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

Vulnerability from cvelistv5 – Published: 2026-05-01 14:14 – Updated: 2026-05-23 16:05
VLAI
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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                    "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*",
                    "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*",
                    "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "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."
          }
        ],
        "id": "CVE-2026-31738",
        "lastModified": "2026-06-17T10:34:20.430",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-05-01T15:16:36.473",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:27:53+00:00",
      "cve": "CVE-2026-31738",
      "id": "CVE-2026-31738",
      "initial_release_date": "2026-05-01T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vxlan: validate ND option lengths in vxlan_na_create",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31738.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-11T01:29:05Z",
      "cve": "CVE-2026-31738",
      "id": "CVE-2026-31738",
      "initial_release_date": "2026-05-06T01:43:15Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "505",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "684",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31738",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31738.json",
      "version": "38"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.