CVE-2017-3226: Denx U-Boot

Medium severity, CVSS 6.4. EPSS: 0.3% chance of exploitation in the next 30 days.

Das U-Boot is a device bootloader that can read its configuration from an AES encrypted file. Devices that make use of Das U-Boot's AES-CBC encryption feature using environment encryption (i.e., setting the configuration parameter CONFIG_ENV_AES=y) read environment variables from disk as the encrypted disk image is processed. An attacker with physical access to the device can manipulate the encrypted environment data to include a crafted two-byte sequence which triggers an error in environment variable parsing. This error condition is improperly handled by Das U-Boot, resulting in an immediate process termination with a debugging message.

Affected products

• Denx U-Boot: before 2017.09 (fixed in 2017.09)

Published 2018-07-24. Last modified 2026-06-17.