Low severity · published Apr 13, 2016
CVE-2016-3158
The xrstor function in arch/x86/xstate.c in Xen 4.x does not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors, which allows local guest OS users…
3.8
CVSS
0.4%
EPSS
No
On KEV
Description
The xrstor function in arch/x86/xstate.c in Xen 4.x does not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors, which allows local guest OS users to obtain sensitive register content information from another guest by leveraging pending exception and mask bits. NOTE: this vulnerability exists because of an incorrect fix for CVE-2013-2076.
CVSS vector
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FE
Fedora · Fedoraproject
22; 23 · source: NVD
VS
VM Server · Oracle
3.3; 3.4 · source: NVD
XE
Xen · Xen
through 4.4.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2016-3158
CVE.org
https://www.cve.org/CVERecord?id=CVE-2016-3158
Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181699.html
Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181729.html
support.citrix.com
http://support.citrix.com/article/CTX209443
www.debian.org
http://www.debian.org/security/2016/dsa-3554
Vendor Advisory
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
Third Party Advisory
http://www.securityfocus.com/bid/85714
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