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A flaw was found in the implementation of SGX around the access control of protected memory. A local attacker of a system with SGX enabled and an affected intel GPU with the ability to execute code is able to infer the contents of the SGX protected memory.
Acknowledgements: Red Hat thanks Intel for reporting this issue and collaborating on the mitigations.
Statement: Red Hat Product Security is aware of this issue. Updates will be released as they become available. For additional information, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/solutions/2019-microcode-nov
Mitigation: As of this time there are no known mitigations. Please install relevant updated packages to address this flaw.
Created microcode_ctl tracking bugs for this issue: Affects: fedora-all [bug 1771648]
External References: https://access.redhat.com/solutions/2019-microcode-nov https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00219.html