{"id":"CVE-2026-5747","state":"PUBLISHED","title":"Out-of-bounds Write in Firecracker virtio-pci Transport","description":"An out-of-bounds write issue in the virtio PCI transport in Firecracker 1.13.0 through 1.14.3 and 1.15.0 on x86_64 and aarch64 might allow a local guest user with root privileges to crash the Firecracker VMM process or potentially execute arbitrary code on the host via modification of virtio queue configuration registers after device activation. Achieving code execution on the host requires additional preconditions, such as the use of a custom guest kernel or specific snapshot configurations.\n\nTo remediate this, users should upgrade to Firecracker 1.14.4 or 1.15.1 and later.","publishedAt":"2026-04-07T23:17:23.944Z","updatedAt":"2026-04-20T17:24:32.674Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","source":"AMZN"},"assigner":"AMZN","products":["AWS Firecracker"],"affected":[{"vendor":"AWS","product":"Firecracker","defaultStatus":"unaffected","versions":[{"version":"1.13.0","status":"affected","lessThanOrEqual":"1.14.3","versionType":"custom"},{"version":"1.15.0","status":"affected"},{"version":"1.14.4","status":"unaffected"},{"version":"1.15.1","status":"unaffected"}]}],"references":["https://github.com/firecracker-microvm/firecracker/releases/tag/v1.15.1","https://github.com/firecracker-microvm/firecracker/releases/tag/v1.14.4","https://aws.amazon.com/security/security-bulletins/2026-015-aws/","https://github.com/firecracker-microvm/firecracker/security/advisories/GHSA-776c-mpj7-jm3r"],"weaknesses":["CWE-787","CWE-369"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/5xxx/CVE-2026-5747.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-5747","state":"PUBLISHED","datePublished":"2026-04-07T23:17:23.944Z","dateUpdated":"2026-04-20T17:24:32.674Z","assignerShortName":"AMZN","assignerOrgId":"ff89ba41-3aa1-4d27-914a-91399e9639e5","dateReserved":"2026-04-07T14:39:46.309Z"},"containers":{"cna":{"title":"Out-of-bounds Write in Firecracker virtio-pci Transport","descriptions":[{"lang":"en","value":"An out-of-bounds write issue in the virtio PCI transport in Firecracker 1.13.0 through 1.14.3 and 1.15.0 on x86_64 and aarch64 might allow a local guest user with root privileges to crash the Firecracker VMM process or potentially execute arbitrary code on the host via modification of virtio queue configuration registers after device activation. 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