CVE-2021-41612: Openrisc MOR1KX Firmware

High severity, CVSS 8.8. EPSS: 1.1% chance of exploitation in the next 30 days.

An issue was discovered in the ALU unit of the OpenRISC mor1kx processor. The carry flag is not being updated correctly for the subtract instruction, which results in an incorrect value of the carry flag. Any software that relies on this flag may experience corruption in execution.

Affected products

• Openrisc MOR1KX Firmware: before 5.1 (fixed in 5.1)

Published 2023-04-18. Last modified 2026-06-17.