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 Details

CVSS 4.0 Base Score: 7.1 (HIGH)
CVSS 4.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)
CVSS 3.1 Base Score: 7.5
CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H)

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CVSS Details

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CVE-2026-122192: AWS firecracker: Improper handling of a failed memory remap in Firecracker versions 0.23.0 through 1.16.1 might allow a guest user with…

CVSS Details

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