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Test your applicationsUpgrade SLES:15.3 kernel-source to version 5.3.18-150300.59.54.1 or higher.
Note: Versions mentioned in the description apply only to the upstream kernel-source package and not the kernel-source package as distributed by SLES.
See How to fix? for SLES:15.3 relevant fixed versions and status.
Non-transparent sharing of branch predictor selectors between contexts in some Intel(R) Processors may allow an authorized user to potentially enable information disclosure via local access.