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.
CVSS breakdown
CVSS 4.0
Attack Vector
Local
Attack Complexity
High
Attack Requirements
Present
Privileges Required
High
User Interaction
None
Confidentiality (Vulnerable System)
High
Integrity (Vulnerable System)
High
Availability (Vulnerable System)
High
Confidentiality (Subsequent System)
High
Integrity (Subsequent System)
High
Availability (Subsequent System)
High
CVSS 3.1
Attack Vector
Local
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected products
- AWS / Firecracker1.13.0 – 1.14.3
- AWS / Firecracker1.15.0 – 1.15.0
- AWS / Firecracker1.14.4 – 1.14.4
- AWS / Firecracker1.15.1 – 1.15.1
References
- PATCHhttps://github.com/firecracker-microvm/firecracker/releases/tag/v1.15.1
- PATCHhttps://github.com/firecracker-microvm/firecracker/releases/tag/v1.14.4
- MISChttps://aws.amazon.com/security/security-bulletins/2026-015-aws/
- VENDOR_ADVISORYhttps://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-776c-mpj7-jm3r