Red Hat Security Advisory 2013-0622-01 - The kernel-rt packages contain the Linux kernel, the core of any Linux operating system. A flaw was found in the way file permission checks for the "/dev/cpu/[x]/msr" files were performed in restricted root environments. A local user with the ability to write to these files could use this flaw to escalate their privileges to kernel level, for example, by writing to the SYSENTER_EIP_MSR register.
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