The icmp_send function in net/ipv4/icmp.c in the Linux kernel before 2.6.25, when configured as a router with a REJECT route, does not properly manage the Protocol Independent Destination Cache (aka DST) in some situations involving transmission of an ICMP Host Unreachable message, which allows remote attackers to cause a denial of service (connectivity outage) by sending a large series of packets to many destination IP addresses within this REJECT route, related to an "rt_cache leak."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7867
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10215
https://exchange.xforce.ibmcloud.com/vulnerabilities/49199
http://www.vmware.com/security/advisories/VMSA-2009-0016.html
http://www.securitytracker.com/id?1021958
http://www.securityfocus.com/bid/34084
http://www.securityfocus.com/archive/1/507985/100/0/threaded
https://euvd.enisa.europa.eu/vulnerability/EUVD-2009-0778
https://bugzilla.redhat.com/show_bug.cgi?id=485163
http://www.vupen.com/english/advisories/2009/3316
http://www.redhat.com/support/errata/RHSA-2009-0326.html
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.25
http://secunia.com/advisories/37471