Red Hat Security Advisory 2012-0061-01 - The kernel-rt packages contain the Linux kernel, the core of any Linux operating system. This update fixes the following security issue: It was found that permissions were not checked properly in the Linux kernel when handling the /proc/[pid]/mem writing functionality. A local, unprivileged user could use this flaw to escalate their privileges. Refer to Red Hat Knowledgebase article DOC-69129, linked to in the References, for further information.
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