CVE-2026-122192
Guest access to Firecracker process memory after a failed memory discard
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.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: AMZNFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: AMZNAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| firecracker AWS |
≥ 0.23.0; < 1.16.2 (affected, custom)
Other versions: unaffected |
CNA: AMZN |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.5 high |
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H | CNA: AMZN |
| 4.0 / 7.1 high |
CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | CNA: AMZN |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/firecracker-microvm/firecracker/releases/tag/v1.16.2CNA: AMZN · release-notes, patch
- https://github.com/firecracker-microvm/firecracker/releases/tag/v1.17.0CNA: AMZN · release-notes, patch
- https://aws.amazon.com/security/security-bulletins/2026-169-aws/CNA: AMZN · vendor-advisory
- https://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-48ww-rqpp-2mgmCNA: AMZN · third-party-advisory
For agents and automation
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