Vulnerability-Lookup

GHSA-J5M6-467M-H4HW

Vulnerability from github – Published: 2026-04-25 09:30 – Updated: 2026-04-27 15:30

Details

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

openvswitch: validate MPLS set/set_masked payload length

validate_set() accepted OVS_KEY_ATTR_MPLS as variable-sized payload for SET/SET_MASKED actions. In action handling, OVS expects fixed-size MPLS key data (struct ovs_key_mpls).

Use the already normalized key_len (masked case included) and reject non-matching MPLS action key sizes.

Reject invalid MPLS action payload lengths early.

Severity

7.1 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31679"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-25T09:16:01Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nopenvswitch: validate MPLS set/set_masked payload length\n\nvalidate_set() accepted OVS_KEY_ATTR_MPLS as variable-sized payload for\nSET/SET_MASKED actions. In action handling, OVS expects fixed-size\nMPLS key data (struct ovs_key_mpls).\n\nUse the already normalized key_len (masked case included) and reject\nnon-matching MPLS action key sizes.\n\nReject invalid MPLS action payload lengths early.",
  "id": "GHSA-j5m6-467m-h4hw",
  "modified": "2026-04-27T15:30:51Z",
  "published": "2026-04-25T09:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31679"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2ca33b88a79ca42f017ae0f7011280325655438e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4cae986225f8b8679ad86b924918e7d75a96aa61"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/546b68ac893595877ffbd7751e5c55fd1c43ede6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/68f32ef0683c8d1c05cd2e4f16818fa63ff59c6f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ed7b9930cbc3bc71f868fa79a68700ac88d586a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98de18d327ef8cbbb704980e359e4872d8c28997"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bd50c7484c3bb34097571c1334174fb8b7408036"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1f97152df8dfb17e855ddf0fc409b7bd13e9700"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-31679 (GCVE-0-2026-31679)

Vulnerability from cvelistv5 – Published: 2026-04-25 08:46 – Updated: 2026-08-05 12:24

Title

openvswitch: validate MPLS set/set_masked payload length

Summary

In the Linux kernel, the following vulnerability has been resolved: openvswitch: validate MPLS set/set_masked payload length validate_set() accepted OVS_KEY_ATTR_MPLS as variable-sized payload for SET/SET_MASKED actions. In action handling, OVS expects fixed-size MPLS key data (struct ovs_key_mpls). Use the already normalized key_len (masked case included) and reject non-matching MPLS action key sizes. Reject invalid MPLS action payload lengths early.

Severity

7.1 (High)


