": "1b3ff4d88b508b73e2bbddb59356311efb7ba192", "status": "affected", "versionType": "git" }, { "version": "e255683c06df572ead96db5efb5d21be30c0efaa", "lessThan": "7c1d221e475e3d8eb8ed4702392d43f8c5134d1f", "status": "affected", "versionType": "git" }, { "version": "e255683c06df572ead96db5efb5d21be30c0efaa", "lessThan": "7e4d88e36e5d0b8ffda637999cbca64c81701a81", "status": "affected", "versionType": "git" }, { "version": "e255683c06df572ead96db5efb5d21be30c0efaa", "lessThan": "4d480efd98e290c445f4ba476e4dcda5624b1aab", "status": "affected", "versionType": "git" }, { "version": "e255683c06df572ead96db5efb5d21be30c0efaa", "lessThan": "d191101dee25567c2af3b28565f45346c33d65f5", "status": "affected", "versionType": "git" }, { "version": "47a049b38f567a2fbec76bc211ad7ad735519607", "status": "affected", "versionType": "git" }, { "version": "6.1.107", "lessThan": "6.1.167", "status": "affected", "versionType": "semver" }, { "version": "6.6.48", "lessThan": "6.6.130", "status": "affected", "versionType": "semver" }, { "version": "6.10.7", "lessThan": "6.11", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/mptcp/pm_kernel.c" ], "versions": [ { "version": "6.11", "status": "affected" }, { "version": "0", "lessThan": "6.11", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.6", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.107", "versionEndExcluding": "6.1.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.48", "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": "6.18.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.19.6" }, { "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": "6.10.7" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d90d73ad183566c81320d453a223f610a280f210" }, { "url": "https://git.kernel.org/stable/c/1b3ff4d88b508b73e2bbddb59356311efb7ba192" }, { "url": "https://git.kernel.org/stable/c/7c1d221e475e3d8eb8ed4702392d43f8c5134d1f" }, { "url": "https://git.kernel.org/stable/c/7e4d88e36e5d0b8ffda637999cbca64c81701a81" }, { "url": "https://git.kernel.org/stable/c/4d480efd98e290c445f4ba476e4dcda5624b1aab" }, { "url": "https://git.kernel.org/stable/c/d191101dee25567c2af3b28565f45346c33d65f5" } ], "title": "mptcp: pm: in-kernel: always set ID as avail when rm endp", "x_generator": { "engine": "bippy-1.2.0" } } } }