CVE-2026-5747

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.

Affected Software

VendorProductVersion RangeStatus
AWSFirecracker1.13.0 <= 1.14.3affected
AWSFirecracker1.15.0affected
AWSFirecracker1.14.4unaffected
AWSFirecracker1.15.1unaffected

Weaknesses

  • CWE-787: CWE-787 Out-of-bounds write
  • CWE-369: CWE-369 Divide by zero

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References