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CVE-2026-5747— Out-of-bounds Write in Firecracker virtio-pci Transport

Quick assessment

Affected
AWS Firecracker
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Amazon Firecracker是美国亚马逊（Amazon）公司的一种专门用于创建和管理多租户容器和基于函数的服务的虚拟化技术。它是一种虚拟化技术，提供 Serverless 操作模型，专门用于创建和管理多租户容器与基于函数的服务。 Amazon Firecracker 1.13.0至1.14.3版本和1.15.0版本存在安全漏洞，该漏洞源于virtio PCI传输中存在越界写入问题，可能导致具有root权限的本地访客用户崩溃Firecracker VMM进程或在主机上执行任意代码。

CVSS 7.5 · High EPSS 0.21% · P10
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I. Basic Information for CVE-2026-5747

Vulnerability Information
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Vulnerability Title
Out-of-bounds Write in Firecracker virtio-pci Transport
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
Amazon Firecracker 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Amazon Firecracker是美国亚马逊（Amazon）公司的一种专门用于创建和管理多租户容器和基于函数的服务的虚拟化技术。它是一种虚拟化技术，提供 Serverless 操作模型，专门用于创建和管理多租户容器与基于函数的服务。 Amazon Firecracker 1.13.0至1.14.3版本和1.15.0版本存在安全漏洞，该漏洞源于virtio PCI传输中存在越界写入问题，可能导致具有root权限的本地访客用户崩溃Firecracker VMM进程或在主机上执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS Firecracker 1.13.0 ~ 1.14.3 -

II. Public POCs for CVE-2026-5747

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III. Intelligence Information for CVE-2026-5747

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Vendor Pages for CVE-2026-5747 (2)

IV. Related Vulnerabilities

Same product: Firecracker
Same vendor: AWS
Same weakness: CWE-787

V. Comments for CVE-2026-5747

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