The sysctl functionality (sysctl.c) in Linux kernel before 2.6.14.1 allows local users to cause a denial of service (kernel oops) and possibly execute code by opening an interface file in /proc/sys/net/ipv4/conf/, waiting until the interface is unregistered, then obtaining and modifying function pointers in memory that was used for the ctl_table.
secunia.com/advisories/17504
secunia.com/advisories/17541
secunia.com/advisories/17648
secunia.com/advisories/18510
secunia.com/advisories/18562
secunia.com/advisories/18684
secunia.com/advisories/19369
secunia.com/advisories/19374
securitytracker.com/id?1015434
www.debian.org/security/2006/dsa-1017
www.debian.org/security/2006/dsa-1018
www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.14.1
www.mandriva.com/security/advisories?name=MDKSA-2006:059
www.osvdb.org/20676
www.redhat.com/support/errata/RHSA-2006-0101.html
www.redhat.com/support/errata/RHSA-2006-0140.html
www.redhat.com/support/errata/RHSA-2006-0190.html
www.redhat.com/support/errata/RHSA-2006-0191.html
www.securityfocus.com/archive/1/427980/100/0/threaded
www.securityfocus.com/archive/1/427981/100/0/threaded
www.securityfocus.com/archive/1/428028/100/0/threaded
www.securityfocus.com/archive/1/428058/100/0/threaded
www.securityfocus.com/bid/15365
www.vupen.com/english/advisories/2005/2359
exchange.xforce.ibmcloud.com/vulnerabilities/23040
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10746
usn.ubuntu.com/219-1/