The IPv6 implementation in the Linux kernel before 3.1 does not generate Fragment Identification values separately for each destination, which makes it easier for remote attackers to cause a denial of service (disrupted networking) by predicting these values and sending crafted packets.
git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=87c48fa3b4630905f98268dde838ee43626a060c
www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.1
www.mandriva.com/security/advisories?name=MDVSA-2013:150
www.openwall.com/lists/oss-security/2011/07/20/5
www.securitytracker.com/id?1027274
bugzilla.redhat.com/show_bug.cgi?id=723429
github.com/torvalds/linux/commit/87c48fa3b4630905f98268dde838ee43626a060c