Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Oracle | Vm Server | 3.2 |
| Xen | Xen | <= 4.6.1 |
Related Weaknesses (CWE)
References
- http://www.debian.org/security/2016/dsa-3633
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.htmVendor Advisory
- http://www.securityfocus.com/bid/90710
- http://www.securitytracker.com/id/1035901
- http://xenbits.xen.org/xsa/advisory-176.htmlVendor Advisory
- http://www.debian.org/security/2016/dsa-3633
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.htmVendor Advisory
- http://www.securityfocus.com/bid/90710
- http://www.securitytracker.com/id/1035901
- http://xenbits.xen.org/xsa/advisory-176.htmlVendor Advisory
FAQ
What is CVE-2016-4480?
CVE-2016-4480 is a vulnerability with a CVSS score of 8.4 (HIGH). 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 all...
How severe is CVE-2016-4480?
CVE-2016-4480 has been rated HIGH with a CVSS base score of 8.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2016-4480?
Check the references section above for vendor advisories and patch information. Affected products include: Oracle Vm Server, Xen Xen.