CVE-2026-122192 PUBLISHED

Guest access to Firecracker process memory after a failed memory discard

Assigner: AMZN
Reserved: 04.11.2026 Published: 04.11.2026 Updated: 04.11.2026

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.

CVSS Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 7.5

Attack Vector	Local	Scope	Changed
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	High	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

CVSS Vector: 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
CVSS Score: 7.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Local	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	High
User Interaction	None

CVSS 4.0

Product Status

Vendor	AWS
Product	firecracker
Versions	Default: unaffected affected from 0.23.0 to 1.16.2 (excl.)

Credits

Coinspect finder

References

Problem Types

CWE-390 Detection of error condition without action CWE
CWE-825 Expired pointer dereference CWE

Impacts

CAPEC-130 Excessive Allocation
CAPEC-129 Pointer Manipulation