Vulnerability-Lookup

FKIE_CVE-2026-5747

Vulnerability from fkie_nvd - Published: 2026-04-08 00:16 - Updated: 2026-07-24 09:10

Severity

7.5 (High) - CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Summary

An out-of-bounds write issue in the virtio PCI transport in Firecracker 1.13.0 through 1.14.3 and 1.15.0 on x86_64 and aarch64 might allow a local guest user with root privileges to crash the Firecracker VMM process or potentially execute arbitrary code on the host via modification of virtio queue configuration registers after device activation. Achieving code execution on the host requires additional preconditions, such as the use of a custom guest kernel or specific snapshot configurations. To remediate this, users should upgrade to Firecracker 1.14.4 or 1.15.1 and later.

References

URL	Tags
ff89ba41-3aa1-4d27-914a-91399e9639e5	https://aws.amazon.com/security/security-bulletins/2026-015-aws/	Vendor Advisory
ff89ba41-3aa1-4d27-914a-91399e9639e5	https://github.com/firecracker-microvm/firecracker/releases/tag/v1.14.4	Release Notes
ff89ba41-3aa1-4d27-914a-91399e9639e5	https://github.com/firecracker-microvm/firecracker/releases/tag/v1.15.1	Release Notes
ff89ba41-3aa1-4d27-914a-91399e9639e5	https://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-776c-mpj7-jm3r	Vendor Advisory

Impacted products

Vendor	Product	Version
amazon	firecracker	*
amazon	firecracker	1.15.0
amazon	firecracker	1.15.0

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Firecracker",
          "vendor": "AWS",
          "versions": [
            {
              "lessThanOrEqual": "1.14.3",
              "status": "affected",
              "version": "1.13.0",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "1.15.0"
            },
            {
              "status": "unaffected",
              "version": "1.14.4"
            },
            {
              "status": "unaffected",
              "version": "1.15.1"
            }
          ]
        }
      ],
      "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:amazon:firecracker:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "4662887D-1027-4734-9918-3E477F871CC8",
              "versionEndIncluding": "1.14.3",
              "versionStartIncluding": "1.13.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:amazon:firecracker:1.15.0:-:*:*:*:*:*:*",
              "matchCriteriaId": "B5F6B773-4741-4E73-9DFD-9AA3F640A224",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:amazon:firecracker:1.15.0:dev:*:*:*:*:*:*",
              "matchCriteriaId": "D90FD91D-C30F-40F4-8138-9D1A3EA496D9",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An out-of-bounds write issue in the virtio PCI transport in Firecracker 1.13.0 through 1.14.3 and 1.15.0 on x86_64 and aarch64 might allow a local guest user with root privileges to crash the Firecracker VMM process or potentially execute arbitrary code on the host via modification of virtio queue configuration registers after device activation. Achieving code execution on the host requires additional preconditions, such as the use of a custom guest kernel or specific snapshot configurations.\n\nTo remediate this, users should upgrade to Firecracker 1.14.4 or 1.15.1 and later."
    },
    {
      "lang": "es",
      "value": "Un problema de escritura fuera de l\u00edmites en el transporte PCI de virtio en Amazon Firecracker 1.13.0 hasta 1.14.3 y 1.15.0 en x86_64 y aarch64 podr\u00eda permitir a un usuario invitado local con privilegios de root bloquear el proceso VMM de Firecracker o potencialmente ejecutar c\u00f3digo arbitrario en el host mediante la modificaci\u00f3n de los registros de configuraci\u00f3n de la cola virtio despu\u00e9s de la activaci\u00f3n del dispositivo. Lograr la ejecuci\u00f3n de c\u00f3digo en el host requiere precondiciones adicionales, como el uso de un kernel invitado personalizado o configuraciones de instant\u00e1neas espec\u00edficas.\n\nPara remediar esto, los usuarios deben actualizar a Firecracker 1.14.4 o 1.15.1 y versiones posteriores."
    }
  ],
  "id": "CVE-2026-5747",
  "lastModified": "2026-07-24T09:10:00.153",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 0.8,
        "impactScore": 6.0,
        "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "HIGH",
          "attackRequirements": "PRESENT",
          "attackVector": "LOCAL",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.7,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "HIGH",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "HIGH",
          "subConfidentialityImpact": "HIGH",
          "subIntegrityImpact": "HIGH",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-5747",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-08T15:15:52.161794Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-08T00:16:05.657",
  "references": [
    {
      "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://aws.amazon.com/security/security-bulletins/2026-015-aws/"
    },
    {
      "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/firecracker-microvm/firecracker/releases/tag/v1.14.4"
    },
    {
      "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/firecracker-microvm/firecracker/releases/tag/v1.15.1"
    },
    {
      "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-776c-mpj7-jm3r"
    }
  ],
  "sourceIdentifier": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-369"
        },
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
      "type": "Secondary"
    }
  ]
}

