Vulnerability-Lookup

GHSA-MF9R-R7X5-32QQ

Vulnerability from github – Published: 2026-09-03 15:32 – Updated: 2026-09-03 15:32

Details

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

net: remove WARN_ON_ONCE() from sk_mc_loop()

sk_mc_loop() can be called for sockets that are neither AF_INET nor AF_INET6 (e.g. AF_PACKET sockets when sending packets via raw/packet socket over virtual devices such as VRF or ipvlan).

In such cases, sk_family is not AF_INET/AF_INET6 and sk_mc_loop() falls through the switch statement and triggers WARN_ON_ONCE(1).

Non-INET sockets do not support IP_MULTICAST_LOOP or IPV6_MULTICAST_LOOP options, so loopback should default to true without generating a warning.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80733"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-03T13:06:12Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: remove WARN_ON_ONCE() from sk_mc_loop()\n\nsk_mc_loop() can be called for sockets that are neither AF_INET\nnor AF_INET6 (e.g. AF_PACKET sockets when sending packets via raw/packet\nsocket over virtual devices such as VRF or ipvlan).\n\nIn such cases, sk_family is not AF_INET/AF_INET6 and sk_mc_loop() falls\nthrough the switch statement and triggers WARN_ON_ONCE(1).\n\nNon-INET sockets do not support IP_MULTICAST_LOOP or IPV6_MULTICAST_LOOP\noptions, so loopback should default to true without generating a warning.",
  "id": "GHSA-mf9r-r7x5-32qq",
  "modified": "2026-09-03T15:32:14Z",
  "published": "2026-09-03T15:32:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80733"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/97133c4d42654578fab95abe47359ebe784dde18"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad7fa2f411cb30f63d6725f111be134064cdb718"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b8a39a09ae4eaae04309e1e38ed6a1101d967496"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c8f256dc849205ccb2bd78bd99a3497b972b44e0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2adc4e80b29e58b5162ae09f0f657a215806c8c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f625c742b33dc137c209dd13d1c5f12b1c18d71c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-80733 (GCVE-0-2026-80733)

Vulnerability from cvelistv5 – Published: 2026-09-03 08:21 – Updated: 2026-09-03 08:21

Title

net: remove WARN_ON_ONCE() from sk_mc_loop()

Summary

In the Linux kernel, the following vulnerability has been resolved: net: remove WARN_ON_ONCE() from sk_mc_loop() sk_mc_loop() can be called for sockets that are neither AF_INET nor AF_INET6 (e.g. AF_PACKET sockets when sending packets via raw/packet socket over virtual devices such as VRF or ipvlan). In such cases, sk_family is not AF_INET/AF_INET6 and sk_mc_loop() falls through the switch statement and triggers WARN_ON_ONCE(1). Non-INET sockets do not support IP_MULTICAST_LOOP or IPV6_MULTICAST_LOOP options, so loopback should default to true without generating a warning.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/97133c4d42654578f…
https://git.kernel.org/stable/c/f625c742b33dc137c…
https://git.kernel.org/stable/c/ad7fa2f411cb30f63…
https://git.kernel.org/stable/c/d2adc4e80b29e58b5…
https://git.kernel.org/stable/c/ad7dbb1d14b1b4406…
https://git.kernel.org/stable/c/c8f256dc849205ccb…
https://git.kernel.org/stable/c/0d75f2c1d0764efa7…
https://git.kernel.org/stable/c/b8a39a09ae4eaae04…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 , < 97133c4d42654578fab95abe47359ebe784dde18 (git) Affected: f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 , < f625c742b33dc137c209dd13d1c5f12b1c18d71c (git) Affected: f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 , < ad7fa2f411cb30f63d6725f111be134064cdb718 (git) Affected: f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 , < d2adc4e80b29e58b5162ae09f0f657a215806c8c (git) Affected: f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 , < ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe (git) Affected: f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 , < c8f256dc849205ccb2bd78bd99a3497b972b44e0 (git) Affected: f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 , < 0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f (git) Affected: f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 , < b8a39a09ae4eaae04309e1e38ed6a1101d967496 (git) Affected: c91f81773cd4bbebfe744e9ab30a7ce093f9b930 (git) Affected: c8c30b2b17f2133e953850c547e3902c3a3d80e2 (git) Affected: 3fe207e4637a2e792c46a08666aa722f77d7f8f7 (git) Affected: 3.14.40 , < 3.15 (semver) Affected: 3.18.13 , < 3.19 (semver) Affected: 3.19.6 , < 3.20 (semver)
Linux	Linux	Affected: 4.0 Unaffected: 0 , < 4.0 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.152 , ≤ 6.6.* (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "status": "affected",
              "version": "f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90",
              "versionType": "git"
            },
            {
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            },
            {
              "lessThan": "ad7fa2f411cb30f63d6725f111be134064cdb718",
              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
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            {
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              "versionType": "git"
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              "version": "f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90",
              "versionType": "git"
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            {
              "status": "affected",
              "version": "c91f81773cd4bbebfe744e9ab30a7ce093f9b930",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c8c30b2b17f2133e953850c547e3902c3a3d80e2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3fe207e4637a2e792c46a08666aa722f77d7f8f7",
              "versionType": "git"
            },
            {
              "lessThan": "3.15",
              "status": "affected",
              "version": "3.14.40",
              "versionType": "semver"
            },
            {
              "lessThan": "3.19",
              "status": "affected",
              "version": "3.18.13",
              "versionType": "semver"
            },
            {
              "lessThan": "3.20",
              "status": "affected",
              "version": "3.19.6",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.0"
            },
            {
              "lessThan": "4.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "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": "5.10.265",
                  "versionStartIncluding": "4.0",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "5.15.216",
                  "versionStartIncluding": "4.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "4.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.0",
                  "vulnerable": true
                },
                {
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "4.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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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\nnet: remove WARN_ON_ONCE() from sk_mc_loop()\n\nsk_mc_loop() can be called for sockets that are neither AF_INET\nnor AF_INET6 (e.g. AF_PACKET sockets when sending packets via raw/packet\nsocket over virtual devices such as VRF or ipvlan).\n\nIn such cases, sk_family is not AF_INET/AF_INET6 and sk_mc_loop() falls\nthrough the switch statement and triggers WARN_ON_ONCE(1).\n\nNon-INET sockets do not support IP_MULTICAST_LOOP or IPV6_MULTICAST_LOOP\noptions, so loopback should default to true without generating a warning."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-03T08:21:50.136Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/b8a39a09ae4eaae04309e1e38ed6a1101d967496"
        }
      ],
      "title": "net: remove WARN_ON_ONCE() from sk_mc_loop()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80733",
    "datePublished": "2026-09-03T08:21:50.136Z",
    "dateReserved": "2026-08-26T14:34:25.789Z",
    "dateUpdated": "2026-09-03T08:21:50.136Z",
    "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-MF9R-R7X5-32QQ

CVE-2026-80733 (GCVE-0-2026-80733)

Tags

Sightings

Nomenclature