Read the docs
TI-2026-05038 Aliases CVE-2026-5747

Out-of-bounds Write in Firecracker virtio-pci Transport

Priority LOW 39CWE-369Published · Updated

Key facts

Attack vector
Local
Privileges required
High
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Denial of service, Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-369, CWE-787 and the CVSS impact.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00266 18th percentileScored 2026-11-07
Fix Fixed Firecracker (AWS): 1.14.4, 1.15.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
AWSFirecracker1.13.0 – 1.14.3; 1.15.01.14.4, 1.15.1Patch availableCNA
  • Firecracker VendorAWS Affected 1.13.0 – 1.14.3; 1.15.0 Fixed in 1.14.4, 1.15.1 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:amazon:firecracker:*:*:*:*:*:*:*:*1.13.0 – 1.14.3VulnerableAWS
cpe:2.3:a:amazon:firecracker:1.15.0:-:*:*:*:*:*:*1.15.0VulnerableAWS
cpe:2.3:a:amazon:firecracker:1.15.0:dev:*:*:*:*:*:*1.15.0 devVulnerableAWS
  • cpe:2.3:a:amazon:firecracker:*:*:*:*:*:*:*:* Versions 1.13.0 – 1.14.3 Vulnerable ·AWS
  • cpe:2.3:a:amazon:firecracker:1.15.0:-:*:*:*:*:*:* Versions 1.15.0 Vulnerable ·AWS
  • cpe:2.3:a:amazon:firecracker:1.15.0:dev:*:*:*:*:*:* Versions 1.15.0 dev Vulnerable ·AWS

Remediation

  • Fix · CNA Firecracker (AWS) Fixed in 1.14.4, 1.15.1

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-5747

References

Patch 2

Advisory 2

  • TI-2019-13671 Firecracker vsock implementation buffer overflow in versions 0.18.0 and 0.19.0. CVSS 3.1CRITICAL 9.8
  • TI-2020-16517 In Amazon AWS Firecracker before 0.21.3, and 0.22.x before 0.22.1, the serial console… CVSS 3.1HIGH 7.5
  • TI-2020-12848 In Firecracker 0.20.x before 0.20.1 and 0.21.x before 0.21.2, the network stack can… CVSS 3.1MEDIUM 5.9
  • TI-2026-01085 Arbitrary Host File Overwrite via Symlink in Firecracker Jailer CVSS 4.0MEDIUM 6.0

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences