{"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","slug":"CVE-2026-122192","body":"## Overview\n\nImproper 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.\n\n\n\nTo remediate this issue, users should upgrade to Firecracker 1.16.2 or 1.17.0 and later.\n\n## Affected\n\n- `firecracker >= 0.23.0 < 1.16.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}