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Start learningUpgrade Oracle:7 kernel-devel to version 0:3.10.0-327.el7 or higher.
This issue was patched in ELSA-2015-2152.
Note: Versions mentioned in the description apply only to the upstream kernel-devel package and not the kernel-devel package as distributed by Oracle.
See How to fix? for Oracle:7 relevant fixed versions and status.
The em_sysenter function in arch/x86/kvm/emulate.c in the Linux kernel before 3.18.5, when the guest OS lacks SYSENTER MSR initialization, allows guest OS users to gain guest OS privileges or cause a denial of service (guest OS crash) by triggering use of a 16-bit code segment for emulation of a SYSENTER instruction.