CVE-2016-4020

Description

The patch_instruction function in hw/i386/kvmvapic.c in QEMU does not initialize the imm32 variable, which allows local guest OS administrators to obtain sensitive information from host stack memory by accessing the Task Priority Register (TPR).

6.5

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.08%

Vendor Advisory redhat.com Vendor Advisory gentoo.org Vendor Advisory ubuntu.com Vendor Advisory redhat.com Vendor Advisory redhat.com

Affected: n/a n/a

References

Link	Tags
http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=691a02e2ce0c413236a78dee6f2651c937b09fb0
https://bugzilla.redhat.com/show_bug.cgi?id=1313686	third party advisory issue tracking
https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01106.html	patch mailing list third party advisory
http://www.securityfocus.com/bid/86067	third party advisory vdb entry
https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01118.html	patch mailing list third party advisory
https://access.redhat.com/errata/RHSA-2017:2392	third party advisory vendor advisory
https://security.gentoo.org/glsa/201609-01	third party advisory vendor advisory
http://www.ubuntu.com/usn/USN-2974-1	third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2018/11/msg00038.html	third party advisory mailing list
https://access.redhat.com/errata/RHSA-2017:2408	third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2017:1856	third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2016-4020?: CVE-2016-4020 has been scored as a medium severity vulnerability.
How to fix CVE-2016-4020?: To fix CVE-2016-4020, 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-2016-4020 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2016-4020 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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