CVE-2026-40393

{
  "id": "CVE-2026-40393",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-12T19:16:20.797",
  "lastModified": "2026-10-26T21:10:00.170",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In Mesa before 25.3.6 and 26 before 26.0.1, out-of-bounds memory access can occur in WebGPU because the amount of to-be-allocated data depends on an untrusted party, and is then used for alloca."
    },
    {
      "lang": "es",
      "value": "En Mesa antes de 25.3.6 y 26 antes de 26.0.1, puede ocurrir un acceso a memoria fuera de límites en WebGPU porque la cantidad de datos a asignar depende de una parte no confiable, y luego se utiliza para alloca."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "mesa3d",
          "product": "Mesa",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "lessThan": "25.3.6",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "26.0.0",
              "lessThan": "26.0.1",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.9
      },
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-04-13T15:46:57.488673Z",
          "id": "CVE-2026-40393",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:mesa3d:mesa:*:*:*:*:*:*:*:*",
              "versionEndExcluding": "25.3.6",
              "matchCriteriaId": "89D70296-F399-4480-B0DE-63B0B30626E3"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:mesa3d:mesa:26.0.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "0AA825BC-1256-4D8E-96E1-3E67CC9867EB"
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  ],
  "references": [
    {
      "url": "https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39866",
      "source": "[email protected]",
      "tags": [
        "Issue Tracking"
      ]
    },
    {
      "url": "https://lists.freedesktop.org/archives/mesa-dev/2026-February/226597.html",
      "source": "[email protected]",
      "tags": [
        "Issue Tracking",
        "Mailing List"
      ]
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2026/07/msg00021.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ]
}