Vulnerability-Lookup

GHSA-2PWC-RV94-9PP5

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-20 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

netfilter: ebtables: move to two-stage removal scheme

Like previous patches for x_tables, follow same pattern in ebtables. We can't reuse xt helpers: ebt_table struct layout is incompatible.

table->ops assignment is now done while still holding the ebt mutex to make sure we never expose partially-filled table struct.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64077"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:48Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ebtables: move to two-stage removal scheme\n\nLike previous patches for x_tables, follow same pattern in ebtables.\nWe can\u0027t reuse xt helpers: ebt_table struct layout is incompatible.\n\ntable-\u003eops assignment is now done while still holding the ebt mutex\nto make sure we never expose partially-filled table struct.",
  "id": "GHSA-2pwc-rv94-9pp5",
  "modified": "2026-07-20T15:31:58Z",
  "published": "2026-07-19T18:31:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64077"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/739d5dac7b2da44a756aa4d758ee3f1ccf5a27f1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b7f0544d86d439cb946515d2ef6a0a75e8626710"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ef395579a7631a06d61969fc712eb80402231b89"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-64077 (GCVE-0-2026-64077)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-08-05 12:38

Title

netfilter: ebtables: move to two-stage removal scheme

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: ebtables: move to two-stage removal scheme Like previous patches for x_tables, follow same pattern in ebtables. We can't reuse xt helpers: ebt_table struct layout is incompatible. table->ops assignment is now done while still holding the ebt mutex to make sure we never expose partially-filled table struct.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/739d5dac7b2da44a7…
https://git.kernel.org/stable/c/ef395579a7631a06d…
https://git.kernel.org/stable/c/b7f0544d86d439cb9…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 87663c39f898b18905499126548da61450628682 , < 739d5dac7b2da44a756aa4d758ee3f1ccf5a27f1 (git) Affected: 87663c39f898b18905499126548da61450628682 , < ef395579a7631a06d61969fc712eb80402231b89 (git) Affected: 87663c39f898b18905499126548da61450628682 , < b7f0544d86d439cb946515d2ef6a0a75e8626710 (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bridge/netfilter/ebtable_broute.c",
            "net/bridge/netfilter/ebtable_filter.c",
            "net/bridge/netfilter/ebtable_nat.c",
            "net/bridge/netfilter/ebtables.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "739d5dac7b2da44a756aa4d758ee3f1ccf5a27f1",
              "status": "affected",
              "version": "87663c39f898b18905499126548da61450628682",
              "versionType": "git"
            },
            {
              "lessThan": "ef395579a7631a06d61969fc712eb80402231b89",
              "status": "affected",
              "version": "87663c39f898b18905499126548da61450628682",
              "versionType": "git"
            },
            {
              "lessThan": "b7f0544d86d439cb946515d2ef6a0a75e8626710",
              "status": "affected",
              "version": "87663c39f898b18905499126548da61450628682",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bridge/netfilter/ebtable_broute.c",
            "net/bridge/netfilter/ebtable_filter.c",
            "net/bridge/netfilter/ebtable_nat.c",
            "net/bridge/netfilter/ebtables.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ebtables: move to two-stage removal scheme\n\nLike previous patches for x_tables, follow same pattern in ebtables.\nWe can\u0027t reuse xt helpers: ebt_table struct layout is incompatible.\n\ntable-\u003eops assignment is now done while still holding the ebt mutex\nto make sure we never expose partially-filled table struct."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached through ebtables setsockopt/getsockopt administration syscalls (do_ebt_set_ctl/do_ebt_get_ctl), not through processing of remotely received network or bridge frames.\nAC:L - An attacker can reliably win the race by running concurrent threads\u2014one issuing ebtables setsockopt to register or modify a table while another destroys the network namespace or triggers module teardown.\nPR:L - All entry paths require CAP_NET_ADMIN in the target network namespace, which an unprivileged local attacker can obtain via user+network namespaces (unshare -Urn).\nUI:N - Exploitation requires no action from any other user or administrator beyond the attacker\u2019s own local namespace and sockopt operations.\nS:U - Impact is confined to kernel memory and privileges on the host; this is a standard kernel race/UAF issue, not a VM, container, or IOMMU boundary escape.\nC:H - The missing two-stage removal allows concurrent setsockopt to use an ebt_table while __ebt_unregister_table() frees its backing structures, creating a use-after-free that can be leveraged for arbitrary kernel memory disclosure.\nI:H - The teardown race and partially-initialized table exposure enable heap use-after-free conditions that can be developed into arbitrary kernel memory writes or code execution via heap grooming.\nA:H - The NULL ops race causes a general protection fault in nf_unregister_net_hooks(), and the concurrent teardown UAF can trigger kernel oops, panic, or denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:38:57.583Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/739d5dac7b2da44a756aa4d758ee3f1ccf5a27f1"
        },
        {
          "url": "https://git.kernel.org/stable/c/ef395579a7631a06d61969fc712eb80402231b89"
        },
        {
          "url": "https://git.kernel.org/stable/c/b7f0544d86d439cb946515d2ef6a0a75e8626710"
        }
      ],
      "title": "netfilter: ebtables: move to two-stage removal scheme",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64077",
    "datePublished": "2026-07-19T15:39:50.966Z",
    "dateReserved": "2026-07-19T07:54:57.031Z",
    "dateUpdated": "2026-08-05T12:38:57.583Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.
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GHSA-2PWC-RV94-9PP5

CVE-2026-64077 (GCVE-0-2026-64077)

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