CVE-2016-4480

Severity: high (CVSS 8.4 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-05-18 · updated 2026-06-17
Weakness: CWE-264

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.

Affected products

Oracle Vm Server: 3.2, 3.3, 3.4
xen: through 4.6.1

References

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

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