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CVE-2026-72416 (GCVE-0-2026-72416)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:43
VLAI
Title
netfilter: nft_compat: ebtables emulation must reject non-bridge targets
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_compat: ebtables emulation must reject non-bridge targets xtables targets return netfilter verdicts: NF_ACCEPT, NF_DROP, and so on. ebtables targets return incompatible verdicts: EBT_ACCEPT, EBT_DROP, ... We cannot allow fallback to NFPROTO_UNSPEC. ebtables doesn't permit this since 11ff7288beb2 ("netfilter: ebtables: reject non-bridge targets") but that commit missed the nft_compat layer.
Severity
7.3 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0ca743a5599199152a31a7146b83213c786c2eb2 , < efc17b9240d821c424bc5191a5c6e9384a06293e (git)
Affected: 0ca743a5599199152a31a7146b83213c786c2eb2 , < b3f7a84540a0d014ec42343ff5909657c1bd1994 (git)
Affected: 0ca743a5599199152a31a7146b83213c786c2eb2 , < 33e1875d6b5b552a2e5652b40074c604199354ee (git)
Affected: 0ca743a5599199152a31a7146b83213c786c2eb2 , < c129b0185e707dce405968e21afccd5728b2ce63 (git)
Affected: 0ca743a5599199152a31a7146b83213c786c2eb2 , < 9dbba7e694ec045f21ede2f892fb42b81b4e1692 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.13
Unaffected: 0 , < 3.13 (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "net/netfilter/nft_compat.c"
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              "value": "AV:L - The bug is reached by installing a bridge-family nft_compat rule through NETLINK_NETFILTER (nftables netlink), which is a local syscall path; packet evaluation on bridge hooks can be driven by traffic, but creating the vulnerable rule state requires local netfilter administration.\nAC:L - Exploitation is deterministic once CAP_NET_ADMIN is held in the target network namespace: xt_request_find_target() falls back to NFPROTO_UNSPEC targets, nft_target_eval_bridge() misinterprets xtables verdicts, and sending matching bridge traffic reliably triggers the faulty evaluation (e.g. NULL ct in nf_nat_setup_info()).\nPR:L - All nfnetlink entry points are gated by netlink_net_capable(..., CAP_NET_ADMIN), which checks the socket network namespace user namespace; unprivileged local users routinely obtain this capability via user+network namespaces (unshare -Urn), matching the reporters\u0027 nft_compat reproduction model.\nUI:N - No victim interaction is required beyond the attacker obtaining namespace-local CAP_NET_ADMIN and installing the malicious bridge nft_compat rule; subsequent packet delivery to the bridge hook is automatic once the rule is committed.\nS:U - Impact is confined to the host kernel and its network filtering state; this is not a VM escape, hypervisor boundary crossing, or IOMMU/DMA sandbox bypass, but standard in-kernel netfilter misbehavior within the same security authority.\nC:L - The primary primitive is verdict-namespace type confusion between xtables (NF_*) and ebtables (EBT_*) return conventions; while no arbitrary read is demonstrated, a triggered kernel oops from NULL ct dereference in nf_nat_setup_info() can expose kernel pointers in crash logs accessible to the local attacker.\nI:H - Incompatible verdict translation lets xtables targets run under ebtables semantics: XT_CONTINUE (0xFFFFFFFF/-1) is mapped to EBT_ACCEPT/NF_ACCEPT instead of continuing rule evaluation, and mis-instantiated targets such as SNAT/DNAT can alter connection-tracking/NAT state before faulting, constituting type-confusion integrity impact.\nA:H - Installing an IP-family UNSPEC target (e.g. SNAT/DNAT rev 1/2) in a bridge nft_compat chain and passing traffic causes nf_nat_setup_info() to dereference a NULL nf_conn from nf_ct_get(), producing a kernel oops/panic; repeated bridge traffic can retrigger the crash for sustained denial of service."
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        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72416",
    "datePublished": "2026-08-15T05:56:36.886Z",
    "dateReserved": "2026-08-09T03:40:39.927Z",
    "dateUpdated": "2026-08-17T05:43:56.159Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T17:40:38+00:00",
      "cve": "CVE-2026-72416",
      "id": "CVE-2026-72416",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: nft_compat: ebtables emulation must reject non-bridge targets",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72416.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.