The pppol2tp_recvmsg function in drivers/net/pppol2tp.c in the Linux kernel 2.6 before 2.6.26-rc6 allows remote attackers to cause a denial of service (kernel heap memory corruption and system crash) and possibly have unspecified other impact via a crafted PPPOL2TP packet that results in a large value for a certain length variable.
https://www.redhat.com/archives/fedora-package-announce/2008-July/msg00082.html
https://issues.rpath.com/browse/RPL-2629
https://exchange.xforce.ibmcloud.com/vulnerabilities/43111
http://www.vupen.com/english/advisories/2008/1854
http://www.ubuntu.com/usn/usn-625-1
http://www.securityfocus.com/bid/29747
http://www.openwall.com/lists/oss-security/2008/06/19/3
http://www.mandriva.com/security/advisories?name=MDVSA-2008:167
http://wiki.rpath.com/wiki/Advisories:rPSA-2008-0207
http://securitytracker.com/id?1020297
http://secunia.com/advisories/31202
http://secunia.com/advisories/31107
http://secunia.com/advisories/30920
http://secunia.com/advisories/30901
http://secunia.com/advisories/30719
http://lists.opensuse.org/opensuse-security-announce/2008-07/msg00009.html
http://kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.26-rc6