An out-of-bounds write issue in the virtio PCI transport in Amazon 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.

Attack Vector Local

Attack Complexity High

Privileges Required High

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact High

Subsequent System Availability Impact High

Attack Vector Local

Attack Complexity High

Privileges Required High

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
AWS Firecracker unaffected
Version Status Constraints
1.13.0 affected ≤ 1.14.3
1.15.0 affected —
1.14.4 unaffected —
1.15.1 unaffected —

No data.

No data.

No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://aws.amazon.com/security/security-bulletins/2026-015-aws/ cve-icon cve-icon
https://github.com/firecracker-microvm/firecracker/releases/tag/v1.14.4 cve-icon cve-icon
https://github.com/firecracker-microvm/firecracker/releases/tag/v1.15.1 cve-icon cve-icon
https://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-776c-mpj7-jm3r cve-icon cve-icon
History

Tue, 07 Apr 2026 23:30:00 +0000

Type Values Removed Values Added
Description An out-of-bounds write issue in the virtio PCI transport in Amazon 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.
Title Out-of-bounds Write in Firecracker virtio-pci Transport
Weaknesses CWE-369
CWE-787
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.7, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-04-07T23:20:00.805Z

Reserved: 2026-04-07T14:39:46.309Z

Link: CVE-2026-5747

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-04-08T00:16:05.657

Modified: 2026-04-08T00:16:05.657

Link: CVE-2026-5747

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses