{"cve":"CVE-2022-50531","nvd":{"published":"2025-10-07T16:15:37.143","modified":"2026-06-17T05:23:44.140","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix an information leak in tipc_topsrv_kern_subscr\n\nUse a 8-byte write to initialize sub.usr_handle in\ntipc_topsrv_kern_subscr(), otherwise four bytes remain uninitialized\nwhen issuing setsockopt(..., SOL_TIPC, ...).\nThis resulted in an infoleak reported by KMSAN when the packet was\nreceived:\n\n  =====================================================\n  BUG: KMSAN: kernel-infoleak in copyout+0xbc/0x100 lib/iov_iter.c:169\n   instrument_copy_to_user ./include/linux/instrumented.h:121\n   copyout+0xbc/0x100 lib/iov_iter.c:169\n   _copy_to_iter+0x5c0/0x20a0 lib/iov_iter.c:527\n   copy_to_iter ./include/linux/uio.h:176\n   simple_copy_to_iter+0x64/0xa0 net/core/datagram.c:513\n   __skb_datagram_iter+0x123/0xdc0 net/core/datagram.c:419\n   skb_copy_datagram_iter+0x58/0x200 net/core/datagram.c:527\n   skb_copy_datagram_msg ./include/linux/skbuff.h:3903\n   packet_recvmsg+0x521/0x1e70 net/packet/af_packet.c:3469\n   ____sys_recvmsg+0x2c4/0x810 net/socket.c:?\n   ___sys_recvmsg+0x217/0x840 net/socket.c:2743\n   __sys_recvmsg net/socket.c:2773\n   __do_sys_recvmsg net/socket.c:2783\n   __se_sys_recvmsg net/socket.c:2780\n   __x64_sys_recvmsg+0x364/0x540 net/socket.c:2780\n   do_syscall_x64 arch/x86/entry/common.c:50\n   do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80\n   entry_SYSCALL_64_after_hwframe+0x63/0xcd arch/x86/entry/entry_64.S:120\n\n  ...\n\n  Uninit was stored to memory at:\n   tipc_sub_subscribe+0x42d/0xb50 net/tipc/subscr.c:156\n   tipc_conn_rcv_sub+0x246/0x620 net/tipc/topsrv.c:375\n   tipc_topsrv_kern_subscr+0x2e8/0x400 net/tipc/topsrv.c:579\n   tipc_group_create+0x4e7/0x7d0 net/tipc/group.c:190\n   tipc_sk_join+0x2a8/0x770 net/tipc/socket.c:3084\n   tipc_setsockopt+0xae5/0xe40 net/tipc/socket.c:3201\n   __sys_setsockopt+0x87f/0xdc0 net/socket.c:2252\n   __do_sys_setsockopt net/socket.c:2263\n   __se_sys_setsockopt net/socket.c:2260\n   __x64_sys_setsockopt+0xe0/0x160 net/socket.c:2260\n   do_syscall_x64 arch/x86/entry/common.c:50\n   do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80\n   entry_SYSCALL_64_after_hwframe+0x63/0xcd arch/x86/entry/entry_64.S:120\n\n  Local variable sub created at:\n   tipc_topsrv_kern_subscr+0x57/0x400 net/tipc/topsrv.c:562\n   tipc_group_create+0x4e7/0x7d0 net/tipc/group.c:190\n\n  Bytes 84-87 of 88 are uninitialized\n  Memory access of size 88 starts at ffff88801ed57cd0\n  Data copied to user address 0000000020000400\n  ...\n  =====================================================","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-401"],"references":["https://git.kernel.org/stable/c/3d1b83ff7b6575a4e41283203e6b2e25ea700cd7","https://git.kernel.org/stable/c/567f8de358b61015dcfb8878a1f06c5369a45f54","https://git.kernel.org/stable/c/777ecaabd614d47c482a5c9031579e66da13989a","https://git.kernel.org/stable/c/dbc01c0a4e202a7e925dad1d4b7c1d6eb0c81154","https://git.kernel.org/stable/c/e558e148938442dd49628cd7ef61c360832bef31"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:11:26.888974865+00:00"},"epss":{"cve":"CVE-2022-50531","score":0.0016,"percentile":0.05107,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}