Vulnerability CVE-2014-8481
Published: 2014-11-10

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.

See advisories in our WLB2 database:
Topic
Author
Date
Med.
Linux 3.17 guest-triggerable KVM OOPS
Andy Lutomirski
24.10.2014
Med.
Linux 3.17 guest-triggerable KVM OOPS PoC
Andy Lutomirski
24.10.2014

CVSS2 => (AV:L/AC:L/Au:N/C:N/I:N/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.9/10
6.9/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Complete
Affected software
Linux -> Linux kernel 

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