A spokesperson for the National Cyber Security Centre said:
“We are aware of reports about a potential flaw affecting some computer processors.
“At this stage there is no evidence of any malicious exploitation and patches are being produced for the major platforms.
“The NCSC advises that all organisations and home users continue to protect their systems from threats by installing patches as soon as they become available.”
Guidance for enterprise administrators can be read here with guidance also available for home users here.