CVE-2006-5173 Information

Description

Linux kernel does not properly save or restore EFLAGS during a context switch or reset the flags when creating new threads which allows local users to cause a denial of service (process crash) as demonstrated using a process that sets the Alignment Check flag (EFLAGS 0x40000) which triggers a SIGBUS in other processes that have an unaligned access.

Reference

http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=47a5c6fa0e204a2b63309c648bb2fde36836c826 http://secunia.com/advisories/23361 http://secunia.com/advisories/23384 http://secunia.com/advisories/23474 http://secunia.com/advisories/23593 http://secunia.com/advisories/25691 http://www.mandriva.com/security/advisories?name=MDKSA-2007:002 http://www.novell.com/linux/security/advisories/2006_79_kernel.html http://www.securityfocus.com/archive/1/471457 http://www.securityfocus.com/bid/21851 http://www.ubuntu.com/usn/usn-395-1