The xen_iret function in arch/x86/xen/xen-asm_32.S in the Linux kernel before 3.7.9 on 32-bit Xen paravirt_ops platforms does not properly handle an invalid value in the DS segment register, which allows guest OS users to gain guest OS privileges via a crafted application.
Exploitability
AV:LAC:HAu:NImpact
C:CI:CA:C6.2/AV:L/AC:H/Au:N/C:C/I:C/A:C