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CVE-2016-4020

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Date: May 25, 2016

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).

Language: C

Severity Score

Related Resources (16)

https://security-tracker.debian.org/tracker/CVE-2016-4020
https://access.redhat.com/security/cve/CVE-2016-4020
http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=691a02e2ce0c413236a78dee6f2651c937b09fb0
https://people.canonical.com/~ubuntu-security/cve/CVE-2016-4020
https://access.redhat.com/errata/RHSA-2017:2392
https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01106.html
https://nvd.nist.gov/vuln/detail/CVE-2016-4020
http://www.ubuntu.com/usn/USN-2974-1
https://security.gentoo.org/glsa/201609-01
https://access.redhat.com/errata/RHSA-2017:1856
https://access.redhat.com/errata/RHSA-2017:2408
https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01118.html
https://bugzilla.redhat.com/show_bug.cgi?id=1313686
https://lists.debian.org/debian-lts-announce/2018/11/msg00038.html
http://www.securityfocus.com/bid/86067
https://www.mend.io/vulnerability-database/CVE-2016-4020

Severity Score

Weakness Type (CWE)

Insufficient Information

NVD-CWE-noinfo

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): NONE
Additional information:

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