CVE-2016-3158
xen - security update
3.8
LOW
CVSS 3.1
EPSS 0.04%
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.
How to fix CVE-2016-3158
To remediate CVE-2016-3158, upgrade the affected package to a fixed version below.
- —upgrade to 4.8.0~rc3-1 or later
- —upgrade to 4.4.1-9+deb8u5 or later
Is CVE-2016-3158 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 4.8.0~rc3-1
- from 0, < 4.4.1-9+deb8u5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW3.8 | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N |