CVE-2026-5747
Out-of-bounds Write in Firecracker virtio-pci Transport
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
2th
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.
| CWE | CWE-787 CWE-369 |
| Vendor | aws |
| Product | firecracker |
| Published | Apr 7, 2026 |
| Last Updated | Apr 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H Attack Vector
Local
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
AWS / Firecracker
1.13.0 ≤ 1.14.3 1.15.0
References
github.com: https://github.com/firecracker-microvm/firecracker/releases/tag/v1.15.1 github.com: https://github.com/firecracker-microvm/firecracker/releases/tag/v1.14.4 aws.amazon.com: https://aws.amazon.com/security/security-bulletins/2026-015-aws/ github.com: https://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-776c-mpj7-jm3r