IBPB may not prevent return branch predictions from being specified by pre-IBPB branch targets leading to a potential information disclosure.
This issue (CVE-2022-23824 or AMD-SN-1040) related to CVE-2017-5715 previously known as Spectre Variant 2. As part of our efforts to continue improving security features, AMD has investigated issues related to CVE-2017-5715 in the recent months. Previously notified of one of the potential issues related to CVE-2017-5715 (in AMD-SN-1036). In some situations, IBPB may fail to prevent return branch predictions from being specified by pre-IBPB branch targets leading to potential information disclosure.
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 2141263]