Details of CVE-2012-4398

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Issue

Please tell us the detail about CVE-2012-4398. What kind of attack can be expected from this vulnerability, and what is the effect of this attack?
Is there any workaround to avoid this vulnerability? Please share it if it exists.
When and which z-stream errata will be released for RHEL5?

Environment

Red Hat Enterprise Linux 5 Update 6
Architecture: x86
Kernel Version: 2.6.18-238.el5

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