Vulnerability-Lookup

GHSA-7CJ7-4X33-PJX2

Vulnerability from github – Published: 2026-05-01 15:30 – Updated: 2026-05-07 21:30

Details

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

vxlan: validate ND option lengths in vxlan_na_create

vxlan_na_create() walks ND options according to option-provided lengths. A malformed option can make the parser advance beyond the computed option span or use a too-short source LLADDR option payload.

Validate option lengths against the remaining NS option area before advancing, and only read source LLADDR when the option is large enough for an Ethernet address.

Severity

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31738"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-01T15:16:36Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: validate ND option lengths in vxlan_na_create\n\nvxlan_na_create() walks ND options according to option-provided\nlengths. A malformed option can make the parser advance beyond the\ncomputed option span or use a too-short source LLADDR option payload.\n\nValidate option lengths against the remaining NS option area before\nadvancing, and only read source LLADDR when the option is large enough\nfor an Ethernet address.",
  "id": "GHSA-7cj7-4x33-pjx2",
  "modified": "2026-05-07T21:30:23Z",
  "published": "2026-05-01T15:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31738"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-31738 (GCVE-0-2026-31738)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:14 – Updated: 2026-05-23 16:05

Title

vxlan: validate ND option lengths in vxlan_na_create

Summary

In the Linux kernel, the following vulnerability has been resolved: vxlan: validate ND option lengths in vxlan_na_create vxlan_na_create() walks ND options according to option-provided lengths. A malformed option can make the parser advance beyond the computed option span or use a too-short source LLADDR option payload. Validate option lengths against the remaining NS option area before advancing, and only read source LLADDR when the option is large enough for an Ethernet address.

Severity

No CVSS data available.

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/901c1dd3bab2955d7…
https://git.kernel.org/stable/c/e476745917a1e288e…
https://git.kernel.org/stable/c/2029712fb2c87e9a8…
https://git.kernel.org/stable/c/602596c69a70e50d9…
https://git.kernel.org/stable/c/de20d2e3b9179d132…
https://git.kernel.org/stable/c/eddfce70a6f3107d1…
https://git.kernel.org/stable/c/b69c4236255bd8de1…
https://git.kernel.org/stable/c/afa9a05e6c4971bd5…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa , < 901c1dd3bab2955d7e664f914c374c8c3ac2b958 (git) Affected: 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa , < e476745917a1e288eb15e7ff49d286a86a4861d3 (git) Affected: 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa , < 2029712fb2c87e9a8c75094906f2ee29bf08c500 (git) Affected: 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa , < 602596c69a70e50d9ab8c6ae0290a01f88229dd7 (git) Affected: 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa , < de20d2e3b9179d132f5f5b44e490d7c916c6321b (git) Affected: 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa , < eddfce70a6f3107d1679b0c2fcbeb96b593bd679 (git) Affected: 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa , < b69c4236255bd8de16cd876e58c6f0867d1d78b1 (git) Affected: 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa , < afa9a05e6c4971bd5586f1b304e14d61fb3d9385 (git) Affected: d8be18c52dbc94989f6d74637b731af39cd3d902 (git) Affected: 3927dace523706cc00f808520eaf2125dd7c07b5 (git) Affected: 3.12.18 , < 3.13 (semver) Affected: 3.13.10 , < 3.14 (semver)
Linux	Linux	Affected: 3.14 Unaffected: 0 , < 3.14 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.134 , ≤ 6.6.* (semver) Unaffected: 6.12.81 , ≤ 6.12.* (semver) Unaffected: 6.18.22 , ≤ 6.18.* (semver) Unaffected: 6.19.12 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/vxlan/vxlan_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "901c1dd3bab2955d7e664f914c374c8c3ac2b958",
              "status": "affected",
              "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa",
              "versionType": "git"
            },
            {
              "lessThan": "e476745917a1e288eb15e7ff49d286a86a4861d3",
              "status": "affected",
              "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa",
              "versionType": "git"
            },
            {
              "lessThan": "2029712fb2c87e9a8c75094906f2ee29bf08c500",
              "status": "affected",
              "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa",
              "versionType": "git"
            },
            {
              "lessThan": "602596c69a70e50d9ab8c6ae0290a01f88229dd7",
              "status": "affected",
              "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa",
              "versionType": "git"
            },
            {
              "lessThan": "de20d2e3b9179d132f5f5b44e490d7c916c6321b",
              "status": "affected",
              "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa",
              "versionType": "git"
            },
            {
              "lessThan": "eddfce70a6f3107d1679b0c2fcbeb96b593bd679",
              "status": "affected",
              "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa",
              "versionType": "git"
            },
            {
              "lessThan": "b69c4236255bd8de16cd876e58c6f0867d1d78b1",
              "status": "affected",
              "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa",
              "versionType": "git"
            },
            {
              "lessThan": "afa9a05e6c4971bd5586f1b304e14d61fb3d9385",
              "status": "affected",
              "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d8be18c52dbc94989f6d74637b731af39cd3d902",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3927dace523706cc00f808520eaf2125dd7c07b5",
              "versionType": "git"
            },
            {
              "lessThan": "3.13",
              "status": "affected",
              "version": "3.12.18",
              "versionType": "semver"
            },
            {
              "lessThan": "3.14",
              "status": "affected",
              "version": "3.13.10",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/vxlan/vxlan_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.14"
            },
            {
              "lessThan": "3.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.168",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.134",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.81",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.253",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
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                {
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.134",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.81",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.22",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                  "versionStartIncluding": "3.12.18",
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        }
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      "providerMetadata": {
        "dateUpdated": "2026-05-23T16:05:52.050Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        {
          "url": "https://git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500"
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          "url": "https://git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7"
        },
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          "url": "https://git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b"
        },
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          "url": "https://git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679"
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        },
        {
          "url": "https://git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385"
        }
      ],
      "title": "vxlan: validate ND option lengths in vxlan_na_create",
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      }
    }
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31738",
    "datePublished": "2026-05-01T14:14:34.900Z",
    "dateReserved": "2026-03-09T15:48:24.138Z",
    "dateUpdated": "2026-05-23T16:05:52.050Z",
    "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.

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-7CJ7-4X33-PJX2

CVE-2026-31738 (GCVE-0-2026-31738)

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