Buffer overflow in sysctl in the Linux Kernel 2.6 before 2.6.15 allows local users to corrupt user memory and possibly cause a denial of service via a long string, which causes sysctl to write a zero byte outside the buffer. NOTE: since the sysctl is called from a userland program that provides the argument, this might not be a vulnerability, unless a legitimate user-assisted or setuid scenario can be identified.
http://www.vupen.com/english/advisories/2006/0035
http://www.securityfocus.com/bid/16141
http://www.mandriva.com/security/advisories?name=MDKSA-2006:040
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.15
http://www.debian.org/security/2006/dsa-1018
http://www.debian.org/security/2006/dsa-1017
http://secunia.com/advisories/19374
http://secunia.com/advisories/19369
http://secunia.com/advisories/18527