tipc: fix an information leak in tipc_topsrv_kern_subscr

{
  "id": "b9080bdb624a6a793d6effa90cf76f28812a67adb92bce6bf47e6a869954fcc8",
  "url": "https://osv.dev/vulnerability/CVE-2022-50531",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tipc: fix an information leak in tipc_topsrv_kern_subscr",
    "summary": "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_tops",
    "evidence": "osv:CVE-2022-50531",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.19.264",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.4.221",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.152",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.76",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.0.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-50531",
      "aliases": [
        "CVE-2022-50531"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "026321c6d056a54b4145522492245d2b5913ee1d"
                },
                {
                  "fixed": "3d1b83ff7b6575a4e41283203e6b2e25ea700cd7"
                },
                {
                  "fixed": "567f8de358b61015dcfb8878a1f06c5369a45f54"
                },
                {
                  "fixed": "e558e148938442dd49628cd7ef61c360832bef31"
                },
                {
                  "fixed": "dbc01c0a4e202a7e925dad1d4b7c1d6eb0c81154"
                },
                {
                  "fixed": "fef70f978bc289642501d88d2a3f5e841bd31a67"
                },
                {
                  "fixed": "777ecaabd614d47c482a5c9031579e66da13989a"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50531.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.17.0"
                },
                {
                  "fixed": "4.19.264"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.20.0"
                },
                {
                  "fixed": "5.4.221"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.152"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.76"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.0.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50531.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:53.525672512Z",
      "provider": "osv",
      "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",
        "https://git.kernel.org/stable/c/fef70f978bc289642501d88d2a3f5e841bd31a67",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50531.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-50531",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50531.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-50531",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 522005,
  "published_at": "2025-10-07T15:19:21.911+00:00"
}