netfilter: xtables: avoid NFPROTO_UNSPEC where needed

{
  "id": "32d41db5558ec2214dfcac153255bf37dc94741690c1f50c37a64afe1d617229",
  "url": "https://osv.dev/vulnerability/CVE-2024-50038",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "netfilter: xtables: avoid NFPROTO_UNSPEC where needed",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: netfilter: xtables: avoid NFPROTO_UNSPEC where needed syzbot managed to call xt_cluster match via ebtables: WARNING: CPU: 0 PID: 11 at net/netfilter/xt_cluster.c:72 xt_cluster_mt+0x196/0x780 [..] ebt_do_table+0x174b/0x2a40 Module registers to NFPROTO_UNSPEC, but it assumes ipv4/ipv6 packet processing. As this is only useful to restrict locally terminating TCP/UDP traffic, register this for ipv4 and ipv6 family only. Pablo points out that this is a general issue, direct users of the set/getsockopt interface can call into targets/matches that were only intended for use with ip(6)tables. Check all UNSPEC matches and targets for similar issues: - matches and targets are fine except if they assume skb_network_header() is valid -- this is only true when called from inet layer: ip(6) stack pulls the ip/ipv6 header into linear data area. - targets that return XT_CONTINUE or other xtables verdicts must be restricted too, they are incompatbile with the ebtables traverser, e.g. EBT_CONTINUE is a completely different value than XT_CONTINUE. Most matches/targets are changed to register for NFPROTO_IPV4/IPV6, as they are provided for use by ip(6)tables. The MARK target is also used by arptables, so register for NFPROTO_ARP too. While at it, bail out if connbytes fails to enable the corresponding conntrack family. This change passes the selftests in iptables.git.",
    "evidence": "osv:CVE-2024-50038",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.168",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.113",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.57",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.11.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-50038",
      "aliases": [
        "CVE-2024-50038"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0269ea4937343536ec7e85649932bc8c9686ea78"
                },
                {
                  "fixed": "85ff9a0f793ca52c527e75cd40a69c948627ebde"
                },
                {
                  "fixed": "8f482bb7e27b37f1f734bb9a8eeb28b23d59d189"
                },
                {
                  "fixed": "997f67d813ce0cf5eb3cdb8f124da68141e91b6c"
                },
                {
                  "fixed": "4cdc55ec6222bb195995cc58f7cb46e4d8907056"
                },
                {
                  "fixed": "0bfcb7b71e735560077a42847f69597ec7dcc326"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-50038.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "2.6.30"
                },
                {
                  "fixed": "5.15.168"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.113"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.57"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.11.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-50038.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:43.932609628Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0bfcb7b71e735560077a42847f69597ec7dcc326",
        "https://git.kernel.org/stable/c/4cdc55ec6222bb195995cc58f7cb46e4d8907056",
        "https://git.kernel.org/stable/c/85ff9a0f793ca52c527e75cd40a69c948627ebde",
        "https://git.kernel.org/stable/c/8f482bb7e27b37f1f734bb9a8eeb28b23d59d189",
        "https://git.kernel.org/stable/c/997f67d813ce0cf5eb3cdb8f124da68141e91b6c",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50038.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-50038",
        "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/2024/50xxx/CVE-2024-50038.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-50038",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 511660,
  "published_at": "2024-10-21T19:39:38.451+00:00"
}