High severity · published May 18, 2016
CVE-2016-4480
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…
8.4
CVSS
0.5%
EPSS
No
On KEV
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 vector
CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VS
VM Server · Oracle
3.2; 3.3; 3.4 · source: NVD
XE
Xen · Xen
through 4.6.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2016-4480
CVE.org
https://www.cve.org/CVERecord?id=CVE-2016-4480
www.debian.org
http://www.debian.org/security/2016/dsa-3633
Vendor Advisory
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
www.securityfocus.com
http://www.securityfocus.com/bid/90710
www.securitytracker.com
http://www.securitytracker.com/id/1035901
Vendor Advisory
http://xenbits.xen.org/xsa/advisory-176.html
More from VM Server
7.5
CVE-2015-5477
ISC BIND Data Processing Errors Vulnerability
9.8
CVE-2016-4448
Format string vulnerability in libxml2 before 2.9.4 allows attackers to have unspecified impact via format string specifiers in unknown vectors
9.8
CVE-2015-8668
Heap-based buffer overflow in the PackBitsPreEncode function in tif_packbits.c in bmp2tiff in libtiff 4.0.6 and earlier allows remote attackers to execute arbitrary code or cause…
8.8
CVE-2016-3710
The VGA module in QEMU improperly performs bounds checking on banked access to video memory, which allows local guest OS administrators to execute arbitrary code on the host by…
8.8
CVE-2016-3960
Integer overflow in the x86 shadow pagetable code in Xen allows local guest OS users to cause a denial of service (host crash) or possibly gain privileges by shadowing a superpage…