The (1) sparc_mmap_check function in arch/sparc/kernel/sys_sparc.c and the (2) sparc64_mmap_check function in arch/sparc64/kernel/sys_sparc.c, in the Linux kernel 2.4 before 2.4.36.5 and 2.6 before 2.6.25.3, omit some virtual-address range (aka span) checks when the mmap MAP_FIXED bit is not set, which allows local users to cause a denial of service (panic) via unspecified mmap calls.
https://exchange.xforce.ibmcloud.com/vulnerabilities/42681
http://www.vupen.com/english/advisories/2008/1716/references
http://www.ubuntu.com/usn/usn-625-1
http://www.securitytracker.com/id?1020119
http://www.securityfocus.com/bid/29397
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.25.3
http://www.kernel.org/pub/linux/kernel/v2.4/ChangeLog-2.4.36.5
http://www.debian.org/security/2008/dsa-1588
http://secunia.com/advisories/31107