nbd: call genl_unregister_family() first in nbd_cleanup()

{
  "id": "2d2aedaa9cc6395b4b1f61dad6875ee4f70a042d89be45f9b8215f8c0c1f1319",
  "url": "https://osv.dev/vulnerability/CVE-2022-49295",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "nbd: call genl_unregister_family() first in nbd_cleanup()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: nbd: call genl_unregister_family() first in nbd_cleanup() Otherwise there may be race between module removal and the handling of netlink command, which can lead to the oops as shown below: BUG: kernel NULL pointer dereference, address: 0000000000000098 Oops: 0002 [#1] SMP PTI CPU: 1 PID: 31299 Comm: nbd-client Tainted: G E 5.14.0-rc4 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:down_write+0x1a/0x50 Call Trace: start_creating+0x89/0x130 debugfs_create_dir+0x1b/0x130 nbd_start_device+0x13d/0x390 [nbd] nbd_genl_connect+0x42f/0x748 [nbd] genl_family_rcv_msg_doit.isra.0+0xec/0x150 genl_rcv_msg+0xe5/0x1e0 netlink_rcv_skb+0x55/0x100 genl_rcv+0x29/0x40 netlink_unicast+0x1a8/0x250 netlink_sendmsg+0x21b/0x430 ____sys_sendmsg+0x2a4/0x2d0 ___sys_sendmsg+0x81/0xc0 __sys_sendmsg+0x62/0xb0 __x64_sys_sendmsg+0x1f/0x30 do_syscall_64+0x3b/0xc0 entry_SYSCALL_64_after_hwframe+0x44/0xae Modules linked in: nbd(E-)",
    "evidence": "osv:CVE-2022-49295",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.14.283",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "4.19.247",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.4.198",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.122",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.47",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.17.15",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.18.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2022-49295",
      "aliases": [
        "CVE-2022-49295"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e46c7287b1c27683a8e30ca825fb98e2b97f1099"
                },
                {
                  "fixed": "8a1435c862ea09b06be7acda325128dc08458e25"
                },
                {
                  "fixed": "013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5c"
                },
                {
                  "fixed": "1be608e1ee1f222464b2856bda9b85ab5184a33e"
                },
                {
                  "fixed": "c0868f6e728c3c28bef0e8bee89d2daf86a8bbca"
                },
                {
                  "fixed": "cbeafa7a79d08ecdb55f8f1d41a11323d0f709db"
                },
                {
                  "fixed": "6f505bbb8063fd3a238a4239d2d8c165e5279f6f"
                },
                {
                  "fixed": "3d5da1ffba3388c2ae2e6c598855a4d887d3bf79"
                },
                {
                  "fixed": "06c4da89c24e7023ea448cadf8e9daf06a0aae6e"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49295.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.12.0"
                },
                {
                  "fixed": "4.14.283"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.15.0"
                },
                {
                  "fixed": "4.19.247"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.20.0"
                },
                {
                  "fixed": "5.4.198"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.122"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.47"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "5.17.15"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.18.0"
                },
                {
                  "fixed": "5.18.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49295.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.613603383Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5c",
        "https://git.kernel.org/stable/c/06c4da89c24e7023ea448cadf8e9daf06a0aae6e",
        "https://git.kernel.org/stable/c/1be608e1ee1f222464b2856bda9b85ab5184a33e",
        "https://git.kernel.org/stable/c/3d5da1ffba3388c2ae2e6c598855a4d887d3bf79",
        "https://git.kernel.org/stable/c/6f505bbb8063fd3a238a4239d2d8c165e5279f6f",
        "https://git.kernel.org/stable/c/8a1435c862ea09b06be7acda325128dc08458e25",
        "https://git.kernel.org/stable/c/c0868f6e728c3c28bef0e8bee89d2daf86a8bbca",
        "https://git.kernel.org/stable/c/cbeafa7a79d08ecdb55f8f1d41a11323d0f709db",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49295.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49295",
        "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/2022/49xxx/CVE-2022-49295.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49295",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488914,
  "published_at": "2025-02-26T02:01:25.659+00:00"
}