CVE-2016-4020

moderate-risk
Published 2016-05-25

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).

Do I need to act?

-
0.08% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10 Medium
LOCAL / LOW complexity

Affected Products (20)

Affected Vendors

Debian Qemu Canonical Redhat

References (22)

http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=691a02e2ce0c413236a78dee6f2651c93...
Third Party Advisory http://www.securityfocus.com/bid/86067
Third Party Advisory http://www.ubuntu.com/usn/USN-2974-1
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:1856
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:2392
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:2408
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1313686
Mailing List https://lists.debian.org/debian-lts-announce/2018/11/msg00038.html
Patch https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01106.html
Patch https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01118.html
Third Party Advisory https://security.gentoo.org/glsa/201609-01
http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=691a02e2ce0c413236a78dee6f2651c93...
Third Party Advisory http://www.securityfocus.com/bid/86067
Third Party Advisory http://www.ubuntu.com/usn/USN-2974-1
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:1856
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:2392
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:2408
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1313686
Mailing List https://lists.debian.org/debian-lts-announce/2018/11/msg00038.html
Patch https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01106.html
and 2 more references
42
/ 100
moderate-risk
Severity 21/34 · High
Exploitability 0/34 · Minimal
Exposure 21/34 · High