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GHSA-6MGV-G2FH-H577

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72416"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:15Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_compat: ebtables emulation must reject non-bridge targets\n\nxtables targets return netfilter verdicts: NF_ACCEPT, NF_DROP, and so\non.  ebtables targets return incompatible verdicts: EBT_ACCEPT,\nEBT_DROP, ...   We cannot allow fallback to NFPROTO_UNSPEC.\n\nebtables doesn\u0027t permit this since\n11ff7288beb2 (\"netfilter: ebtables: reject non-bridge targets\")\nbut that commit missed the nft_compat layer.",
  "id": "GHSA-6mgv-g2fh-h577",
  "modified": "2026-08-17T06:33:28Z",
  "published": "2026-08-15T06:32:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72416"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/33e1875d6b5b552a2e5652b40074c604199354ee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9dbba7e694ec045f21ede2f892fb42b81b4e1692"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b3f7a84540a0d014ec42343ff5909657c1bd1994"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c129b0185e707dce405968e21afccd5728b2ce63"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/efc17b9240d821c424bc5191a5c6e9384a06293e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:43

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

Linux mitre root Scorecard

References

5 references

URL	Tags
https://git.kernel.org/stable/c/efc17b9240d821c42…
https://git.kernel.org/stable/c/b3f7a84540a0d014e…
https://git.kernel.org/stable/c/33e1875d6b5b552a2…
https://git.kernel.org/stable/c/c129b0185e707dce4…
https://git.kernel.org/stable/c/9dbba7e694ec045f2…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0ca743a5599199152a31a7146b83213c786c2eb2 , < efc17b9240d821c424bc5191a5c6e9384a06293e (git) Affected: 0ca743a5599199152a31a7146b83213c786c2eb2 , < b3f7a84540a0d014ec42343ff5909657c1bd1994 (git) Affected: 0ca743a5599199152a31a7146b83213c786c2eb2 , < 33e1875d6b5b552a2e5652b40074c604199354ee (git) Affected: 0ca743a5599199152a31a7146b83213c786c2eb2 , < c129b0185e707dce405968e21afccd5728b2ce63 (git) Affected: 0ca743a5599199152a31a7146b83213c786c2eb2 , < 9dbba7e694ec045f21ede2f892fb42b81b4e1692 (git)
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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nft_compat.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "efc17b9240d821c424bc5191a5c6e9384a06293e",
              "status": "affected",
              "version": "0ca743a5599199152a31a7146b83213c786c2eb2",
              "versionType": "git"
            },
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              "version": "0ca743a5599199152a31a7146b83213c786c2eb2",
              "versionType": "git"
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              "lessThan": "33e1875d6b5b552a2e5652b40074c604199354ee",
              "status": "affected",
              "version": "0ca743a5599199152a31a7146b83213c786c2eb2",
              "versionType": "git"
            },
            {
              "lessThan": "c129b0185e707dce405968e21afccd5728b2ce63",
              "status": "affected",
              "version": "0ca743a5599199152a31a7146b83213c786c2eb2",
              "versionType": "git"
            },
            {
              "lessThan": "9dbba7e694ec045f21ede2f892fb42b81b4e1692",
              "status": "affected",
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              "versionType": "git"
            }
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.13"
            },
            {
              "lessThan": "3.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
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              ],
              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_compat: ebtables emulation must reject non-bridge targets\n\nxtables targets return netfilter verdicts: NF_ACCEPT, NF_DROP, and so\non.  ebtables targets return incompatible verdicts: EBT_ACCEPT,\nEBT_DROP, ...   We cannot allow fallback to NFPROTO_UNSPEC.\n\nebtables doesn\u0027t permit this since\n11ff7288beb2 (\"netfilter: ebtables: reject non-bridge targets\")\nbut that commit missed the nft_compat layer."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:43:56.159Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/efc17b9240d821c424bc5191a5c6e9384a06293e"
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          "url": "https://git.kernel.org/stable/c/33e1875d6b5b552a2e5652b40074c604199354ee"
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        },
        {
          "url": "https://git.kernel.org/stable/c/9dbba7e694ec045f21ede2f892fb42b81b4e1692"
        }
      ],
      "title": "netfilter: nft_compat: ebtables emulation must reject non-bridge targets",
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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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}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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GHSA-6MGV-G2FH-H577

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

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