A security issue was identified and fixed in dhcp: ISC DHCP 4.1.x before 4.1-ESV-R7 and 4.2.x before 4.2.4-P2 allows remote attackers to cause a denial of service in opportunistic circumstances by establishing an IPv6 lease in an environment where the lease expiration time is later reduced . The updated packages have been patched to correct this issue. Update: Packages for Mandriva Linux 2011 is being provided. The updated packages have been upgraded to dhcp 4.2.4-P2 which is not vulnerable to this issue.