Medium severity · published Aug 2, 2016
CVE-2016-6259
Xen 4.5.x through 4.7.x do not implement Supervisor Mode Access Prevention (SMAP) whitelisting in 32-bit exception and event delivery, which allows local 32-bit PV guest OS…
6.2
CVSS
0.6%
EPSS
No
On KEV
Description
Xen 4.5.x through 4.7.x do not implement Supervisor Mode Access Prevention (SMAP) whitelisting in 32-bit exception and event delivery, which allows local 32-bit PV guest OS kernels to cause a denial of service (hypervisor and VM crash) by triggering a safety check.
CVSS vector
CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 50% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
XE
Xen · Xen
4.5.0; 4.5.1; 4.5.2; 4.5.3; 4.6.0; 4.6.1; +2 more · source: NVD
XE
Xenserver · Citrix
6.0; 6.0.2; 6.1; 6.2.0; 6.5.0; 7.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2016-6259
CVE.org
https://www.cve.org/CVERecord?id=CVE-2016-6259
Vendor Advisory
http://support.citrix.com/article/CTX214954
Third Party Advisory
http://www.securityfocus.com/bid/92130
Third Party Advisory
http://www.securitytracker.com/id/1036447
Mailing List
http://xenbits.xen.org/xsa/advisory-183.html
Mitigation
http://xenbits.xen.org/xsa/xsa183-4.6.patch
Mitigation
http://xenbits.xen.org/xsa/xsa183-unstable.patch
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