Certain Arm products before 2021-08-23 do not properly consider the effect of exceptions on a VLLDM instruction. A Non-secure handler may have read or write access to part of a Secure context. This affects Arm Cortex-M33 r0p0 through r1p0, Arm Cortex-M35P r0, Arm Cortex-M55 r0p0 through r1p0, and Arm China STAR-MC1 (in the STAR SE configuration).

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-35465
• https://developer.arm.com/support/arm-security-updates
• https://developer.arm.com/support/arm-security-updates/vlldm-instruction-security-vulnerability