CVE-2014-8481

MEDIUM

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.

References

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

Details

Source: MITRE

Published: 2014-11-10

Updated: 2015-11-20

Type: CWE-399

Risk Information

CVSS v2.0

Base Score: 4.9

Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C

Impact Score: 6.9

Exploitability Score: 3.9

Severity: MEDIUM