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CVE-2026-5747NVD
Vulnerability Summary
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.
To remediate this, users should upgrade to Firecracker 1.14.4 or 1.15.1 and later.
CVSS v4.0 Base Metrics — Score 8.7 (HIGH)
Attack VectorLocal
Attack ComplexityHigh
Attack RequirementsPresent
Privileges RequiredHigh
User InteractionNone
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 v3.1 Base Metrics — Score 7.5 (HIGH)
Attack VectorLocal
Attack ComplexityHigh
Privileges RequiredHigh
User InteractionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected & Patched Versions
- AWS Firecracker >= 1.13.0 and <= 1.14.3
- AWS Firecracker >= 1.15.0
- AWS Firecracker 1.14.3