{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80664",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-80664"
  ],
  "published": "2026-08-28T06:50:33Z",
  "summary": "netfilter: xt_nat: reject unsupported target families",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_nat: reject unsupported target families\n\nxt_nat SNAT and DNAT target handlers assume IP-family conntrack state\nis present and can dereference a NULL pointer when instantiated from an\nunsupported family through nft_compat. A bridge-family compat rule can\ntherefore trigger a NULL-dereference in nf_nat_setup_info().\n\nReject non-IP families in xt_nat_checkentry() so unsupported targets\ncannot be installed. Keep NFPROTO_INET allowed for valid inet NAT\ncompat users and leave the runtime fast path unchanged.\n\n[ The crash was fixed via\n  9dbba7e694ec (\"netfilter: nft_compat: ebtables emulation must reject non-bridge targets\"),\n  so this patch is no longer critical.\n  Nevertheless, NAT is only relevant for ipv4/ipv6, so this extra\n  family check is a good idea in any case. ]",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H"
    }
  ],
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80664"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/49abe564391411057a26a9a943c8e17867c3b9b4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a842dab87cab29f2a5798a47b2dc5e6a449950bf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e35c048d7511e9d4c2a537b8a231c49606e97c16"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/679ced28a9dc2f6dc679eb05027d779693e60902"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ec88fa71c82072e9189983b05b499d3507550271"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5d1a2240935ea47e2673d0ea17fdb058e4dc91dd"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-29T06:25:05Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.3,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires installing a bridge-family nft_compat SNAT/DNAT rule via NETLINK_NETFILTER (nftables netlink), a local syscall path; although matching bridge traffic can trigger evaluation, the vulnerable rule state cannot be created without local netfilter administration.\nAC:L - Once CAP_NET_ADMIN is held in the target network namespace, xt_request_find_target() deterministically resolves UNSPEC-family SNAT/DNAT rev 1/2 targets for bridge chains, and sending bridge traffic through the committed rule reliably reaches nf_nat_setup_info() with a NULL nf_conn from nf_ct_get().\nPR:L - All nfnetlink handlers are gated by netlink_net_capable(skb, CAP_NET_ADMIN), which checks capability in the socket network namespace user namespace; unprivileged local users routinely obtain CAP_NET_ADMIN via user and network namespaces (unshare -Urn), enabling installation of the malicious bridge compat rule.\nUI:N - No victim interaction is required beyond the attacker obtaining namespace-local CAP_NET_ADMIN, creating a bridge nftables chain with a compat SNAT/DNAT target, and delivering matching bridge traffic; no third-party actions such as mounting filesystems or opening files are needed.\nS:U - Impact is confined to the host kernel netfilter/NAT subsystem within the same security authority; this is not a VM escape, hypervisor boundary crossing, or IOMMU/DMA sandbox bypass, but standard in-kernel misbehavior from an invalid family/target pairing.\nC:L - The primary runtime failure is a NULL nf_conn dereference in nf_nat_setup_info(), and the surrounding nft_compat bridge/xtables semantic mismatch can leak limited kernel information via oops register dumps and crash logs readable by the local attacker who triggered the fault.\nI:H - Missing family validation lets IP-family NAT targets execute under bridge nft_compat semantics where nf_ct_get() yields NULL, constituting a type/family confusion that can corrupt netfilter verdict and NAT handling before faulting; mis-instantiated SNAT/DNAT targets should not run in bridge context at all.\nA:H - Passing bridge traffic through a bridge-family compat SNAT/DNAT rule causes nf_nat_setup_info() to dereference the NULL connection from nf_ct_get(), producing a kernel oops or panic; repeated matching traffic can retrigger the crash for sustained denial of service."
    }
  }
}