CVE-2026-5747
Description
A flaw was found in Firecracker, specifically an out-of-bounds write issue within the virtio PCI transport. A local guest user with root privileges can exploit this by modifying virtio queue configuration registers after device activation. This could lead to crashing the Firecracker Virtual Machine Monitor (VMM) process, resulting in a denial of service. Under specific preconditions, such as using a custom guest kernel or certain snapshot configurations, this flaw may also allow for arbitrary code execution on the host system.
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Write operations could cause memory corruption. In some cases, an adversary can modify control data such as return addresses in order to execute unexpected code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
Attempting to access out-of-range, invalid, or unauthorized memory could cause the product to crash.
Other
Technical Impact: Unexpected State
Subsequent write operations can produce undefined or unexpected results.
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