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TI-2026-85143 Aliases CVE-2026-122192

Guest root can access Firecracker VMM memory after failed remap

Priority LOW 30CWE-390Published · Updated

Key facts

Attack vector
Local
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

AWS Firecracker versions from 0.23.0 before 1.16.2 are affected. Improper handling of a failed memory remap (CWE-390) lets a guest user with root privileges read or modify Firecracker VMM process memory through balloon or virtio-mem discard requests. This applies to microVMs restored from a snapshot with the File memory backend when the host fails to create the replacement mapping.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

Improper handling of a failed memory remap in Firecracker versions 0.23.0 through 1.16.1 might allow a guest user with root privileges to read or modify Firecracker VMM process memory via balloon or virtio-mem discard requests on microVMs restored from a snapshot with the File memory backend, if the host fails to create the replacement mapping. To remediate this issue, users should upgrade to Firecracker 1.16.2 or 1.17.0 and later.

Why it matters now

EPSS 0.00157 4th percentileScored 2026-11-07
Fix Fixed firecracker (AWS): 1.16.2

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
AWSfirecracker0.23.0 to before 1.16.21.16.2Patch availableCNA
  • firecracker VendorAWS Affected 0.23.0 to before 1.16.2 Fixed in 1.16.2 Patch available CNA

Remediation

Upgrade Firecracker to 1.16.2 to fix this issue, or to 1.17.0 and later.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA firecracker (AWS) Fixed in 1.16.2

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-11-04 Threatist record created from CVE-2026-122192
  2. 2026-11-06 Priority changed: MEDIUM → LOW
  3. 2026-11-06 Affected versions changed · Red Hat
  4. 2026-11-06 CVSS score added · Red Hat

References

Patch 2

Advisory 2

  • TI-2026-23989 crypto: algif_aead - Revert to operating out-of-place KEVCVSS 3.1HIGH 7.8
  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2024-18648 Amazon AWS Amplify CLI before 12.10.1 incorrectly configures the role trust policy of IAM… CVSS 3.1CRITICAL 9.8
  • TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
  • TI-2025-03847 Input validation issue in AWS Amplify Studio UI component properties CVSS 4.0CRITICAL 9.0
  • TI-2026-11603 HTTP/2 Stream Parser Confusion Body-Inspection Bypass in Amazon CloudFront with AWS WAF CVSS 4.0HIGH 7.9
See all 383 →

Sources

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