CVE-2026-5747
Out-of-bounds Write in Firecracker virtio-pci Transport
- State
- Published
- Severity
- 8.7 High
- Published
- Apr 7, 2026
- Updated
- Apr 20, 2026
- Reserved
- Apr 7, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 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 | AMZN |
| 3.1 | 7.5 High | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H | AMZN |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
FirecrackerAWS |
|
References
- https://github.com/firecracker-microvm/firecracker/releases/tag/v1.15.1patch
- https://github.com/firecracker-microvm/firecracker/releases/tag/v1.14.4patch
- https://aws.amazon.com/security/security-bulletins/2026-015-aws/vendor-advisory
- https://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-776c-mpj7-jm3rthird-party-advisory
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