{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "9291747f118d6404e509747b85ff5f6dfec368d2"
            },
            {
              "fixed": "80e3c75f71c3ea1e62fcb032382de13e00a68f8b"
            },
            {
              "fixed": "d9a0af9e43416aa50c0595e15fa01365a1c72c49"
            },
            {
              "fixed": "1cd6313c8644bfebbd813a05da9daa21b09dd68c"
            },
            {
              "fixed": "f00ac65c90ea475719e08d629e2e26c8b4e6999b"
            },
            {
              "fixed": "e7e1b6bcb389c8708003d40613a59ff2496f6b1f"
            },
            {
              "fixed": "dc3e27dd7d76e21106b8f9bbdc31f5da74a89014"
            },
            {
              "fixed": "3e79374b03bf9a2f282f0eb1d0ac3776f7e0f28a"
            },
            {
              "fixed": "3d5d488f11776738deab9da336038add95d342d1"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.39"
            },
            {
              "fixed": "5.10.253"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.203"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.168"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.134"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.81"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.22"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31424.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP\n\nWeiming Shi says:\n\nxt_match and xt_target structs registered with NFPROTO_UNSPEC can be\nloaded by any protocol family through nft_compat. When such a\nmatch/target sets .hooks to restrict which hooks it may run on, the\nbitmask uses NF_INET_* constants. This is only correct for families\nwhose hook layout matches NF_INET_*: IPv4, IPv6, INET, and bridge\nall share the same five hooks (PRE_ROUTING ... POST_ROUTING).\n\nARP only has three hooks (IN=0, OUT=1, FORWARD=2) with different\nsemantics. Because NF_ARP_OUT == 1 == NF_INET_LOCAL_IN, the .hooks\nvalidation silently passes for the wrong reasons, allowing matches to\nrun on ARP chains where the hook assumptions (e.g. state-\u003ein being\nset on input hooks) do not hold. This leads to NULL pointer\ndereferences; xt_devgroup is one concrete example:\n\n Oops: general protection fault, probably for non-canonical address 0xdffffc0000000044: 0000 [#1] SMP KASAN NOPTI\n KASAN: null-ptr-deref in range [0x0000000000000220-0x0000000000000227]\n RIP: 0010:devgroup_mt+0xff/0x350\n Call Trace:\n  \u003cTASK\u003e\n  nft_match_eval (net/netfilter/nft_compat.c:407)\n  nft_do_chain (net/netfilter/nf_tables_core.c:285)\n  nft_do_chain_arp (net/netfilter/nft_chain_filter.c:61)\n  nf_hook_slow (net/netfilter/core.c:623)\n  arp_xmit (net/ipv4/arp.c:666)\n  \u003c/TASK\u003e\n Kernel panic - not syncing: Fatal exception in interrupt\n\nFix it by restricting arptables to NFPROTO_ARP extensions only.\nNote that arptables-legacy only supports:\n\n- arpt_CLASSIFY\n- arpt_mangle\n- arpt_MARK\n\nthat provide explicit NFPROTO_ARP match/target declarations.",
  "id": "CVE-2026-31424",
  "modified": "2026-07-08T05:39:27.735357076Z",
  "published": "2026-04-13T13:40:27.957Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1cd6313c8644bfebbd813a05da9daa21b09dd68c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d5d488f11776738deab9da336038add95d342d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3e79374b03bf9a2f282f0eb1d0ac3776f7e0f28a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/80e3c75f71c3ea1e62fcb032382de13e00a68f8b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d9a0af9e43416aa50c0595e15fa01365a1c72c49"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dc3e27dd7d76e21106b8f9bbdc31f5da74a89014"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e7e1b6bcb389c8708003d40613a59ff2496f6b1f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f00ac65c90ea475719e08d629e2e26c8b4e6999b"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31424.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31424"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP"
}