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 to obtain sensitive register content information from another guest by…
Does this matter?
Lower severity and a low EPSS score (0.41%). Track it; it rarely justifies an emergency change on its own.
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 3.0
- 3.8 LOWCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
- EPSS
- 0.41% probability · 35th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-200, CWE-284
- Affected
- xen/xen · fedoraproject/fedora · oracle/vm server
- Source
- cve@mitre.org
References
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181699.htmlThird Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181729.htmlThird Party Advisory
- http://support.citrix.com/article/CTX209443
- http://www.debian.org/security/2016/dsa-3554
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.htmlVendor Advisory
- http://www.securityfocus.com/bid/85714Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1035435Third Party Advisory, VDB Entry
- http://xenbits.xen.org/xsa/advisory-172.htmlVendor Advisory
- http://xenbits.xen.org/xsa/xsa172-4.3.patchPatch
- http://xenbits.xen.org/xsa/xsa172.patchPatch
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181699.htmlThird Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181729.htmlThird Party Advisory
- http://support.citrix.com/article/CTX209443
- http://www.debian.org/security/2016/dsa-3554
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.htmlVendor Advisory
- http://www.securityfocus.com/bid/85714Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1035435Third Party Advisory, VDB Entry
- http://xenbits.xen.org/xsa/advisory-172.htmlVendor Advisory
- http://xenbits.xen.org/xsa/xsa172-4.3.patchPatch
- http://xenbits.xen.org/xsa/xsa172.patchPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.