---
id: CVE-2026-122192
title: Guest access to Firecracker process memory after a failed memory discard
summary: >-
  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
  microVM…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-390
  - CWE-825
vendor: AWS
product: firecracker
affected:
  - firecracker >= 0.23.0 < 1.16.2
published: '2026-11-04'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T19:35:51.555Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-122192'
references:
  - url: 'https://github.com/firecracker-microvm/firecracker/releases/tag/v1.16.2'
  - url: 'https://github.com/firecracker-microvm/firecracker/releases/tag/v1.17.0'
  - url: 'https://aws.amazon.com/security/security-bulletins/2026-169-aws/'
  - url: >-
      https://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-48ww-rqpp-2mgm
tags:
  - cve.org
ingestedAt: '2026-11-05T21:36:00.521Z'
---

## Overview

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.

## Affected

- `firecracker >= 0.23.0 < 1.16.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.