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Carl, could you please have a look? We will not be fixing this one in Fedora.
I looked into this a bit, and I see that it's not exploitable on a fully patched RHEL/CentOS 7 due to glibc already being patched for CVE-2016-10739.
I'm not opposed to patching this in the EPEL 6 package, but I'm not sure where to start. I found this upstream bug, but it doesn't reference a commit or pull request fixing the flaw in other branches.
Got any pointers of where to start writing a patch to fix this?
There is no upstream fix for this issue yet, as it is mainly visible on systems where CVE-2016-10739 is not already patched (e.g. some versions of RHEL 7 and maybe some other distros that ship an old glibc version).