Arm Armv8-A core implementations utilizing speculative execution past unconditional changes in control flow may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis, aka "straight-line speculation."

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-13844
• https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability
• https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability/downloads/straight-line-speculation
• https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability/frequently-asked-questions
• https://gcc.gnu.org/pipermail/gcc-patches/2020-June/547520.html
• http://lists.llvm.org/pipermail/llvm-dev/2020-June/142109.html
• http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00039.html
• http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00040.html