The div_long_long_rem implementation in include/asm-x86/div64.h in the Linux kernel before 2.6.26 on the x86 platform allows local users to cause a denial of service (Divide Error Fault and panic) via a clock_gettime system call.
http://www.openwall.com/lists/oss-security/2011/10/24/3
http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.26