CVE-2014-8481 Information

Description

The instruction decoder in arch/x86/kvm/emulate.c in the KVM subsystem in the Linux kernel before 3.18-rc2 does not properly handle invalid instructions which allows guest OS users to cause a denial of service (NULL pointer dereference and host OS crash) via a crafted application that triggers (1) an improperly fetched instruction or (2) an instruction that occupies too many bytes. NOTE: this vulnerability exists because of an incomplete fix for CVE-2014-8480.

Reference

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=a430c9166312e1aa3d80bce32374233bdbfeba32 http://secunia.com/advisories/62042 http://thread.gmane.org/gmane.comp.emulators.kvm.devel/128427 http://www.openwall.com/lists/oss-security/2014/10/23/7 https://bugzilla.redhat.com/show_bug.cgi?id=1156615 https://github.com/torvalds/linux/commit/a430c9166312e1aa3d80bce32374233bdbfeba32