CVE-2016-4480

Description

The guest_walk_tables function in arch/x86/mm/guest_walk.c in Xen 4.6.x and earlier does not properly handle the Page Size (PS) page table entry bit at the L4 and L3 page table levels, which might allow local guest OS users to gain privileges via a crafted mapping of memory.

Category

8.4
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.15%
Vendor Advisory debian.org Vendor Advisory oracle.com Vendor Advisory xen.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html vendor advisory
http://www.securityfocus.com/bid/90710 vdb entry
http://www.securitytracker.com/id/1035901 vdb entry
http://www.debian.org/security/2016/dsa-3633 vendor advisory
http://xenbits.xen.org/xsa/advisory-176.html vendor advisory

Frequently Asked Questions

What is the severity of CVE-2016-4480?
CVE-2016-4480 has been scored as a high severity vulnerability.
How to fix CVE-2016-4480?
To fix CVE-2016-4480, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-4480 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2016-4480 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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