In Arm software implementing the Armv8-M processors (all versions), the stack selection mechanism could be influenced by a stack-underflow attack in v8-M TrustZone based processors. An attacker can cause a change to the stack pointer used by the Secure World from a non-secure application if the stack is not initialized. This vulnerability affects only the software that is based on Armv8-M processors with the Security Extension.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-16273
• https://developer.arm.com/support/arm-security-updates/armv8-m-stack-sealing