Vulnerability-Lookup

GHSA-7CJ7-4X33-PJX2

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

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.

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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": null
  },
  "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": "2026-05-01T15:30:34Z",
  "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": []
}

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

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

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

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

Vendor

Product

Version

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)

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)

Show details on NVD website

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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",
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa",
              "versionType": "git"
            },
            {
              "lessThan": "2029712fb2c87e9a8c75094906f2ee29bf08c500",
              "status": "affected",
              "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa",
              "versionType": "git"
            },
            {
              "lessThan": "602596c69a70e50d9ab8c6ae0290a01f88229dd7",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "de20d2e3b9179d132f5f5b44e490d7c916c6321b",
              "status": "affected",
              "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa",
              "versionType": "git"
            },
            {
              "lessThan": "eddfce70a6f3107d1679b0c2fcbeb96b593bd679",
              "status": "affected",
              "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa",
              "versionType": "git"
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              "versionType": "git"
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            {
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              "versionType": "git"
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            {
              "status": "affected",
              "version": "3927dace523706cc00f808520eaf2125dd7c07b5",
              "versionType": "git"
            }
          ]
        },
        {
          "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
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.203",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.168",
                  "versionStartIncluding": "3.14",
                  "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:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.12",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                },
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          "value": "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."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-05-01T14:14:34.900Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958"
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          "url": "https://git.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3"
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        {
          "url": "https://git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500"
        },
        {
          "url": "https://git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7"
        },
        {
          "url": "https://git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b"
        },
        {
          "url": "https://git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679"
        },
        {
          "url": "https://git.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1"
        },
        {
          "url": "https://git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385"
        }
      ],
      "title": "vxlan: validate ND option lengths in vxlan_na_create",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31738",
    "datePublished": "2026-05-01T14:14:34.900Z",
    "dateReserved": "2026-03-09T15:48:24.138Z",
    "dateUpdated": "2026-05-01T14:14:34.900Z",
    "state": "PUBLISHED"
  },
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  "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.

Action not permitted

GHSA-7CJ7-4X33-PJX2

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

Tags

Sightings

Nomenclature