CVE-2022-50531tipc: fix an information leak in tipc_topsrv_kern_subscr

Description

In the Linux kernel, the following vulnerability has been resolved: tipc: fix an information leak in tipc_topsrv_kern_subscr Use a 8-byte write to initialize sub.usr_handle in tipc_topsrv_kern_subscr(), otherwise four bytes remain uninitialized when issuing setsockopt(..., SOL_TIPC, ...). This resulted in an infoleak reported by KMSAN when the packet was received: ===================================================== BUG: KMSAN: kernel-infoleak in copyout+0xbc/0x100 lib/iov_iter.c:169 instrument_copy_to_user ./include/linux/instrumented.h:121 copyout+0xbc/0x100 lib/iov_iter.c:169 _copy_to_iter+0x5c0/0x20a0 lib/iov_iter.c:527 copy_to_iter ./include/linux/uio.h:176 simple_copy_to_iter+0x64/0xa0 net/core/datagram.c:513 __skb_datagram_iter+0x123/0xdc0 net/core/datagram.c:419 skb_copy_datagram_iter+0x58/0x200 net/core/datagram.c:527 skb_copy_datagram_msg ./include/linux/skbuff.h:3903 packet_recvmsg+0x521/0x1e70 net/packet/af_packet.c:3469 ____sys_recvmsg+0x2c4/0x810 net/socket.c:? ___sys_recvmsg+0x217/0x840 net/socket.c:2743 __sys_recvmsg net/socket.c:2773 __do_sys_recvmsg net/socket.c:2783 __se_sys_recvmsg net/socket.c:2780 __x64_sys_recvmsg+0x364/0x540 net/socket.c:2780 do_syscall_x64 arch/x86/entry/common.c:50 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd arch/x86/entry/entry_64.S:120 ... Uninit was stored to memory at: tipc_sub_subscribe+0x42d/0xb50 net/tipc/subscr.c:156 tipc_conn_rcv_sub+0x246/0x620 net/tipc/topsrv.c:375 tipc_topsrv_kern_subscr+0x2e8/0x400 net/tipc/topsrv.c:579 tipc_group_create+0x4e7/0x7d0 net/tipc/group.c:190 tipc_sk_join+0x2a8/0x770 net/tipc/socket.c:3084 tipc_setsockopt+0xae5/0xe40 net/tipc/socket.c:3201 __sys_setsockopt+0x87f/0xdc0 net/socket.c:2252 __do_sys_setsockopt net/socket.c:2263 __se_sys_setsockopt net/socket.c:2260 __x64_sys_setsockopt+0xe0/0x160 net/socket.c:2260 do_syscall_x64 arch/x86/entry/common.c:50 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd arch/x86/entry/entry_64.S:120 Local variable sub created at: tipc_topsrv_kern_subscr+0x57/0x400 net/tipc/topsrv.c:562 tipc_group_create+0x4e7/0x7d0 net/tipc/group.c:190 Bytes 84-87 of 88 are uninitialized Memory access of size 88 starts at ffff88801ed57cd0 Data copied to user address 0000000020000400 ... =====================================================

Timeline

Scores

EPSS (exploitation in 30 days)

0.16% · top 95% of all CVEs (13 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

• Linux · Linux

  • affected 026321c6d056a54b4145522492245d2b5913ee1d – < 3d1b83ff7b6575a4e41283203e6b2e25ea700cd7
  • affected 026321c6d056a54b4145522492245d2b5913ee1d – < 567f8de358b61015dcfb8878a1f06c5369a45f54
  • affected 026321c6d056a54b4145522492245d2b5913ee1d – < e558e148938442dd49628cd7ef61c360832bef31
  • affected 026321c6d056a54b4145522492245d2b5913ee1d – < dbc01c0a4e202a7e925dad1d4b7c1d6eb0c81154
  • affected 026321c6d056a54b4145522492245d2b5913ee1d – < fef70f978bc289642501d88d2a3f5e841bd31a67
  • affected 026321c6d056a54b4145522492245d2b5913ee1d – < 777ecaabd614d47c482a5c9031579e66da13989a

• Linux · Linux

  • affected 4.17
  • unaffected < 4.17
  • unaffected 4.19.264 – ≤ 4.19.*
  • unaffected 5.4.221 – ≤ 5.4.*
  • unaffected 5.10.152 – ≤ 5.10.*
  • unaffected 5.15.76 – ≤ 5.15.*
  • unaffected 6.0.6 – ≤ 6.0.*
  • unaffected 6.1 – ≤ *

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2025-32023 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2022-50531](https://cveledger.app/badge/CVE-2022-50531.svg)](https://cveledger.app/cve/CVE-2022-50531)

Record last updated 11 May 2026, 19:21 UTC.