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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.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Aws
Products
Firecracker
CVE-2026-5747

Out-of-bounds Write in Firecracker virtio-pci Transport

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. To remediate this, users should upgrade to Firecracker 1.14.4 or 1.15.1 and later.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Amazon Aws
Products
Firecracker Firecracker