CVE-2026-5747 (GCVE-0-2026-5747)

Vulnerability from cvelistv5 – Published: 2026-04-07 23:17 – Updated: 2026-04-20 17:24

Title

Out-of-bounds Write in Firecracker virtio-pci Transport

Summary

Severity

7.5 (High)


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

8.7 (High)


                        
                          CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-08 15:15 UTC

CWE

CWE-787 - Out-of-bounds write
CWE-369 - Divide by zero

Assigner

AMZN mitre root

References

4 references

URL	Tags
https://github.com/firecracker-microvm/firecracke…	patch
https://github.com/firecracker-microvm/firecracke…	patch
https://aws.amazon.com/security/security-bulletin…	vendor-advisory
https://github.com/firecracker-microvm/firecracke…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
AWS	Firecracker	Affected: 1.13.0 , ≤ 1.14.3 (custom) Affected: 1.15.0 Unaffected: 1.14.4 Unaffected: 1.15.1

Credits

Anthropic

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-5747",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-08T15:15:52.161794Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-08T15:15:58.759Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Firecracker",
          "vendor": "AWS",
          "versions": [
            {
              "lessThanOrEqual": "1.14.3",
              "status": "affected",
              "version": "1.13.0",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "1.15.0"
            },
            {
              "status": "unaffected",
              "version": "1.14.4"
            },
            {
              "status": "unaffected",
              "version": "1.15.1"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Anthropic"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eAn out-of-bounds write issue in the virtio PCI transport in Firecracker 1.13.0 through 1.14.3 and 1.15.0 on x86_64 and aarch64 might allow a local guest user with root privileges to crash the Firecracker VMM process or potentially execute arbitrary code on the host via modification of virtio queue configuration registers after device activation. Achieving code execution on the host requires additional preconditions, such as the use of a custom guest kernel or specific snapshot configurations.\u003c/p\u003e\u003cp\u003eTo remediate this, users should upgrade to Firecracker 1.14.4 or 1.15.1 and later.\u003c/p\u003e"
            }
          ],
          "value": "An out-of-bounds write issue in the virtio PCI transport in Firecracker 1.13.0 through 1.14.3 and 1.15.0 on x86_64 and aarch64 might allow a local guest user with root privileges to crash the Firecracker VMM process or potentially execute arbitrary code on the host via modification of virtio queue configuration registers after device activation. Achieving code execution on the host requires additional preconditions, such as the use of a custom guest kernel or specific snapshot configurations.\n\nTo remediate this, users should upgrade to Firecracker 1.14.4 or 1.15.1 and later."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-100",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-100 Overflow Buffers"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
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            "privilegesRequired": "HIGH",
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          "scenarios": [
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            "Recovery": "NOT_DEFINED",
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            "attackVector": "LOCAL",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "HIGH",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
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            "valueDensity": "NOT_DEFINED",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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              "description": "CWE-787 Out-of-bounds write",
              "lang": "en",
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        {
          "descriptions": [
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      "providerMetadata": {
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          "url": "https://github.com/firecracker-microvm/firecracker/releases/tag/v1.14.4"
        },
        {
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          ],
          "url": "https://aws.amazon.com/security/security-bulletins/2026-015-aws/"
        },
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-776c-mpj7-jm3r"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Out-of-bounds Write in Firecracker virtio-pci Transport",
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  "cveMetadata": {
    "assignerOrgId": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
    "assignerShortName": "AMZN",
    "cveId": "CVE-2026-5747",
    "datePublished": "2026-04-07T23:17:23.944Z",
    "dateReserved": "2026-04-07T14:39:46.309Z",
    "dateUpdated": "2026-04-20T17:24:32.674Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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}

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.

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.

Action not permitted

FKIE_CVE-2026-5747

CVE-2026-5747 (GCVE-0-2026-5747)

Tags

Sightings

Nomenclature