Race condition in the ia32 compatibility code for the execve system call in Linux kernel 2.4 before 2.4.31 and 2.6 before 2.6.6 allows local users to cause a denial of service (kernel panic) and possibly execute arbitrary code via a concurrent thread that increments a pointer count after the nargs function has counted the pointers, but before the count is copied from user space to kernel space, which leads to a buffer overflow.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11117
http://www.vupen.com/english/advisories/2005/1878
http://www.suresec.org/advisories/adv4.pdf
http://www.securityfocus.com/bid/14205
http://www.redhat.com/support/errata/RHSA-2005-663.html
http://www.redhat.com/support/errata/RHSA-2005-551.html
http://www.novell.com/linux/security/advisories/2005_44_kernel.html
http://www.debian.org/security/2005/dsa-921
http://securitytracker.com/id?1014442
http://secunia.com/advisories/19607
http://secunia.com/advisories/19185
http://secunia.com/advisories/18059
http://secunia.com/advisories/17002