Systems with microprocessors utilizing speculative execution and that perform speculative reads of system registers may allow unauthorized disclosure of system parameters to an attacker with local user access via a side-channel analysis, aka Rogue System Register Read (RSRE), Variant 3a.
https://cert-portal.siemens.com/productcert/pdf/ssa-268644.pdf
https://cert-portal.siemens.com/productcert/pdf/ssa-608355.pdf
https://lists.debian.org/debian-lts-announce/2018/07/msg00038.html
https://lists.debian.org/debian-lts-announce/2018/09/msg00017.html
https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/ADV180013
https://security.netapp.com/advisory/ntap-20180521-0001/
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03850en_us
https://usn.ubuntu.com/3756-1/
https://www.debian.org/security/2018/dsa-4273
https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00115.html
https://www.kb.cert.org/vuls/id/180049
https://www.us-cert.gov/ncas/alerts/TA18-141A