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

unknownCVE-2026-5747
Bulletin ID: 2026-015-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 2026/04/07 15:30 PM PDT Description: Firecracker is an open source virtualization technology that is purpose-built for creating and managing secure, multi-tenant container and function-based services. We identified CVE-2026-5747, 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 that 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. No AWS service is affected. Impacted versions: Firecracker >= 1.13.0 AND <= 1.14.3 AND 1.15.0 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.

CSIRTS triage

vendor: Firecrackerproduct: FirecrackerRemote code executionOtheraffected: 1.13.0 - 1.14.3, 1.15.0
What
An out-of-bounds write issue in the virtio PCI transport may allow a local guest user to crash the Firecracker VMM process or execute arbitrary code on the host.
Who is affected
Local guest users with root privileges on Firecracker versions 1.13.0 through 1.14.3 and 1.15.0.
Urgency
Remediation is urgent due to the potential for arbitrary code execution on the host.
Action
Upgrade to a patched version of Firecracker.

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Details

Source
AWS Security Bulletins (INTL · vendor-psirt · site)
Severity
unknown
Published
2026-06-05
Exploitation
Not in CISA KEV at last sync

Original advisory: https://aws.amazon.com/security/security-bulletins/rss/2026-015-aws/

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-5747coverage & exploitation statusNVD · CVE.org

Recent advisories for - Out-of-bounds Write

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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