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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
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.
- Record
CVE-2026-122192- CVSS 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 - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-390, CWE-825
- Updated
- 2026-11-04
EUVDEUVD-2026-117056
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.
- Record
EUVD-2026-117056- CVSS 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 - Updated
- 2026-11-04
NVD
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.
- Record
CVE-2026-122192- CVSS 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/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
- 7.5 High
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-390, CWE-825
- Updated
- 2026-11-04
OSV
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.
- Record
CVE-2026-122192- CVSS 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 - Weakness
- CWE-390, CWE-825
- Updated
- 2026-11-05
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, references | OSV | |
| first indexed | CVE List, EUVD, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-122192 is a high vulnerability (CVSS 7.1) in Aws Firecracker, published November 4, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.16%, the 4th percentile. No source names a fixed version.
References
github.com/firecracker-microvm/firecracker/releases/tag/v1.16.2
aws.amazon.com/security/security-bulletins/2026-169-aws
nvd.nist.gov/vuln/detail/CVE-2026-122192