CVE-2016-3157

Description

The __switch_to function in arch/x86/kernel/process_64.c in the Linux kernel does not properly context-switch IOPL on 64-bit PV Xen guests, which allows local guest OS users to gain privileges, cause a denial of service (guest OS crash), or obtain sensitive information by leveraging I/O port access.

Category

7.8
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.13%
Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory debian.org Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory xen.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.ubuntu.com/usn/USN-2971-2 vendor advisory
http://xenbits.xen.org/xsa/advisory-171.html patch vendor advisory
http://www.ubuntu.com/usn/USN-2970-1 vendor advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
http://www.ubuntu.com/usn/USN-2969-1 vendor advisory
http://www.ubuntu.com/usn/USN-2968-1 vendor advisory
http://www.ubuntu.com/usn/USN-2971-3 vendor advisory
http://www.ubuntu.com/usn/USN-2997-1 vendor advisory
http://www.debian.org/security/2016/dsa-3607 vendor advisory
http://www.ubuntu.com/usn/USN-2971-1 vendor advisory
http://www.ubuntu.com/usn/USN-2996-1 vendor advisory
http://www.ubuntu.com/usn/USN-2968-2 vendor advisory
http://www.securitytracker.com/id/1035308 vdb entry
http://www.securityfocus.com/bid/84594 vdb entry

Frequently Asked Questions

What is the severity of CVE-2016-3157?
CVE-2016-3157 has been scored as a high severity vulnerability.
How to fix CVE-2016-3157?
To fix CVE-2016-3157, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-3157 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2016-3157 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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