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

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/68f32ef0683c8d1c0…
https://git.kernel.org/stable/c/4cae986225f8b8679…
https://git.kernel.org/stable/c/8ed7b9930cbc3bc71…
https://git.kernel.org/stable/c/c1f97152df8dfb17e…
https://git.kernel.org/stable/c/98de18d327ef8cbbb…
https://git.kernel.org/stable/c/bd50c7484c3bb3409…
https://git.kernel.org/stable/c/2ca33b88a79ca42f0…
https://git.kernel.org/stable/c/546b68ac893595877…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 , < 68f32ef0683c8d1c05cd2e4f16818fa63ff59c6f (git) Affected: fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 , < 4cae986225f8b8679ad86b924918e7d75a96aa61 (git) Affected: fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 , < 8ed7b9930cbc3bc71f868fa79a68700ac88d586a (git) Affected: fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 , < c1f97152df8dfb17e855ddf0fc409b7bd13e9700 (git) Affected: fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 , < 98de18d327ef8cbbb704980e359e4872d8c28997 (git) Affected: fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 , < bd50c7484c3bb34097571c1334174fb8b7408036 (git) Affected: fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 , < 2ca33b88a79ca42f017ae0f7011280325655438e (git) Affected: fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 , < 546b68ac893595877ffbd7751e5c55fd1c43ede6 (git)
Linux	Linux	Affected: 5.5 Unaffected: 0 , < 5.5 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.131 , ≤ 6.6.* (semver) Unaffected: 6.12.80 , ≤ 6.12.* (semver) Unaffected: 6.18.21 , ≤ 6.18.* (semver) Unaffected: 6.19.11 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/openvswitch/flow_netlink.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "68f32ef0683c8d1c05cd2e4f16818fa63ff59c6f",
              "status": "affected",
              "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3",
              "versionType": "git"
            },
            {
              "lessThan": "4cae986225f8b8679ad86b924918e7d75a96aa61",
              "status": "affected",
              "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3",
              "versionType": "git"
            },
            {
              "lessThan": "8ed7b9930cbc3bc71f868fa79a68700ac88d586a",
              "status": "affected",
              "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3",
              "versionType": "git"
            },
            {
              "lessThan": "c1f97152df8dfb17e855ddf0fc409b7bd13e9700",
              "status": "affected",
              "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3",
              "versionType": "git"
            },
            {
              "lessThan": "98de18d327ef8cbbb704980e359e4872d8c28997",
              "status": "affected",
              "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3",
              "versionType": "git"
            },
            {
              "lessThan": "bd50c7484c3bb34097571c1334174fb8b7408036",
              "status": "affected",
              "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3",
              "versionType": "git"
            },
            {
              "lessThan": "2ca33b88a79ca42f017ae0f7011280325655438e",
              "status": "affected",
              "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3",
              "versionType": "git"
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        },
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.5"
            },
            {
              "lessThan": "5.5",
              "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": "6.6.131",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.80",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.21",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.11",
              "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": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.203",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
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                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.21",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.11",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nopenvswitch: validate MPLS set/set_masked payload length\n\nvalidate_set() accepted OVS_KEY_ATTR_MPLS as variable-sized payload for\nSET/SET_MASKED actions. In action handling, OVS expects fixed-size\nMPLS key data (struct ovs_key_mpls).\n\nUse the already normalized key_len (masked case included) and reject\nnon-matching MPLS action key sizes.\n\nReject invalid MPLS action payload lengths early."
        }
      ],
      "metrics": [
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            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is reached through Open vSwitch generic netlink commands that install or execute datapath actions, not by unauthenticated remote packets alone.\nAC:L - An attacker can craft the malformed MPLS SET/SET_MASKED netlink attributes and an MPLS packet directly; there is no race or victim-controlled timing requirement.\nPR:L - The relevant OVS commands require CAP_NET_ADMIN, but the families are netns-aware and use GENL_UNS_ADMIN_PERM, making them reachable with CAP_NET_ADMIN in a user-created network namespace.\nUI:N - No victim interaction is required once the attacker can send the crafted netlink request or trigger the installed action.\nS:U - The impact remains within the kernel/host networking security authority and does not cross a VM, IOMMU, or similar scope boundary.\nC:H - The invalid MPLS payload length can make action execution read beyond the validated netlink action data from kernel heap storage. Although each read is small, repeated attacker-controlled triggering and heap layout influence make high confidentiality impact the safer defensible choice.\nI:N - The bug causes out-of-bounds reads and attacker-influenced packet MPLS rewriting, but it does not provide a kernel memory write primitive or control-flow modification.\nA:H - The out-of-bounds kernel heap read can trigger a kernel fault or sanitizer-detected panic, and the crafted action can be exercised repeatedly without user interaction."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:24:25.701Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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        },
        {
          "url": "https://git.kernel.org/stable/c/8ed7b9930cbc3bc71f868fa79a68700ac88d586a"
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        {
          "url": "https://git.kernel.org/stable/c/98de18d327ef8cbbb704980e359e4872d8c28997"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd50c7484c3bb34097571c1334174fb8b7408036"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ca33b88a79ca42f017ae0f7011280325655438e"
        },
        {
          "url": "https://git.kernel.org/stable/c/546b68ac893595877ffbd7751e5c55fd1c43ede6"
        }
      ],
      "title": "openvswitch: validate MPLS set/set_masked payload length",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31679",
    "datePublished": "2026-04-25T08:46:55.584Z",
    "dateReserved": "2026-03-09T15:48:24.130Z",
    "dateUpdated": "2026-08-05T12:24:25.701Z",
    "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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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GHSA-J5M6-467M-H4HW

CVE-2026-31679 (GCVE-0-2026-31679)

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