The /proc handling (proc/base.c) Linux kernel 2.4 before 2.4.17 allows local users to cause a denial of service via unknown vectors that cause an invalid access of free memory.
kernel.debian.net/debian/pool/main/kernel-source-2.4.17/kernel-source-2.4.17_2.4.17-1woody4_ia64.changes
secunia.com/advisories/20163
secunia.com/advisories/20202
secunia.com/advisories/20338
www.debian.org/security/2006/dsa-1067
www.debian.org/security/2006/dsa-1069
www.debian.org/security/2006/dsa-1070
www.debian.org/security/2006/dsa-1082
www.securityfocus.com/bid/18173