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.
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
Published: 2006-10-17
Base Score: 2.1
Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:P
Severity: Low