net: ipv4: fix route with nexthop object delete warning

{
  "id": "099b06c48f3c3ea5f6151f25ab119f954fae381e834bd487f06102bcbe97d702",
  "url": "https://osv.dev/vulnerability/CVE-2022-49092",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: ipv4: fix route with nexthop object delete warning",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: ipv4: fix route with nexthop object delete warning FRR folks have hit a kernel warning[1] while deleting routes[2] which is caused by trying to delete a route pointing to a nexthop id without specifying nhid but matching on an interface. That is, a route is found but we hit a warning while matching it. The warning is from fib_info_nh() in include/net/nexthop.h because we run it on a fib_info with nexthop object. The call chain is: inet_rtm_delroute -> fib_table_delete -> fib_nh_match (called with a nexthop fib_info and also with fc_oif set thus calling fib_info_nh on the fib_info and triggering the warning). The fix is to not do any matching in that branch if the fi has a nexthop object because those are managed separately. I.e. we should match when deleting without nh spec and should fail when deleting a nexthop route with old-style nh spec because nexthop objects are managed separately, e.g.: $ ip r show 1.2.3.4/32 1.2.3.4 nhid 12 via 192.168.11.2 dev dummy0 $ ip r del 1.2.3.4/32 $ ip r del 1.2.3.4/32 nhid 12 $ ip r del 1.2.3.4/32 dev dummy0 [1] [ 523.462226] ------------[ cut here ]------------ [ 523.462230] WARNING: CPU: 14 PID: 22893 at include/net/nexthop.h:468 fib_nh_match+0x210/0x460 [ 523.462236] Modules linked in: dummy rpcsec_gss_krb5 xt_socket nf_socket_ipv4 nf_socket_ipv6 ip6table_raw iptable_raw bpf_preload xt_statistic ip_set ip_vs_sh ip_vs_wrr ip_vs_rr ip_vs xt_mark nf_tables xt_nat veth ",
    "evidence": "osv:CVE-2022-49092",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.4.189",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.111",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.34",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.16.20",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.17.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2022-49092",
      "aliases": [
        "CVE-2022-49092"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "4c7e8084fd467ddb2b0e6c6011f9c1064afb7e56"
                },
                {
                  "fixed": "f5064531c23ad646da7be8b938292b00a7e61438"
                },
                {
                  "fixed": "63ea57478aaa3e06a597081a0f537318fc04e49f"
                },
                {
                  "fixed": "907c97986d6fa77318d17659dd76c94b65dd27c5"
                },
                {
                  "fixed": "dcd689f9e2640c992f94eae9955b106f71c6825d"
                },
                {
                  "fixed": "f8db5743d09523c0bb35f16e13691e3b7eb5dba0"
                },
                {
                  "fixed": "6bf92d70e690b7ff12b24f4bfff5e5434d019b82"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49092.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.3.0"
                },
                {
                  "fixed": "5.4.189"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.111"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.34"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "5.16.20"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.17.0"
                },
                {
                  "fixed": "5.17.3"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49092.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.979745117Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/63ea57478aaa3e06a597081a0f537318fc04e49f",
        "https://git.kernel.org/stable/c/6bf92d70e690b7ff12b24f4bfff5e5434d019b82",
        "https://git.kernel.org/stable/c/907c97986d6fa77318d17659dd76c94b65dd27c5",
        "https://git.kernel.org/stable/c/dcd689f9e2640c992f94eae9955b106f71c6825d",
        "https://git.kernel.org/stable/c/f5064531c23ad646da7be8b938292b00a7e61438",
        "https://git.kernel.org/stable/c/f8db5743d09523c0bb35f16e13691e3b7eb5dba0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49092.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49092",
        "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-2022-49092.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49092",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496498,
  "published_at": "2025-02-26T01:54:47.172+00:00"
}