If two router advertisment speaker announce seperate default gateways with infinite timeout the kernel currently packs these routes together into an ecmp route set. If one of the RA speaker now changes the advertised expiration to a lower value and a third route with infinite timeout pops up we end up with a BUG_ON.
Remote attacker could use this flaw to crash the system.
Introduced in upstream version:
Red Hat would like to thank Hannes Frederic Sowa for reporting this issue.
This issue did not affect the kernel packages as shipped with Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2.
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 984668]