A CVE has been assigned for a security issues fixed upstream in openssh: http://openwall.com/lists/oss-security/2016/10/19/9 I believe this is the patch they were referring to to fix it: http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126&r2=1.127 Mageia 5 may also be affected.
Fixed in Cauldron by Guillaume. Code in Mageia 5 is different enough that it isn't obvious that it's affected. Will re-open if we find out otherwise.
Status: NEW => RESOLVEDResolution: (none) => FIXED