Linux kernel 2.6.15.1 and earlier, when running on SPARC architectures, allows local users to cause a denial of service (hang) via a "date -s" command, which causes invalid sign extended arguments to be provided to the get_compat_timespec function call.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24475
http://www.vupen.com/english/advisories/2006/0418
http://www.securityfocus.com/bid/17216
http://www.debian.org/security/2006/dsa-1017
http://secunia.com/advisories/19374
http://marc.info/?l=linux-sparc&m=113861287813463&w=2